⚠️ Warning: This is a draft ⚠️

This means it might contain formatting issues, incorrect code, conceptual problems, or other severe issues.

If you want to help to improve and eventually enable this page, please fork RosettaGit's repository and open a merge request on GitHub.

[[wp:Bulls and Cows|Bulls and Cows]] is an old game played with pencil and paper that was later implemented using computers.

;Task: Create a four digit random number from the digits '''1''' to '''9''', without duplication.

The program should: ::::::* ask for guesses to this number ::::::* reject guesses that are malformed ::::::* print the score for the guess

The score is computed as:

# A score of one '''cow''' is accumulated for each digit in the guess that also appears in the randomly chosen number, but in the wrong position.

• [[Bulls and cows/Player]]
• [[Guess the number]]
• [[Guess the number/With Feedback]]
• [[Mastermind]]

with Ada.Text_IO;  use Ada.Text_IO;

procedure Bulls_And_Cows is
package Random_Natural is new Ada.Numerics.Discrete_Random (Natural);
Number : String (1..4);
begin
declare -- Generation of number
use Random_Natural;
Digit    : String   := "123456789";
Size     : Positive := 9;
Dice     : Generator;
Position : Natural;
begin
Reset (Dice);
for I in Number'Range loop
Position := Random (Dice) mod Size + 1;
Number (I) := Digit (Position);
Digit (Position..Size - 1) := Digit (Position + 1..Size);
Size := Size - 1;
end loop;
end;
loop -- Guessing loop
Put ("Enter four digits:");
declare
Guess : String  := Get_Line;
Bulls : Natural := 0;
Cows  : Natural := 0;
begin
if Guess'Length /= 4 then
raise Data_Error;
end if;
for I in Guess'Range loop
for J in Number'Range loop
if Guess (I) not in '1'..'9' or else (I < J and then Guess (I) = Guess (J)) then
raise Data_Error;
end if;
if Number (I) = Guess (J) then
if I = J then
Bulls := Bulls + 1;
else
Cows := Cows + 1;
end if;
end if;
end loop;
end loop;
exit when Bulls = 4;
Put_Line (Integer'Image (Bulls) & " bulls," & Integer'Image (Cows) & " cows");
exception
when Data_Error => Put_Line ("You should enter four different digits 1..9");
end;
end loop;
end Bulls_And_Cows;


## ALGOL 68

{{trans|Python}}

{{works with|ALGOL 68|Revision 1 - no extensions to language used}}

{{works with|ELLA ALGOL 68|Any (with appropriate job cards) - tested with release [http://sourceforge.net/projects/algol68/files/algol68toc/algol68toc-1.8.8d/algol68toc-1.8-8d.fc9.i386.rpm/download 1.8-8d]}}

STRING digits = "123456789";

CHAR chosen;
STRING available := digits;
FOR i TO UPB chosen DO
INT c = ENTIER(random*UPB available)+1;
chosen[i] := available[c];
available := available[:c-1]+available[c+1:]
OD;

COMMENT print((chosen, new line)); # Debug # END COMMENT

OP D = (INT d)STRING: whole(d,0); # for formatting an integer #

print (("I have chosen a number from ",D UPB chosen," unique digits from 1 to 9 arranged in a random order.", new line,
"You need to input a ",D UPB chosen," digit, unique digit number as a guess at what I have chosen", new line));

PRIO WITHIN = 5, NOTWITHIN = 5;
OP WITHIN = (CHAR c, []CHAR s)BOOL: char in string(c,LOC INT,s);
OP NOTWITHIN = (CHAR c, []CHAR s)BOOL: NOT ( c WITHIN s );

INT guesses := 0, bulls, cows;
WHILE
STRING guess;
guesses +:= 1;
WHILE
# get a good guess #
print((new line,"Next guess [",D guesses,"]: "));
IF UPB guess NE UPB chosen THEN
FALSE
ELSE
BOOL ok;
FOR i TO UPB guess WHILE
ok := guess[i] WITHIN digits AND guess[i] NOTWITHIN guess[i+1:]
DO SKIP OD;
NOT ok
FI
DO
print(("Problem, try again. You need to enter ",D UPB chosen," unique digits from 1 to 9", new line))
OD;
# WHILE #
guess NE chosen
DO
bulls := cows := 0;
FOR i TO UPB chosen DO
IF guess[i] = chosen[i] THEN
bulls +:= 1
ELIF guess[i] WITHIN chosen THEN
cows +:= 1
FI
OD;
print(("  ",D bulls," Bulls",new line,"  ",D cows," Cows"))
OD;
print((new line, "Congratulations you guessed correctly in ",D guesses," attempts.",new line))


Output:


I have chosen a number from 4 unique digits from 1 to 9 arranged in a random order.
You need to input a 4 digit, unique digit number as a guess at what I have chosen

Next guess :



## AppleScript

GUI implementation; the prompt for a guess includes a list of all past guesses and their scores.

on pickNumber()
set theNumber to ""
repeat 4 times
set theDigit to (random number from 1 to 9) as string
repeat while (offset of theDigit in theNumber) > 0
set theDigit to (random number from 1 to 9) as string
end repeat
set theNumber to theNumber & theDigit
end repeat
end pickNumber

to bulls of theGuess given key:theKey
set bullCount to 0
repeat with theIndex from 1 to 4
if text theIndex of theGuess = text theIndex of theKey then
set bullCount to bullCount + 1
end if
end repeat
return bullCount
end bulls

to cows of theGuess given key:theKey, bulls:bullCount
set cowCount to -bullCount
repeat with theIndex from 1 to 4
if (offset of (text theIndex of theKey) in theGuess) > 0 then
set cowCount to cowCount + 1
end if
end repeat

return cowCount
end cows

to score of theGuess given key:theKey
set bullCount to bulls of theGuess given key:theKey
set cowCount to cows of theGuess given key:theKey, bulls:bullCount
return {bulls:bullCount, cows:cowCount}
end score

on run
set theNumber to pickNumber()
set pastGuesses to {}
repeat
set theMessage to ""
repeat with aGuess in pastGuesses
set {theGuess, theResult} to aGuess
set theMessage to theMessage & theGuess & ":" & bulls of theResult & "B, " & cows of theResult & "C" & linefeed
end repeat
set theMessage to theMessage & linefeed & "Enter guess:"
set theGuess to text returned of (display dialog theMessage with title "Bulls and Cows" default answer "")
set theScore to score of theGuess given key:theNumber
if bulls of theScore is 4 then
display dialog "Correct!  Found the secret in " & ((length of pastGuesses) + 1) & " guesses!"
exit repeat
else
set end of pastGuesses to {theGuess, theScore}
end if
end repeat
end run


## AutoHotkey

length:=4, Code:="" ; settings

While StrLen(Code) < length {
Random, num, 1, 9
If !InStr(Code, num)
Code .= num
}
Gui, Add, Text, w83 vInfo, I'm thinking of a %length%-digit number with no duplicate digits.
Gui, Add, Edit, wp vGuess, Enter a guess...
Gui, Add, Button, wp Default vDefault, Submit
Gui, Show
Return

ButtonSubmit:
If Default = Restart
Gui, Submit, NoHide
If (StrLen(Guess) != length)
GuiControl, , Info, Enter a %length%-digit number.
Else If Guess is not digit
GuiControl, , Info, Enter a %length%-digit number.
Else
{
GuiControl, , Info
GuiControl, , Guess
If (Guess = Code)
{
GuiControl, , Info, Correct!
GuiControl, , Default, Restart
Default = Restart
}
response := Response(Guess, Code)
Bulls := SubStr(response, 1, InStr(response,",")-1)
Cows := SubStr(response, InStr(response,",")+1)
GuiControl, , History, % History . Guess ": " Bulls " Bulls " Cows " Cowsn"
}
Return

GuiEscape:
GuiClose:
ExitApp

Response(Guess,Code) {
Bulls := 0, Cows := 0
Loop, % StrLen(Code)
If (SubStr(Guess, A_Index, 1) = SubStr(Code, A_Index, 1))
Bulls++
Else If (InStr(Code, SubStr(Guess, A_Index, 1)))
Cows++
Return Bulls "," Cows
}


## AWK

# Usage: GAWK -f BULLS_AND_COWS.AWK
BEGIN {
srand()
secret = ""
for (i = 1; i <= 4; ) {
digit = int(9 * rand()) + 1
if (index(secret, digit) == 0) {
secret = secret digit
i++
}
}
print "Welcome to 'Bulls and Cows'!"
print "I thought of a 4-digit number."
}
iswellformed($0) { if (calcscore($0, secret)) {
exit
}
}
function iswellformed(number,    i, digit) {
if (number !~ /[1-9][1-9][1-9][1-9]/) {
print "Your guess should contain 4 digits, each from 1 to 9. Try again!"
return 0
}
for (i = 1; i <= 3; i++) {
digit = substr(number, 1, 1)
number = substr(number, 2)
if (index(number, digit) != 0) {
print "Your guess contains a digit twice. Try again!"
return 0
}
}
return 1
}
function calcscore(guess, secret,    bulls, cows, i, idx) {
# Bulls = correct digits at the right position
# Cows = correct digits at the wrong position
for (i = 1; i <= 4; i++) {
idx = index(secret, substr(guess, i, 1))
if (idx == i) {
bulls++
} else if (idx > 0) {
cows++
}
}
printf("Your score for this guess: Bulls = %d, Cows = %d.", bulls, cows)
if (bulls < 4) {
printf(" Try again!\n")
} else {
printf("\nCongratulations, you win!\n")
}
return bulls == 4
}


{{out}}


Welcome to 'Bulls and Cows'!
I thought of a 4-digit number.
1234
Your score for this guess: Bulls = 0, Cows = 1. Try again!
5678
Your score for this guess: Bulls = 1, Cows = 1. Try again!
9651
Your score for this guess: Bulls = 1, Cows = 1. Try again!
5729
Your score for this guess: Bulls = 0, Cows = 3. Try again!
2695
Your score for this guess: Bulls = 2, Cows = 1. Try again!
2697
Your score for this guess: Bulls = 2, Cows = 2. Try again!
7692
Your score for this guess: Bulls = 4, Cows = 0.
Congratulations, you win!



## BASIC

{{works with|QBasic}}

DEFINT A-Z

DIM secret AS STRING
DIM guess  AS STRING
DIM c      AS STRING
DIM bulls, cows, guesses, i

RANDOMIZE TIMER
DO WHILE LEN(secret) < 4
c = CHR$(INT(RND * 10) + 48) IF INSTR(secret, c) = 0 THEN secret = secret + c LOOP guesses = 0 DO INPUT "Guess a 4-digit number with no duplicate digits: "; guess guess = LTRIM$(RTRIM$(guess)) IF LEN(guess) = 0 THEN EXIT DO IF LEN(guess) <> 4 OR VAL(guess) = 0 THEN PRINT "** You should enter 4 numeric digits!" GOTO looper END IF bulls = 0: cows = 0: guesses = guesses + 1 FOR i = 1 TO 4 c = MID$(secret, i, 1)
IF MID$(guess, i, 1) = c THEN bulls = bulls + 1 ELSEIF INSTR(guess, c) THEN cows = cows + 1 END IF NEXT i PRINT bulls; " bulls, "; cows; " cows" IF guess = secret THEN PRINT "You won after "; guesses; " guesses!" EXIT DO END IF looper: LOOP  = ## Applesoft BASIC = 100 D$ = "123456789"
110 FOR I = 1 TO 4
120    P = INT(RND(1) * LEN(D$)) + 1 130 N$ = N$+ MID$(D$, P, 1) 140 D$ = MID$(D$, 1, P - 1) + MID$(D$, P + 1, 8)
150 NEXT
160 PRINT "A RANDOM NUMBER HAS BEEN CREATED.
170 PRINT "THE NUMBER HAS FOUR DIGITS FROM 1 TO 9, WITHOUT DUPLICATION."
200 FOR Q = 0 TO 1 STEP 0
210     INPUT "GUESS THE NUMBER: "; G%
220     G$= STR$(G%)
230     M = LEN(G$) <> 4 OR G% = 0 240 IF NOT M THEN FOR I = 2 TO 4 : M = MID$(G$, I, 1) = "0" : IF NOT M THEN NEXT I 250 IF NOT M THEN FOR I = 1 TO 3 : FOR J = I + 1 TO 4 : M = MID$(G$, I, 1) = MID$(G$, J, 1) : IF NOT M THEN NEXT J, I 260 IF M THEN PRINT "THE GUESS IS MALFORMED." : NEXT Q 270 B = 0 280 C = 0 300 FOR I = 1 TO 4 310 C$ = MID$(N$, I, 1)
320         BULL = MID$(G$, I, 1) = C$330 COW = 0 340 IF NOT BULL THEN FOR J = 1 TO 4 : COW = MID$(G$, J, 1) = C$ : IF NOT COW THEN NEXT J
350         B = B + BULL
360         C = C + COW
370     NEXT I
380     PRINT B " BULLS, " C " COWS"
390     Q = G$= N$
400 NEXT Q


=

## Commodore BASIC

=

Based on the AppleSoft BASIC version. Modifications as follows:

• Accommodate 80 character BASIC line length (for line 250 especially), created subroutines.
• Booleans in Commodore BASIC evaluate to -1 for TRUE, therefore ABS function added to give desired results.
• Leading space in printed numbers (which is placeholder for negative sign) is included in string conversion in Commodore BASIC, therefore RIGHT$function added on 220 to trim leading whitespace upon conversion. • Other formatting (clear screen, etc.) unique to Commodore BASIC. 100 D$="123456789"
110 FOR I=1 TO 4
120 P=INT(RND(1)*LEN(D$))+1 130 N$=N$+MID$(D$,P,1) 140 D$=MID$(D$,1,P - 1)+MID$(D$,P+1,8)
150 NEXT
160 PRINT CHR$(147);"A RANDOM NUMBER HAS BEEN CREATED." 170 PRINT "THE NUMBER HAS FOUR DIGITS FROM 1 TO 9, WITHOUT DUPLICATION." 200 FOR Q=0 TO 1 STEP 0 210 INPUT "GUESS THE NUMBER: "; G% 219 REM CONVERT TO STRING AND TRIM LEADING SPACE 220 G$=RIGHT$(STR$(G%),4)
230 M=LEN(G$)<>4 OR G%=0 240 IF NOT M THEN GOSUB 600 250 IF NOT M THEN GOSUB 700 260 IF M THEN PRINT "THE GUESS IS MALFORMED.":NEXT Q 270 B=0 280 C=0 300 FOR I=1 TO 4 310 C$=MID$(N$,I,1)
320 BULL=MID$(G$,I,1)=C$330 COW=0 340 IF NOT BULL THEN FOR J=1 TO 4:COW=MID$(G$,J,1)=C$:IF NOT COW THEN NEXT J
350 B=B+ABS(BULL)
360 C=C+ABS(COW)
370 NEXT I
380 PRINT "BULLS:";B:PRINT "COWS:";C
390 Q=ABS(G$=N$)
400 NEXT Q
500 PRINT "GOOD JOB!":END
600 FOR I=2 TO 4:M=MID$(G$,I,1)="0"
610 IF NOT M THEN NEXT I
620 RETURN
700 FOR I=1 TO 3
710 FOR J=I+1 TO 4
720 M=MID$(G$,I,1)=MID$(G$,J,1)
730 IF NOT M THEN NEXT J,I
740 RETURN



## Batch File


::
::Bulls and Cows Task from Rosetta Code Wiki
::Batch File Implementation
::
::Directly OPEN the Batch File to play...
::

@echo off
title Bulls and Cows Game
setlocal enabledelayedexpansion

::GENERATING THE CODE TO BE GUESSED BY PLAYER...
:begin
set list=123456789
set cnt=1
set code=
set tries=0
:gen
set /a mod=10-%cnt%
set /a rnd=%random%%%%mod%
set pick=!list:~%rnd%,1!
set code=%code%%pick%
set list=!list:%pick%=!
if %cnt%==4 (
set c1=%code:~0,1%&set c2=%code:~1,1%&set c3=%code:~2,1%&set c4=%code:~3,1%
goto :start
)
set /a cnt+=1
goto :gen
::/GENERATING THE CODE TO BE GUESSED BY PLAYER...

::GAME DISPLAY
:start
cls
echo.
echo Bulls and Cows Game
echo Batch File Implementation
echo.
echo NOTE: Please MAXIMIZE this command window.
echo.
echo Gameplay:
echo.
echo I have generated a 4-digit code from digit 1-9 WITHOUT duplication.
echo Your objective is to guess it. If your guess is equal to my code,
echo then you WIN. If not, I will score your guess:
echo.
echo ** A score of one BULL is accumulated for each digit that equals
echo the CORRESPONDING digit in my code.
echo.
echo ** A score of one COW is accumulated for each digit that appears
echo in your guess, but in the WRONG position.
echo.
echo Now, start guessing^^!
echo.
:game
echo.
::/GAME DISPLAY

::INPUT VALIDATION
if !guess! gtr 9876 (echo Please input a valid guess.&goto :game)
if !guess! lss 1234 (echo Please input a valid guess.&goto :game)
set i1=%guess:~0,1%&set i2=%guess:~1,1%&set i3=%guess:~2,1%&set i4=%guess:~3,1%
set chk=1
:cycle
set /a tmp1=%chk%+1
for /l %%a in (%tmp1%,1,4) do (
if !i%chk%!==!i%%a! (
echo Please input a valid guess.&goto :game
)
)
if %chk%==3 (
goto :score
)
set /a chk+=1
goto :cycle
::/INPUT VALIDATION

::SCORING
:score
set /a tries+=1
if %guess%==%code% (goto :won)
set cow=0
set bull=0
for /l %%a in (1,1,4) do (
if !i%%a!==!c%%a! (
set /a bull+=1
) else (
set "entrycow=%%a"
call :scorecow
)
)
set guess=
echo BULLS=%bull% COWS=%cow%
goto :game

:scorecow
set nums=1 2 3 4
set put=!nums:%entrycow%=!
for %%b in (%put%) do (
if !c%%b!==!i%entrycow%! (
set /a cow+=1
goto :EOF
)
)
goto :EOF
::/SCORING

:won
echo.
echo.
echo After %tries% Tries, YOU CRACKED IT^^! My code is %code%.
echo.
set /p opt=Play again?(Y/N)
if /i "!opt!"=="y" (call :begin)
if /i "!opt!"=="n" (exit/b)
goto :won



## BBC BASIC

      secret$= "" REPEAT c$ = CHR$(&30 + RND(9)) IF INSTR(secret$, c$) = 0 secret$ += c$UNTIL LEN(secret$) = 4

PRINT "Guess a four-digit number with no digit used twice."'
guesses% = 0
REPEAT

REPEAT
INPUT "Enter your guess: " guess$IF LEN(guess$) <> 4 PRINT "Must be a four-digit number"
UNTIL LEN(guess$) = 4 guesses% += 1 IF guess$ = secret$PRINT "You won after "; guesses% " guesses!" : END bulls% = 0 cows% = 0 FOR i% = 1 TO 4 c$ = MID$(secret$, i%, 1)
IF MID$(guess$, i%, 1) = c$THEN bulls% += 1 ELSE IF INSTR(guess$, c$) THEN cows% += 1 ENDIF ENDIF NEXT i% PRINT "You got " ;bulls% " bull(s) and " ;cows% " cow(s)." UNTIL FALSE  ## Brat secret_length = 4 secret = [1 2 3 4 5 6 7 8 9].shuffle.pop secret_length score = { guess | cows = 0 bulls = 0 guess.each_with_index { digit, index | true? digit == secret[index] { bulls = bulls + 1 } { true? secret.include?(digit) { cows = cows + 1 } } } [cows: cows, bulls: bulls] } won = false guesses = 1 p "I have chosen a number with four unique digits from 1 through 9. Can you guess it?" while { not won } { print "Guess #{guesses}: " guess = g.strip.dice.map { d | d.to_i } when { guess == secret } { p "You won in #{guesses} guesses!"; won = true } { guess.include?(0) || guess.include?(null) } { p "Your guess should only include digits 1 through 9." } { guess.length != secret.length } { p "Your guess was not the correct length. The number has exactly #{secret.length} digits." } { guess.unique.length != secret.length } { p "Each digit should only appear once in your guess." } { true } { result = score guess p "Score: #{result[:bulls]} bulls, #{result[:cows]} cows." guesses = guesses + 1 } }  ## C {{libheader|ncurses}} #include <stdio.h> #include <stdarg.h> #include <stdlib.h> #include <stdbool.h> #include <curses.h> #include <string.h> #define MAX_NUM_TRIES 72 #define LINE_BEGIN 7 #define LAST_LINE 18 int yp=LINE_BEGIN, xp=0; char number; char guess; #define MAX_STR 256 void mvaddstrf(int y, int x, const char *fmt, ...) { va_list args; char buf[MAX_STR]; va_start(args, fmt); vsprintf(buf, fmt, args); move(y, x); clrtoeol(); addstr(buf); va_end(args); } void ask_for_a_number() { int i=0; char symbols[] = "123456789"; move(5,0); clrtoeol(); addstr("Enter four digits: "); while(i<4) { int c = getch(); if ( (c >= '1') && (c <= '9') && (symbols[c-'1']!=0) ) { addch(c); symbols[c-'1'] = 0; guess[i++] = c; } } } void choose_the_number() { int i=0, j; char symbols[] = "123456789"; while(i<4) { j = rand() % 9; if ( symbols[j] != 0 ) { number[i++] = symbols[j]; symbols[j] = 0; } } }  The following function contains the code to check how many bulls and cows there are. bool take_it_or_not() { int i; int cows=0, bulls=0; for(i=0; i < 4; i++) { if ( number[i] == guess[i] ) { bulls++; } else if ( strchr(number, guess[i]) != NULL ) { cows++; } } move(yp, xp); addstr(guess); addch(' '); if ( bulls == 4 ) { yp++; return true; } if ( (cows==0) && (bulls==0) ) addch('-'); while( cows-- > 0 ) addstr("O"); while( bulls-- > 0 ) addstr("X"); yp++; if ( yp > LAST_LINE ) { yp = LINE_BEGIN; xp += 10; } return false; } bool ask_play_again() { int i; while(yp-- >= LINE_BEGIN) { move(yp, 0); clrtoeol(); } yp = LINE_BEGIN; xp = 0; move(21,0); clrtoeol(); addstr("Do you want to play again? [y/n]"); while(true) { int a = getch(); switch(a) { case 'y': case 'Y': return true; case 'n': case 'N': return false; } } } int main() { bool bingo, again; int tries = 0; initscr(); cbreak(); noecho(); clear(); number = guess = 0; mvaddstr(0,0, "I choose a number made of 4 digits (from 1 to 9) without repetitions\n" "You enter a number of 4 digits, and I say you how many of them are\n" "in my secret number but in wrong position (cows or O), and how many\n" "are in the right position (bulls or X)"); do { move(20,0); clrtoeol(); move(21, 0); clrtoeol(); srand(time(NULL)); choose_the_number(); do { ask_for_a_number(); bingo = take_it_or_not(); tries++; } while(!bingo && (tries < MAX_NUM_TRIES)); if ( bingo ) mvaddstrf(20, 0, "You guessed %s correctly in %d attempts!", number, tries); else mvaddstrf(20,0, "Sorry, you had only %d tries...; the number was %s", MAX_NUM_TRIES, number); again = ask_play_again(); tries = 0; } while(again); nocbreak(); echo(); endwin(); return EXIT_SUCCESS; }  ## C++ #include <iostream> #include <string> #include <algorithm> #include <cstdlib> bool contains_duplicates(std::string s) { std::sort(s.begin(), s.end()); return std::adjacent_find(s.begin(), s.end()) != s.end(); } void game() { typedef std::string::size_type index; std::string symbols = "0123456789"; unsigned int const selection_length = 4; std::random_shuffle(symbols.begin(), symbols.end()); std::string selection = symbols.substr(0, selection_length); std::string guess; while (std::cout << "Your guess? ", std::getline(std::cin, guess)) { if (guess.length() != selection_length || guess.find_first_not_of(symbols) != std::string::npos || contains_duplicates(guess)) { std::cout << guess << " is not a valid guess!"; continue; } unsigned int bulls = 0; unsigned int cows = 0; for (index i = 0; i != selection_length; ++i) { index pos = selection.find(guess[i]); if (pos == i) ++bulls; else if (pos != std::string::npos) ++cows; } std::cout << bulls << " bulls, " << cows << " cows.\n"; if (bulls == selection_length) { std::cout << "Congratulations! You have won!\n"; return; } } std::cerr << "Oops! Something went wrong with input, or you've entered end-of-file!\nExiting ...\n"; std::exit(EXIT_FAILURE); } int main() { std::cout << "Welcome to bulls and cows!\nDo you want to play? "; std::string answer; while (true) { while (true) { if (!std::getline(std::cin, answer)) { std::cout << "I can't get an answer. Exiting.\n"; return EXIT_FAILURE; } if (answer == "yes" || answer == "Yes" || answer == "y" || answer == "Y") break; if (answer == "no" || answer == "No" || answer == "n" || answer == "N") { std::cout << "Ok. Goodbye.\n"; return EXIT_SUCCESS; } std::cout << "Please answer yes or no: "; } game(); std::cout << "Another game? "; } }  ## C# using System; namespace BullsnCows { class Program { static void Main(string[] args) { int[] nums = new int[] { 1, 2, 3, 4, 5, 6, 7, 8, 9 }; KnuthShuffle<int>(ref nums); int[] chosenNum = new int; Array.Copy(nums, chosenNum, 4); Console.WriteLine("Your Guess ?"); while (!game(Console.ReadLine(), chosenNum)) { Console.WriteLine("Your next Guess ?"); } Console.ReadKey(); } public static void KnuthShuffle<T>(ref T[] array) { System.Random random = new System.Random(); for (int i = 0; i < array.Length; i++) { int j = random.Next(array.Length); T temp = array[i]; array[i] = array[j]; array[j] = temp; } } public static bool game(string guess, int[] num) { char[] guessed = guess.ToCharArray(); int bullsCount = 0, cowsCount = 0; if (guessed.Length != 4) { Console.WriteLine("Not a valid guess."); return false; } for (int i = 0; i < 4; i++) { int curguess = (int) char.GetNumericValue(guessed[i]); if (curguess < 1 || curguess > 9) { Console.WriteLine("Digit must be ge greater 0 and lower 10."); return false; } if (curguess == num[i]) { bullsCount++; } else { for (int j = 0; j < 4; j++) { if (curguess == num[j]) cowsCount++; } } } if (bullsCount == 4) { Console.WriteLine("Congratulations! You have won!"); return true; } else { Console.WriteLine("Your Score is {0} bulls and {1} cows", bullsCount, cowsCount); return false; } } } }  ## Ceylon import ceylon.random { DefaultRandom } shared void run() { value random = DefaultRandom(); function generateDigits() => random.elements(1..9).distinct.take(4).sequence(); function validate(String guess) { variable value ok = true; if (!guess.every((Character element) => element.digit)) { print("numbers only, please"); ok = false; } if ('0' in guess) { print("only 1 to 9, please"); ok = false; } if (guess.distinct.shorterThan(guess.size)) { print("no duplicates, please"); ok = false; } if (guess.size != 4) { print("4 digits please"); ok = false; } return ok; } function score({Integer*} target, {Integer*} guess) { variable value bulls = 0; variable value cows = 0; for ([a, b] in zipPairs(target, guess)) { if (a == b) { bulls++; } else if (target.contains(b)) { cows++; } } return [bulls, cows]; } while (true) { value digits = generateDigits(); print("I have chosen my four digits, please guess what they are. Use only the digits 1 to 9 with no duplicates and enter them with no spaces. eg 1234 Enter q or Q to quit."); while (true) { if (exists line = process.readLine()) { if (line.uppercased == "Q") { return; } if (validate(line)) { value guessDigits = line.map((Character element) => Integer.parse(element.string)).narrow<Integer>(); value [bulls, cows] = score(digits, guessDigits); if (bulls == 4) { print("You win!"); break; } else { print("Bulls: bulls, Cows: cows"); } } } } } }  ## Clojure  (ns bulls-and-cows) (defn bulls [guess solution] (count (filter true? (map = guess solution)))) (defn cows [guess solution] (- (count (filter (set solution) guess)) (bulls guess solution))) (defn valid-input? "checks whether the string is a 4 digit number with unique digits" [user-input] (if (re-seq #"^(?!.*(\d).*\1)\d{4}$" user-input)
true
false))

(defn enter-guess []
"Let the user enter a guess. Verify the input. Repeat until valid.
returns a list of digits enters by the user (# # # #)"
(if (valid-input? guess)
(map #(Character/digit % 10) guess)
(recur))))

(defn bulls-and-cows []
"generate a random 4 digit number from the list of (1 ... 9): no repeating digits
player tries to guess the number with bull and cows rules gameplay"
(let [solution ( take 4 (shuffle (range 1 10)))]
(println "lets play some bulls and cows!")
(loop [guess (enter-guess)]
(println (bulls guess solution) " bulls and " (cows guess solution) " cows.")
(if (not= guess solution)
(recur (enter-guess))
(println "You have won!")))))

(bulls-and-cows)



## Coco

To handle I/O, we use functions named say (which simply outputs a string) and prompt (which takes a prompt string to display to the user and returns a line of input, without a trailing newline). These require platform-specific implementations. Here's how they can be implemented for the SpiderMonkey shell:

say = print
prompt = (str) ->
putstr str


We can now solve the task using say and prompt:

const SIZE = 4

secret = _.sample ['1' to '9'], SIZE

for ever
var guess
for ever
guess := _.uniq prompt 'Enter a guess: '
if guess.length === SIZE and not _.difference guess, ['1' to '9'] .length
break
say 'Malformed guess; try again.'
bulls = cows = 0
for i til SIZE
if guess[i] === secret[i]
++bulls
else if _.contains secret, guess[i]
++cows
if bulls === SIZE
break
say "#bulls bull#{[if bulls !== 1 then 's']}, #cows cow#{[if cows !== 1 then 's']}."

say 'A winner is you!'


## Common Lisp

(defun get-number ()
(do ((digits '()))
((>= (length digits) 4) digits)
(pushnew (1+ (random 9)) digits)))

(defun compute-score (guess number)
(let ((cows  0)
(bulls 0))
(map nil (lambda (guess-digit number-digit)
(cond ((= guess-digit number-digit) (incf bulls))
((member guess-digit number)  (incf cows))))
guess number)
(values cows bulls)))

(defun number->guess (number)
(when (integerp number)
(do ((digits '()))
((zerop number) digits)
(multiple-value-bind (quotient remainder) (floor number 10)
(push remainder digits)
(setf number quotient)))))

(defun valid-guess-p (guess)
(and (= 4 (length guess))
(every (lambda (digit) (<= 1 digit 9)) guess)
(equal guess (remove-duplicates guess))))

(defun play-game (&optional (stream *query-io*))
(do ((number (get-number))
(cows   0)
(bulls  0))
((= 4 bulls))
(format stream "~&Guess a 4-digit number: ")
(cond ((not (valid-guess-p guess))
(format stream "~&Malformed guess."))
(t
(setf (values cows bulls) (compute-score guess number))
(if (= 4 bulls)
(format stream "~&Correct, you win!")
(format stream "~&Score: ~a cows, ~a bulls."
cows bulls)))))))


## Crystal

{{trans|Ruby}}

size = 4
secret = ('1'..'9').to_a.sample(size)
guess = [] of Char

i = 0
loop do
i += 1
loop do
print "Guess #{i}: "
guess = gets.not_nil!.chomp.chars
exit if guess.empty?

break if guess.size == size &&
guess.all? { |x| ('1'..'9').includes? x } &&
guess.uniq.size == size

puts "Problem, try again. You need to enter #{size} unique digits from 1 to 9"
end

if guess == secret
puts "Congratulations you guessed correctly in #{i} attempts"
break
end

bulls = cows = 0
size.times do |j|
if guess[j] == secret[j]
bulls += 1
elsif secret.includes? guess[j]
cows += 1
end
end

puts "Bulls: #{bulls}; Cows: #{cows}"
end


## D

void main() {
import std.stdio, std.random, std.string, std.algorithm,
std.range, std.ascii;

immutable hidden = "123456789"d.randomCover.take(4).array;
while (true) {
"Next guess: ".write;
if (d.count == 4 && d.all!isDigit && d.uniq.count == 4) {
immutable bulls = d.zip(hidden).count!q{ a == a },
cows = d.count!(g => hidden.canFind(g)) - bulls;
if (bulls == 4)
return " You guessed it!".writeln;
writefln("bulls %d, cows %d", bulls, cows);
}
" Bad guess! (4 unique digits, 1-9)".writeln;
}
}


{{out}}

Next guess: 6548
bulls 0, cows 3
Bad guess! (4 unique digits, 1-9)
Next guess: 5284
bulls 2, cows 1
Bad guess! (4 unique digits, 1-9)
Next guess: 4386
bulls 0, cows 2
Bad guess! (4 unique digits, 1-9)
Next guess: -
Bad guess! (4 unique digits, 1-9)
Next guess: 5894
bulls 3, cows 0
Bad guess! (4 unique digits, 1-9)
Next guess: 5874
bulls 3, cows 0
Bad guess! (4 unique digits, 1-9)
Next guess: 5814
You guessed it!


## E

Note: This example was deliberately written in an abstracted style, separating out the algorithms, game logic, and UI.

def Digit := 1..9
def Number := Tuple[Digit,Digit,Digit,Digit]

/** Choose a random number to be guessed. */
def pick4(entropy) {
def digits := [1,2,3,4,5,6,7,8,9].diverge()

# Partial Fisher-Yates shuffle
for i in 0..!4 {
def other := entropy.nextInt(digits.size() - i) + i
def t := digits[other]
digits[other] := digits[i]
digits[i] := t
}
return digits(0, 4)
}

/** Compute the score of a guess. */
def scoreGuess(actual :Number, guess :Number) {
var bulls := 0
var cows := 0
for i => digit in guess {
if (digit == actual[i]) {
bulls += 1
} else if (actual.indexOf1(digit) != -1) {
cows += 1
}
}
return [bulls, cows]
}

/** Parse a guess string into a list of digits (Number). */
def parseGuess(guessString, fail) :Number {
if (guessString.size() != 4) {
return fail(I need four digits, not ${guessString.size()} digits.) } else { var digits := [] for c in guessString { if (('1'..'9')(c)) { digits with= c - '0' } else { return fail(I need a digit from 1 to 9, not "$c".)
}
}
return digits
}
}

/** The game loop: asking for guesses and reporting scores and win conditions.
The return value is null or a broken reference if there was a problem. */
def actual := pick4(entropy)

def gameTurn() {
return when (def guessString := askUserForGuess <- ()) -> {
escape tellAndContinue {

def guess := parseGuess(guessString, tellAndContinue)
def [bulls, cows] := scoreGuess(actual, guess)

if (bulls == 4) {
tellUser <- (You got it! The number is $actual!) null } else { tellAndContinue(Your score for$guessString is $bulls bulls and$cows cows.)
}

} catch message {
# The parser or scorer has something to say, and the game continues afterward
when (tellUser <- (message)) -> {
gameTurn()
}
}
} catch p {
# Unexpected problem of some sort
tellUser <- ("Sorry, game crashed.")
throw(p)
}
}

return gameTurn()
}


### REPL user interface

def replBullsAndCows() {
when (
bullsAndCows(fn {
def [guess, env] := edef guess; guess.evalToPair(interp.getTopScope().nestOuter())
interp.setTopScope(env)
guess
}, println, entropy)
) -> {} catch p {
println($p${p.eStack()})
}
}


### Graphical user interface

{{works with|E-on-Java}} (Java Swing)

def guiBullsAndCows() {
var lastGuess := ""
def op := <unsafe:javax.swing.makeJOptionPane>
return bullsAndCows(fn {
lastGuess := op.showInputDialog(null, "Enter your guess:", lastGuess)
if (lastGuess == null) {
# canceled, so just fail to return an answer and let the game logic get GCed
Ref.promise()
} else {
lastGuess
}
}, fn msg {
op.showMessageDialog(null, msg)
}, entropy)
}


## EasyLang

dig[] = [ 1 2 3 4 5 6 7 8 9 ] for i range 4 h = i + random (9 - i) swap dig[i] dig[h] .

# print dig[]

len g[] 4 attempts = 0 repeat repeat ok = 0 s$[] = str_split input if len s$[] = 4 ok = 1 for i range 4 g[i] = number s$[i] if g[i] = 0 ok = 0 . . . until ok = 1 . print g[] attempts += 1 bulls = 0 cows = 0 for i range 4 if g[i] = dig[i] bulls += 1 else for j range 4 if dig[j] = g[i] cows += 1 . . . . print "bulls:" & bulls & " cows:" & cows until bulls = 4 . print "Well done! " & attempts & " attempts needed."  ## Eiffel Eiffel class BULLS_AND_COWS create execute feature execute -- Initiate game. do io.put_string ("Let's play bulls and cows.%N") create answer.make_empty play end feature {NONE} play -- Plays bulls ans cows. local count, seed: INTEGER guess: STRING do from until seed > 0 loop io.put_string ("Enter a positive integer.%NYour play will be generated from it.%N") io.read_integer seed := io.last_integer end generate_answer (seed) io.put_string ("Your game has been created.%N Try to guess the four digit number.%N") create guess.make_empty from until guess ~ answer loop io.put_string ("Guess: ") io.read_line guess := io.last_string if guess.count = 4 and guess.is_natural and not guess.has ('0') then io.put_string (score (guess) + "%N") count := count + 1 else io.put_string ("Your input does not have the correct format.") end end io.put_string ("Congratulations! You won with " + count.out + " guesses.") end answer: STRING generate_answer (s: INTEGER) -- Answer with 4-digits between 1 and 9 stored in 'answer'. require positive_seed: s > 0 local random: RANDOM ran: INTEGER do create random.set_seed (s) from until answer.count = 4 loop ran := (random.double_item * 10).floor if ran > 0 and not answer.has_substring (ran.out) then answer.append (ran.out) end random.forth end ensure answer_not_void: answer /= Void correct_length: answer.count = 4 end score (g: STRING): STRING -- Score for the guess 'g' depending on 'answer'. require same_length: answer.count = g.count local k: INTEGER a, ge: STRING do Result := "" a := answer.twin ge := g.twin across 1 |..| a.count as c loop if a [c.item] ~ ge [c.item] then Result := Result + "BULL " a [c.item] := ' ' ge [c.item] := ' ' end end across 1 |..| a.count as c loop if a [c.item] /= ' ' then k := ge.index_of (a [c.item], 1) if k > 0 then Result := Result + "COW " ge [k] := ' ' end end end end end  {{out}}  Let's play bulls and cows. Enter a positive integer. Your play will be generated from it. 2 Guess: 2497 BULL COW Guess: 2486 BULL COW COW Guess: 2485 BULL COW COW Guess: 2483 BULL BULL COW COW Guess: 2438 BULL COW COW COW Guess: 2843 BULL BULL BULL BULL Congratulations! You won with 6 guesses.  ## Elena ELENA 4.1 : import system'routines; import extensions; class GameMaster { object theNumbers; object theAttempt; constructor() { // generate secret number var randomNumbers := new int[]::(1,2,3,4,5,6,7,8,9).randomize(9); theNumbers := randomNumbers.Subarray(0, 4); theAttempt := new Integer(1); } ask() { var row := console.print("Your Guess #",theAttempt," ?").readLine(); ^ row.toArray() } proceed(guess) { int cows := 0; int bulls := 0; if (guess.Length != 4) { bulls := -1 } else { try { for (int i := 0, i < 4, i+=1) { var ch := guess[i]; var number := ch.toString().toInt(); // check range ifnot (number > 0 && number < 10) { InvalidArgumentException.raise() }; // check duplicates var duplicate := guess.seekEach:(x => (x == ch)&&(x.equalReference(ch).Inverted)); if (nil != duplicate) { InvalidArgumentException.raise() }; if (number == theNumbers[i]) { bulls += 1 } else { if (theNumbers.ifExists(number)) { cows += 1 } } } } catch(Exception e) { bulls := -1 } }; bulls => -1 { console.printLine:"Not a valid guess."; ^ true } 4 { console.printLine:"Congratulations! You have won!"; ^ false } : { theAttempt.append(1); console.printLine("Your Score is ",bulls," bulls and ",cows," cows"); ^ true } } } public program() { var gameMaster := new GameMaster(); (lazy:gameMaster.proceed(gameMaster.ask())).doWhile(); console.readChar() }  {{out}}  Your Guess #1 ?2497 Your Score is 1 bulls and 1 cows Your Guess #2 ?2486 Your Score is 1 bulls and 2 cows Your Guess #3 ?2485 Your Score is 1 bulls and 2 cows Your Guess #4 ?2483 Your Score is 2 bulls and 2 cows Your Guess #5 ?2438 Your Score is 1 bulls and 3 cows Your Guess #6 ?2843 Congratulations! You have won!  ## Elixir {{works with|Elixir|1.2}} defmodule Bulls_and_cows do def play(size \\ 4) do secret = Enum.take_random(1..9, size) |> Enum.map(&to_string/1) play(size, secret) end defp play(size, secret) do guess = input(size) if guess == secret do IO.puts "You win!" else {bulls, cows} = count(guess, secret) IO.puts " Bulls: #{bulls}; Cows: #{cows}" play(size, secret) end end defp input(size) do guess = IO.gets("Enter your #{size}-digit guess: ") |> String.strip cond do guess == "" -> IO.puts "Give up" exit(:normal) String.length(guess)==size and String.match?(guess, ~r/^[1-9]+$/) ->
String.codepoints(guess)
true -> input(size)
end
end

defp count(guess, secret) do
Enum.zip(guess, secret) |>
Enum.reduce({0,0}, fn {g,s},{bulls,cows} ->
cond do
g == s      -> {bulls + 1, cows}
g in secret -> {bulls, cows + 1}
true        -> {bulls, cows}
end
end)
end
end

Bulls_and_cows.play


{{out}}


Bulls: 1; Cows: 1
Bulls: 0; Cows: 2
Bulls: 0; Cows: 1
Bulls: 1; Cows: 0
You win!



## Erlang

Module:

-module(bulls_and_cows).
-export([generate_secret/0, score_guess/2, play/0]).

% generate the secret code
generate_secret() -> generate_secret([], 4, lists:seq(1,9)).
generate_secret(Secret, 0, _) -> Secret;
generate_secret(Secret, N, Digits) ->
Next = lists:nth(random:uniform(length(Digits)), Digits),
generate_secret(Secret ++ [Next], N - 1, Digits -- [Next]).

% evaluate a guess
score_guess(Secret, Guess)
when length(Secret) =/= length(Guess) -> throw(badguess);
score_guess(Secret, Guess) ->
Bulls = count_bulls(Secret,Guess),
Cows = count_cows(Secret, Guess, Bulls),
[Bulls, Cows].

% count bulls (exact matches)
count_bulls(Secret, Guess) ->
length(lists:filter(fun(I) -> lists:nth(I,Secret) == lists:nth(I,Guess) end,
lists:seq(1, length(Secret)))).

% count cows (digits present but out of place)
count_cows(Secret, Guess, Bulls) ->
length(lists:filter(fun(I) -> lists:member(I, Guess) end, Secret)) - Bulls.

% play a game
play() -> play_round(generate_secret()).

play_round(Secret, Guess) ->
play_round(Secret, Guess, score_guess(Secret,Guess)).

play_round(_, _, [4,0]) ->
io:put_chars("Correct!\n");

play_round(Secret, _, Score) ->
io:put_chars("\tbulls:"), io:write(hd(Score)), io:put_chars(", cows:"),
io:write(hd(tl(Score))), io:put_chars("\n"), play_round(Secret).

lists:map(fun(D)->D-48 end,
lists:sublist(io:get_line("Enter your 4-digit guess: "), 4)).


Script:

#!/usr/bin/escript
% Play Bulls and Cows
main(_) -> random:seed(now()), bulls_and_cows:play().


Sample play:

Enter your 4-digit guess: 8376
bulls:1, cows:0
bulls:1, cows:1
bulls:1, cows:1
bulls:1, cows:1
Correct!



## Euphoria

{{works with|Euphoria|4.0.3, 4.0.0 RC1 and later}}

include std\text.e
include std\os.e
include std\sequence.e
include std\console.e

sequence bcData = {0,0} --bull,cow score for the player
sequence goalNum = { {0,0,0,0}, {0,0,0,0}, 0} --computer's secret number digits (element 1), marked as bull/cow
--indexes in element 2, integer value of it in element 3
sequence currentGuess = { {0,0,0,0}, {0,0,0,0}, 0} --player's guess, same format as goalNum
sequence removeChars = 0 & " 0\r\t\n" --characters to trim (remove) from user's input. \r, \t are single escaped characters,
--0 is ascii 0x0 and number zero is ascii 48, or 0x30. The rest are wysiwyg
integer tries = 0 --track number of tries to guess the number
sequence bcStrings ={"bull", "cow"} --stores singular and/or plural strings depending on score in bcData

goalNum = rand( {9,9,9,9} ) --rand function works on objects. here it outputs into each sequence element.
goalNum = goalNum * 1000 + goalNum * 100 + goalNum * 10 + goalNum --convert digits to an integer
--and store it

procedure getInputAndProcess(integer stage = 1)  --object = 1 sets default value for the parameter if it isn't specified

goalNum[1..4] = 0 --{0,0,0,0} --set these to unscaned (0) since the scanning will start over.
currentGuess[1..4] = 0 --{0,0,0,0} --these too, or they will contain old marks
currentGuess[1..4] = 0
tries += 1 --equivalent to tries = tries + 1, but faster and shorter to write
bcData[1..2] = 0 -- {0,0}

if stage <= 1 then --if this process was run for the first time or with no parameters, then..
puts(1,"The program has thought of a four digit number using only digits 1 to 9.\nType your guess and press enter.\n")
end if

while 1 label "guesscheck" do --labels can be used to specify a jump point from exit or retry, and help readability
currentGuess = trim(gets(0), removeChars) --get user input, trim unwanted characters from it, store it in currentGuess
currentGuess = mapping( currentGuess, {49,50,51,52,53,54,55,56,57}, {1,2,3,4,5,6,7,8,9} ) --convert ascii codes to
-- integer digits they represent
integer tempF = find('0',currentGuess)
if length(currentGuess) != 4 or tempF != 0 then --if the input string is now more than 4 characters/integers,
--the input won't be used.
puts(1,"You probably typed too many digits or a 0. Try typing a new 4 digit number with only numbers 1 through 9.\n")
retry "guesscheck"
else
exit "guesscheck"
end if
end while
--convert separate digits to the one integer they represent and store it, like with goalNum
currentGuess = currentGuess * 1000 + currentGuess * 100 + currentGuess * 10 + currentGuess
--convert digits to the integer they represent, to print to a string later

--check for bulls
for i = 1 to 4 do
if goalNum[i] = currentGuess[i] then
goalNum[i] = 1
currentGuess[i] = 1
bcData += 1
end if
end for

--check for cows, but not slots marked as bulls or cows already.
for i = 1 to 4 label "iGuessElem"do --loop through each guessed digit
for j = 1 to 4 label "jGoalElem" do --but first go through each goal digit, comparing the first guessed digit,
--and then the other guessed digits 2 through 4

if currentGuess[i] = 1 then --if the guessed digit we're comparing right now has been marked as bull or cow already
continue "iGuessElem" --skip to the next guess digit without comparing this guess digit to the other goal digits
end if

if goalNum[j] = 1 then --if the goal digit we're comparing to right now has been marked as a bull or cow already
end if

if currentGuess[i] = goalNum[j] then --if the guessed digit is the same as the goal one,
--it won't be a bull, so it's a cow
bcData += 1 --score one more cow
goalNum[j] = 1 --mark this digit as a found cow in the subsequence that stores 0's or 1's as flags
continue "iGuessElem" --skip to the next guess digit, so that this digit won't try to check for
--matches(cow) with other goal digits
end if

end for --this guess digit was compared to one goal digit , try comparing this guess digit with the next goal digit
end for --this guess digit was compared with all goal digits, compare the next guess digit to all the goal digits

if bcData = 1 then --uses singular noun when there is score of 1, else plural
bcStrings = "bull"
else
bcStrings = "bulls"
end if

if bcData = 1 then --the same kind of thing as above block
bcStrings = "cow"
else
bcStrings = "cows"
end if

if bcData < 4 then --if less than 4 bulls were found, the player hasn't won, else they have...
printf(1, "Guess #%d : You guessed %d . You found %d %s, %d %s. Type new guess.\n", {tries, currentGuess, bcData, bcStrings, bcData, bcStrings} )
getInputAndProcess(2)
else --else they have won and the procedure ends
printf(1, "The number was %d. You guessed %d in %d tries.\n", {goalNum, currentGuess, tries} )
any_key()--wait for keypress before closing console window.
end if

end procedure
--run the procedure
getInputAndProcess(1)



Output :


The program has thought of a four digit number using only digits 1 to 9.
Type your guess and press enter.
7456
Guess #1 : You guessed 7456 . You found 1 bull, 1 cow. Type new guess.
7116
Guess #2 : You guessed 7116 . You found 1 bull, 0 cows. Type new guess.
7862
Guess #3 : You guessed 7862 . You found 0 bulls, 2 cows. Type new guess.
1826
[...etc]
6586
Guess #10 : You guessed 6586 . You found 3 bulls, 0 cows. Type new guess.
5586
Guess #11 : You guessed 5586 . You found 3 bulls, 0 cows. Type new guess.
2586
Guess #12 : You guessed 2586 . You found 3 bulls, 0 cows. Type new guess.
9586
The number was 9586. You guessed 9586 in 13 tries.
Press Any Key to continue...



## Factor

USING: accessors assocs combinators fry grouping hashtables kernel
locals math math.parser math.ranges random sequences strings
io ascii ;

IN: bullsncows

TUPLE: score bulls cows ;
: <score> ( -- score ) 0 0 score boa ;

TUPLE: cow ;
: <cow> ( -- cow ) cow new ;

TUPLE: bull ;
: <bull> ( -- bull ) bull new ;

: inc-bulls ( score -- score ) dup bulls>> 1 + >>bulls ;
: inc-cows ( score -- score ) dup cows>> 1 + >>cows ;

: random-nums ( -- seq ) 9 [1,b] 4 sample ;

: add-digits ( seq -- n ) 0 [ swap 10 * + ] reduce number>string ;

: new-number ( -- n narr ) random-nums dup add-digits ;

: narr>nhash ( narr -- nhash ) { 1 2 3 4 } swap zip ;

: num>hash ( n -- hash )
[ 1string string>number ] { } map-as narr>nhash ;

:: cow-or-bull ( n g -- arr )
{
{ [ n first g at n second = ] [ <bull> ] }
{ [ n second g value? ] [ <cow> ] }
[ f ]
} cond ;

: add-to-score ( arr -- score )
<score> [ bull? [ inc-bulls ] [ inc-cows ] if ] reduce ;

: check-win ( score -- ? ) bulls>> 4 = ;

: sum-score ( n g -- score ? )
'[ _ cow-or-bull ] map sift add-to-score dup check-win ;

: print-sum ( score -- str )
dup bulls>> number>string "Bulls: " swap append swap cows>> number>string
" Cows: " swap 3append "\n" append ;

: (validate-readln) ( str -- ? ) dup length 4 = not swap [ letter? ] all? or ;

: validate-readln ( -- str )
[ "Invalid input.\nPlease enter a valid 4 digit number: "
when ;

: win ( -- ) "\nYou've won! Good job. You're so smart." print flush ;

: main-loop ( x -- )
"Enter a 4 digit number: " write flush validate-readln num>hash swap
[ sum-score swap print-sum print flush ] keep swap not
[ main-loop ] [ drop win ] if ;

: main ( -- ) new-number drop narr>nhash main-loop ;


## Fan

**
** Bulls and cows. A game pre-dating, and similar to, Mastermind.
**
class BullsAndCows
{

Void main()
{
digits := [1,2,3,4,5,6,7,8,9]
size := 4
chosen := [,]

echo("I've chosen $size unique digits from 1 to 9 at random. Try to guess my number!") guesses := 0 while (true) // game loop { guesses += 1 guess := Int[,] while (true) // input loop { // get a good guess Sys.out.print("\nNext guess [$guesses]: ")
Sys.out.flush
inString.each |ch|
{ if (ch >= '1' && ch <= '9' && !guess.contains(ch)) guess.add(ch-'0') }
if (guess.size == 4)
break // input loop
echo("Oops, try again. You need to enter $size unique digits from 1 to 9") } if (guess.all |v, i->Bool| { return v == chosen[i] }) { echo("\nCongratulations! You guessed correctly in$guesses guesses")
break // game loop
}
bulls := 0
cows  := 0
(0 ..< size).each |i|
{
if (guess[i] == chosen[i])
bulls += 1
else if (chosen.contains(guess[i]))
cows += 1
}
echo("\n  $bulls Bulls\n$cows Cows")
}
}
}


## Forth

{{works with|GNU Forth}}

include random.fs

create hidden 4 allot

: ok? ( str -- ? )
dup 4 <> if 2drop false exit then
1 9 lshift 1- -rot
bounds do
i c@ '1 -
dup 0 9 within 0= if 2drop false leave then
1 swap lshift over and
dup 0= if nip leave then
xor
loop 0<> ;

: init
begin
hidden 4 bounds do 9 random '1 + i c! loop
hidden 4 ok?
until ;

: check? ( addr -- solved? )
0
4 0 do
over i + c@
4 0 do
dup hidden i + c@ = if     swap
i j = if 8 else 1 then + swap
then
loop drop
loop nip
8 /mod tuck . ." bulls, " . ." cows"
4 = ;

: guess: ( "1234" -- )
bl parse 2dup ok? 0= if 2drop ." Bad guess! (4 unique digits, 1-9)" exit then
drop check? if cr ." You guessed it!" then ;


init ok guess: 1234 1 bulls, 0 cows ok guess: 1567 1 bulls, 1 cows ok guess: 1895 2 bulls, 1 cows ok guess: 1879 4 bulls, 0 cows You guessed it! ok

## Fortran

{{works with|Fortran|90 and later}}

module bac
implicit none

contains

subroutine Gennum(n)
integer, intent(out) :: n(4)
integer :: i, j
real :: r

call random_number(r)
n(1) = int(r * 9.0) + 1
i = 2

outer: do while (i <= 4)
call random_number(r)
n(i) = int(r * 9.0) + 1
inner:   do j = i-1 , 1, -1
if (n(j) == n(i)) cycle outer
end do inner
i = i + 1
end do outer

end subroutine Gennum

subroutine Score(n, guess, b, c)
character(*), intent(in) :: guess
integer, intent(in) :: n(0:3)
integer, intent(out) :: b, c
integer :: digit, i, j, ind

b = 0; c = 0
do i = 1, 4
if (digit == n(i-1)) then
b = b + 1
else
do j = i, i+2
ind = mod(j, 4)
if (digit == n(ind)) then
c = c + 1
exit
end if
end do
end if
end do

end subroutine Score

end module bac

program Bulls_and_Cows
use bac
implicit none

integer :: n(4)
integer :: bulls=0, cows=0, tries=0
character(4) :: guess

call random_seed
call Gennum(n)

write(*,*) "I have selected a number made up of 4 digits (1-9) without repetitions."
write(*,*) "You attempt to guess this number."
write(*,*) "Every digit in your guess that is in the correct position scores 1 Bull"
write(*,*) "Every digit in your guess that is in an incorrect position scores 1 Cow"
write(*,*)

do while (bulls /= 4)
write(*,*) "Enter a 4 digit number"
if (verify(guess, "123456789") /= 0) then
write(*,*) "That is an invalid entry. Please try again."
cycle
end if
tries = tries + 1
call Score (n, guess, bulls, cows)
write(*, "(a, i1, a, i1, a)") "You scored ", bulls, " bulls and ", cows, " cows"
write(*,*)
end do

write(*,"(a,i0,a)") "Congratulations! You correctly guessed the correct number in ", tries, " attempts"

end program Bulls_and_Cows


## Go

package main

import (
"bufio"
"bytes"
"fmt"
"math/rand"
"os"
"strings"
"time"
)

func main() {
fmt.Println(Cows and Bulls
Guess four digit number of unique digits in the range 1 to 9.
A correct digit but not in the correct place is a cow.
A correct digit in the correct place is a bull.)
// generate pattern
pat := make([]byte, 4)
rand.Seed(time.Now().Unix())
r := rand.Perm(9)
for i := range pat {
pat[i] = '1' + byte(r[i])
}

// accept and score guesses
valid := []byte("123456789")
guess:
for in := bufio.NewReader(os.Stdin); ; {
fmt.Print("Guess: ")
if err != nil {
fmt.Println("\nSo, bye.")
return
}
guess = strings.TrimSpace(guess)
if len(guess) != 4 {
// malformed:  not four characters
fmt.Println("Please guess a four digit number.")
continue
}
var cows, bulls int
for ig, cg := range guess {
if strings.IndexRune(guess[:ig], cg) >= 0 {
// malformed:  repeated digit
fmt.Printf("Repeated digit: %c\n", cg)
continue guess
}
switch bytes.IndexByte(pat, byte(cg)) {
case -1:
if bytes.IndexByte(valid, byte(cg)) == -1 {
// malformed:  not a digit
fmt.Printf("Invalid digit: %c\n", cg)
continue guess
}
default: // I just think cows should go first
cows++
case ig:
bulls++
}
}
fmt.Printf("Cows: %d, bulls: %d\n", cows, bulls)
if bulls == 4 {
fmt.Println("You got it.")
return
}
}
}


## Golo

#!/usr/bin/env golosh
----
This module is the Bulls and Cows game.
----
module Bullsandcows

import gololang.Decorators
import gololang.Functions
import gololang.IO
import java.util

function main = |args| {
while true {
let secret = create4RandomNumbers()
println("Welcome to Bulls And Cows")
while true {
println("Please enter a 4 digit number")
println("(with only the digits 1 to 9 and no repeated digits, for example 2537)")
let result = validateGuess(guess)
if result: isValid() {
let bulls, cows = bullsAndOrCows(result: digits(), secret)
if bulls is 4 {
println("You win!")
break
}
println("bulls: " + bulls)
println("cows:  " + cows)
} else {
println(result: message())
}
}
}
}

function create4RandomNumbers = {
let numbers = vector[1, 2, 3, 4, 5, 6, 7, 8, 9]
Collections.shuffle(numbers)
let shuffled = numbers: subList(0, 4)
return shuffled
}

union Result = {
Valid = { digits }
Invalid = { message }
}

@checkArguments(isString())
function validateGuess = |guess| {
var digits = []
try {
let number = guess: toInt()
digits = number: digits()
if digits: exists(|d| -> d is 0) {
}
if digits: size() isnt 4  {
}
let digitSet = set[ digit foreach digit in digits ]
if digitSet: size() < digits: size() {
}
} catch(e) {
}
return Result.Valid(digits)
}

let is4Vector = |arg| -> arg oftype java.util.List.class and arg: size() is 4

@checkArguments(is4Vector, is4Vector)
function bullsAndOrCows = |guess, secret| {
var bulls = 0
var cows = 0
foreach i in [0..4] {
let guessNum = guess: get(i)
let secretNum = secret: get(i)
if guessNum is secretNum {
bulls = bulls + 1
} else if secret: exists(|num| -> guessNum is num) {
cows = cows + 1
}
}
return [bulls, cows]
}

augment java.lang.Integer {

function digits = |this| {
var remaining = this
let digits = vector[]
while remaining > 0 {
digits: prepend(remaining % 10)
remaining = remaining / 10
}
return digits
}
}



import Data.List (partition, intersect, nub)
import System.Random (StdGen, getStdRandom, randomR)
import Text.Printf

numberOfDigits = 4 :: Int

main = bullsAndCows

bullsAndCows :: IO ()
bullsAndCows = do
digits <- getStdRandom $pick numberOfDigits ['1' .. '9'] putStrLn "Guess away!" loop digits where loop digits = do input <- getLine if okay input then let (bulls, cows) = score digits input in if bulls == numberOfDigits then putStrLn "You win!" else do printf "%d bulls, %d cows.\n" bulls cows loop digits else do putStrLn "Malformed guess; try again." loop digits okay :: String -> Bool okay input = length input == numberOfDigits && input == nub input && all legalchar input where legalchar c = '1' <= c && c <= '9' score :: String -> String -> (Int, Int) score secret guess = (length bulls, cows) where (bulls, nonbulls) = partition (uncurry (==))$
zip secret guess
cows = length $uncurry intersect$ unzip nonbulls

pick :: Int -> [a] -> StdGen -> ([a], StdGen)
{- Randomly selects items from a list without replacement. -}
pick n l g = f n l g (length l - 1) []
where  f 0 _ g _   ps = (ps, g)
f n l g max ps =
f (n - 1) (left ++ right) g' (max - 1) (picked : ps)
where (i, g') = randomR (0, max) g
(left, picked : right) = splitAt i l


## Hy

(import random)

(def +size+ 4)
(def +digits+ "123456789")
(def +secret+ (random.sample +digits+ +size+))

(while True
(while True
(setv guess (list (distinct (raw-input "Enter a guess: "))))
(when (and
(= (len guess) +size+)
(all (map (fn [c] (in c +digits+)) guess)))
(break))
(print "Malformed guess; try again"))
(setv bulls 0)
(setv cows 0)
(for [i (range +size+)] (cond
[(= (get guess i) (get +secret+ i)) (setv bulls (inc bulls))]
[(in (get guess i) +secret+) (setv cows (inc cows))]))
(when (= bulls +size+)
(break))
(print (.format "{} bull{}, {} cows"
bulls (if (= bulls 1) "" "s")
cows (if (= cows 1) "" "s"))))

(print "A winner is you!")


The following works in both Icon and Unicon.

procedure main()
digits := "123456789"
every !digits :=: ?digits
num := digits[1+:4]
repeat if score(num, getGuess(num)) then break
write("Good job.")
end

procedure getGuess(num)
repeat {
writes("Enter a guess: ")
if *(guess ** '123456789') == *num then return guess
write("Malformed guess: ",guess,". Try again.")
}
end

procedure score(num, guess)
bulls := 0
cows := *(num ** guess)
every (num[i := 1 to *num] == guess[i], bulls +:= 1, cows -:= 1)
write("\t",bulls," bulls and ",cows," cows")
return (bulls = *num)
end


## J

require 'misc'

plural=: conjunction define
(":m),' ',n,'s'#~1~:m
)

number=. 1+4?9
whilst. -.guess-:number do.
guess=. 0 "."0 prompt 'Guess my number: '
if. (4~:#guess)+.(4~:#~.guess)+.0 e.guess e.1+i.9 do.
if. 0=#guess do.
smoutput 'Giving up.'
return.
end.
smoutput 'Guesses must be four different non-zero digits'
continue.
end.
bulls=. +/guess=number
cows=. (+/guess e.number)-bulls
smoutput bulls plural 'bull',' and ',cows plural 'cow','.'
end.
smoutput 'you win'
)


For example:

   bullcow''
Guess my number: 1234
0 bulls and 1 cow.
Guess my number: 5678
3 bulls and 0 cows.
Guess my number: 2349
0 bulls and 0 cows.
Guess my number: 1567
0 bulls and 3 cows.
Guess my number: 6178
3 bulls and 0 cows.
Guess my number: 6157
1 bull and 2 cows.
Guess my number: 5178
4 bulls and 0 cows.
you win


## Java

import java.util.InputMismatchException;
import java.util.Random;
import java.util.Scanner;

public class BullsAndCows{
public static void main(String[] args){
Random gen= new Random();
int target= 0;
while(hasDupes(target= (gen.nextInt(9000) + 1000)));
String targetStr = target +"";
boolean guessed = false;
Scanner input = new Scanner(System.in);
int guesses = 0;
do{
int bulls = 0;
int cows = 0;
System.out.print("Guess a 4-digit number with no duplicate digits: ");
int guess;
try{
guess = input.nextInt();
if(hasDupes(guess) || guess < 1000) continue;
}catch(InputMismatchException e){
continue;
}
guesses++;
String guessStr = guess + "";
for(int i= 0;i < 4;i++){
if(guessStr.charAt(i) == targetStr.charAt(i)){
bulls++;
}else if(targetStr.contains(guessStr.charAt(i)+"")){
cows++;
}
}
if(bulls == 4){
guessed = true;
}else{
System.out.println(cows+" Cows and "+bulls+" Bulls.");
}
}while(!guessed);
System.out.println("You won after "+guesses+" guesses!");
}

public static boolean hasDupes(int num){
boolean[] digs = new boolean;
while(num > 0){
if(digs[num%10]) return true;
digs[num%10] = true;
num/= 10;
}
return false;
}
}


Output:

Guess a 4-digit number with no duplicate digits: 5834
2 Cows and 0 Bulls.
Guess a 4-digit number with no duplicate digits: 1234
1 Cows and 0 Bulls.
Guess a 4-digit number with no duplicate digits: 4321
1 Cows and 0 Bulls.
Guess a 4-digit number with no duplicate digits: 3421
0 Cows and 1 Bulls.
Guess a 4-digit number with no duplicate digits: 8412
0 Cows and 0 Bulls.
Guess a 4-digit number with no duplicate digits: 3560
1 Cows and 1 Bulls.
Guess a 4-digit number with no duplicate digits: 3650
0 Cows and 2 Bulls.
Guess a 4-digit number with no duplicate digits: 3759
2 Cows and 2 Bulls.
Guess a 4-digit number with no duplicate digits: 3975
2 Cows and 2 Bulls.
Guess a 4-digit number with no duplicate digits: 3957
You won after 10 guesses!


## JavaScript

### Spidermonkey version

#!/usr/bin/env js

function main() {
var len = 4;
playBullsAndCows(len);
}

function playBullsAndCows(len) {
var num = pickNum(len);
// print('The secret number is:\n  ' + num.join('\n  '));
showInstructions(len);
var nGuesses = 0;
while (true) {
nGuesses++;
var guess = getGuess(nGuesses, len);
var census = countBovine(num, guess);
showScore(census.bulls, census.cows);
if (census.bulls == len) {
showFinalResult(nGuesses);
return;
}
}
}

function showScore(nBulls, nCows) {
print('    Bulls: ' + nBulls + ', cows: ' + nCows);
}

function showFinalResult(guesses) {
print('You win!!! Guesses needed: ' + guesses);
}

function countBovine(num, guess) {
var count = {bulls:0, cows:0};
var g = guess.join('');
for (var i = 0; i < num.length; i++) {
var digPresent = g.search(num[i]) != -1;
if (num[i] == guess[i]) count.bulls++;
else if (digPresent) count.cows++;
}
return count;
}

function getGuess(nGuesses, len) {
while (true) {
putstr('Your guess #' + nGuesses + ': ');
guess = String(parseInt(guess)).split('');
if (guess.length != len) {
print('  You must enter a ' + len + ' digit number.');
continue;
}
if (hasDups(guess)) {
print('  No digits can be duplicated.');
continue;
}
return guess;
}
}

function hasDups(ary) {
var t = ary.concat().sort();
for (var i = 1; i < t.length; i++) {
if (t[i] == t[i-1]) return true;
}
return false;
}

function showInstructions(len) {
print();
print('Bulls and Cows Game');
print('-------------------');
print('  You must guess the ' + len + ' digit number I am thinking of.');
print('  The number is composed of the digits 1-9.');
print('  No digit appears more than once.');
print('  After each of your guesses, I will tell you:');
print('    The number of bulls (digits in right place)');
print('    The number of cows (correct digits, but in the wrong place)');
print();
}

function pickNum(len) {
var nums = [1, 2, 3, 4, 5, 6, 7, 8, 9];
nums.sort(function(){return Math.random() - 0.5});
return nums.slice(0, len);
}

main();



Example game (cheating!):

## Bulls and Cows Game

You must guess the 4 digit number I am thinking of. The number is composed of the digits 1-9. No digit appears more than once. After each of your guesses, I will tell you: The number of bulls (digits in right place) The number of cows (correct digits, but in wrong place)

Your guess #1: 1234 Bulls: 0, cows: 2 Your guess #2: 5678 Bulls: 1, cows: 1 Your guess #3: 3167 Bulls: 0, cows: 3 Your guess #4: 9123 Bulls: 1, cows: 1 Your guess #5: 5137 Bulls: 1, cows: 3 Your guess #6: 5317 Bulls: 2, cows: 2 Your guess #7: 5731 Bulls: 2, cows: 2 Your guess #8: 5713 Bulls: 4, cows: 0 You win! Guesses needed: 8

## Julia

function cowsbulls()
print("Welcome to Cows & Bulls! I've picked a number with unique digits between 1 and 9, go ahead and type your guess.\n
You get one bull for every right number in the right position.\n
You get one cow for every right number, but in the wrong position.\n
Enter 'n' to pick a new number and 'q' to quit.\n>")
function new_number()
s = [1:9]
n = ""
for i = 9:-1:6
n *= string(delete!(s,rand(1:i)))
end
return n
end
while true
input == "q" && break
if input == "n"
print("\nI've picked a new number, go ahead and guess\n>")
continue
end
!ismatch(r"^[1-9]{4}$",input) && (print("Invalid guess: Please enter a 4-digit number\n>"); continue) if input == answer print("\nYou're right! Good guessing!\nEnter 'n' for a new number or 'q' to quit\n>") else bulls = sum(answer.data .== input.data) cows = sum([answer[x] != input[x] && contains(input.data,answer[x]) for x = 1:4]) print("\nNot quite! Your guess is worth:\n$bulls Bulls\n$cows Cows\nPlease guess again\n\n>") end end end  The following version checks thoroughly that the input of the player is constituted of four distincts digits. function bullsandcows () bulls = cows = turns = 0 result = (s = [] ; while length(unique(s))<4 push!(s,rand('1':'9')) end; unique(s)) println("A game of bulls and cows!") while (bulls != 4) print("Your guess? ") guess = collect(chomp(readline(STDIN))) if ! (length(unique(guess)) == length(guess) == 4 && all(isdigit,guess)) println("please, enter four distincts digits") continue end bulls = sum(map(==, guess, result)) cows = length(intersect(guess,result)) - bulls println("$bulls bulls and $cows cows!") ; turns += 1 end println("You win! You succeeded in$turns guesses.")
end


{{Out}}

julia> bullsandcows()
A game of bulls and cows!
0 bulls and 2 cows!
1 bulls and 1 cows!


## Kotlin

// version 1.1.2

import java.util.Random

const val MAX_GUESSES = 20  // say

fun main(args: Array<String>) {
val r = Random()
var num: String
// generate a 4 digit random number from 1234 to 9876 with no zeros or repeated digits
do {
num = (1234 + r.nextInt(8643)).toString()
} while ('0' in num || num.toSet().size < 4)

println("All guesses should have exactly 4 distinct digits excluding zero.")
println("Keep guessing until you guess the chosen number (maximum $MAX_GUESSES valid guesses).\n") var guesses = 0 while (true) { print("Enter your guess : ") val guess = readLine()!! if (guess == num) { println("You've won with${++guesses} valid guesses!")
return
}
val n = guess.toIntOrNull()
if (n == null)
println("Not a valid number")
else if ('-' in guess || '+' in guess)
println("Can't contain a sign")
else if ('0' in guess)
println("Can't contain zero")
else if (guess.length != 4)
println("Must have exactly 4 digits")
else if (guess.toSet().size < 4)
println("All digits must be distinct")
else {
var bulls = 0
var cows  = 0
for ((i, c) in guess.withIndex()) {
if (num[i] == c) bulls++
else if (c in num) cows++
}
println("Your score for this guess:  Bulls = $bulls Cows =$cows")
guesses++
if (guesses == MAX_GUESSES)
println("You've now had $guesses valid guesses, the maximum allowed") } } }  Sample input/output: {{out}}  Enter your guess : 1234 Your score for this guess: Bulls = 0 Cows = 2 Enter your guess : 1256 Your score for this guess: Bulls = 0 Cows = 2 Enter your guess : 2178 Your score for this guess: Bulls = 1 Cows = 0 Enter your guess : 2519 Your score for this guess: Bulls = 3 Cows = 0 Enter your guess : 2569 Your score for this guess: Bulls = 3 Cows = 0 Enter your guess : 2579 Your score for this guess: Bulls = 3 Cows = 0 Enter your guess : 2589 Your score for this guess: Bulls = 3 Cows = 0 Enter your guess : 2539 Your score for this guess: Bulls = 3 Cows = 0 Enter your guess : 2549 You've won with 9 valid guesses!  ## Lasso This game uses an HTML form to submit the answer. The random number and history are stored in a session using Lasso's built in session management. [ define randomizer() => { local(n = string) while(#n->size < 4) => { local(r = integer_random(1,9)->asString) #n !>> #r ? #n->append(#r) } return #n } define cowbullchecker(n::string,a::string) => { integer(#n) == integer(#a) ? return (:true,map('cows'=0,'bulls'=4,'choice'=#a)) local(cowbull = map('cows'=0,'bulls'=0,'choice'=#a),'checked' = array) loop(4) => { if(#checked !>> integer(#a->values->get(loop_count))) => { #checked->insert(integer(#a->values->get(loop_count))) if(integer(#n->values->get(loop_count)) == integer(#a->values->get(loop_count))) => { #cowbull->find('bulls') += 1 else(#n->values >> #a->values->get(loop_count)) #cowbull->find('cows') += 1 } } } #cowbull->find('bulls') == 4 ? return (:true,map('cows'=0,'bulls'=4,'choice'=#a)) return (:true,#cowbull) } session_start('user') session_addvar('user', 'num') session_addvar('user', 'historic_choices') // set up rand var(num)->isNotA(::string) ? var(num = randomizer) var(historic_choices)->isNotA(::array) ? var(historic_choices = array) local(success = false) // check answer if(web_request->param('a')->asString->size) => { local(success,result) = cowbullchecker($num,web_request->param('a')->asString)
$historic_choices->insert(#result) } if(web_request->params->asStaticArray >> 'restart') => {$num = randomizer
$historic_choices = array } ] <h1>Bulls and Cows</h1> <p>Guess the 4-digit number...</p> <p>Your win if the guess is the same as the randomly chosen number. - A score of one bull is accumulated for each digit in your guess that equals the corresponding digit in the randomly chosen initial number. - A score of one cow is accumulated for each digit in your guess that also appears in the randomly chosen number, but in the wrong position. </p> [ local(win = false) if($historic_choices->size) => {
with c in $historic_choices do => {^ '<p>'+#c->find('choice')+': Bulls: '+#c->find('bulls')+', Cows: '+#c->find('cows') if(#c->find('bulls') == 4) => {^ ' - YOU WIN!' #win = true ^} '</p>' ^} } if(not #win) => {^ ] <form action="?" method="post"> <input name="a" value="[web_request->param('a')->asString]" size="5"> <input type="submit" name="guess"> <a href="?restart">Restart</a> </form> [else '<a href="?restart">Restart</a>' ^}]  {{out}} Game in progress: Bulls and Cows Guess the 4-digit number... Your win if the guess is the same as the randomly chosen number. - A score of one bull is accumulated for each digit in your guess that equals the corresponding digit in the randomly chosen initial number. - A score of one cow is accumulated for each digit in your guess that also appears in the randomly chosen number, but in the wrong position. 4567: Bulls: 0, Cows: 1 4567: Bulls: 0, Cows: 1 (input box) (submit button) Restart  {{out}} Game in to completion: Bulls and Cows Guess the 4-digit number... Your win if the guess is the same as the randomly chosen number. - A score of one bull is accumulated for each digit in your guess that equals the corresponding digit in the randomly chosen initial number. - A score of one cow is accumulated for each digit in your guess that also appears in the randomly chosen number, but in the wrong position. 1234: Bulls: 0, Cows: 2 1256: Bulls: 0, Cows: 1 1789: Bulls: 0, Cows: 1 1222: Bulls: 0, Cows: 0 3456: Bulls: 1, Cows: 2 3564: Bulls: 0, Cows: 3 3567: Bulls: 0, Cows: 2 8564: Bulls: 0, Cows: 2 3564: Bulls: 0, Cows: 3 4365: Bulls: 0, Cows: 3 5436: Bulls: 2, Cows: 1 5478: Bulls: 2, Cows: 0 5463: Bulls: 3, Cows: 0 5468: Bulls: 2, Cows: 0 5493: Bulls: 4, Cows: 0 - YOU WIN! Restart  ## Liberty BASIC  do while len( secret$) <4
c$=chr$( int( rnd( 1) *9) +49)
if not( instr( secret$, c$)) then secret$=secret$ +c$loop print " Secret number has been guessed.... "; secret$

guesses  =   0

[loop]
input " "; guess$guesses = guesses +1 r$       =score$( guess$, secret$) bulls =val( word$( r$, 1, ",")) cows =val( word$( r$, 2, ",")) print " Result: "; bulls; " bulls, and "; cows; " cows" print if guess$ =secret$then print " You won after "; guesses; " guesses!" print " You guessed it in "; guesses print " Thanks for playing!" wait end if goto [loop] end ' _____________________________________________________________ function check( i$) '   check =0 if no digit repeats, else =1
check =0
for i =1 to 3
for j =i +1 to 4
if mid$( i$, i, 1) =mid$( i$, j, 1) then check =1
next j
next i
end function

function score$( a$, b$) ' return as a csv string the number of bulls & cows. bulls = 0: cows = 0 for i = 1 to 4 c$ = mid$( a$, i, 1)
if mid$( b$, i, 1) = c$then bulls = bulls + 1 else if instr( b$, c$) <>0 and instr( b$, c$) <>i then cows = cows + 1 end if end if next i score$ =str$( bulls); ","; str$( cows)
end function

[quit]
close #w
end



{{works with|UCB Logo}}

to ok? :n
output (and [number? :n] [4 = count :n] [4 = count remdup :n] [not member? 0 :n])
end

to init
do.until [make "hidden random 10000] [ok? :hidden]
end

to guess :n
if not ok? :n [print [Bad guess! (4 unique digits, 1-9)]  stop]
localmake "bulls 0
localmake "cows  0
foreach :n [cond [
[[? = item # :hidden] make "bulls 1 + :bulls]
[[member?  ? :hidden] make "cows  1 + :cows ]
]]
(print :bulls "bulls, :cows "cows)
if :bulls = 4 [print [You guessed it!]]
end


## Lua

function ShuffleArray(array)
for i=1,#array-1 do
local t = math.random(i, #array)
array[i], array[t] = array[t], array[i]
end
end

function GenerateNumber()
local digits = {1,2,3,4,5,6,7,8,9}

ShuffleArray(digits)

return digits * 1000 +
digits *  100 +
digits *   10 +
digits
end

function IsMalformed(input)
local malformed = false

if #input == 4 then
for i=1,4 do
local digit = input:byte(i) - string.byte('0')
if digit < 1 or digit > 9 or already_used[digit] then
malformed = true
break
end
end
else
malformed = true
end

return malformed
end

math.randomseed(os.time())
math.randomseed(math.random(2^31-1)) -- since os.time() only returns seconds

print("\nWelcome to Bulls and Cows!")
print("")
print("The object of this game is to guess the random 4-digit number that the")
print("computer has chosen. The number is generated using only the digits 1-9,")
print("with no repeated digits. Each time you enter a guess, you will score one")
print("\"bull\" for each digit in your guess that matches the corresponding digit")
print("in the computer-generated number, and you will score one \"cow\" for each")
print("digit in your guess that appears in the computer-generated number, but is")
print("in the wrong position. Use this information to refine your guesses. When")
print("you guess the correct number, you win.");
print("")

quit = false

repeat
magic_number = GenerateNumber()
magic_string = tostring(magic_number) -- Easier to do scoring with a string
repeat
io.write("\nEnter your guess (or 'Q' to quit): ")
if user_input == 'Q' or user_input == 'q' then
quit = true
break
end

if not IsMalformed(user_input) then
if user_input == magic_string then
print("YOU WIN!!!")
else
local bulls, cows = 0, 0
for i=1,#user_input do
local find_result = magic_string:find(user_input:sub(i,i))

if find_result and find_result == i then
bulls = bulls + 1
elseif find_result then
cows = cows + 1
end
end
print(string.format("You scored %d bulls, %d cows", bulls, cows))
end
else
print("Malformed input. You must enter a 4-digit number with")
print("no repeated digits, using only the digits 1-9.")
end

until user_input == magic_string

if not quit then
io.write("\nPress <Enter> to play again or 'Q' to quit: ")
if user_input == 'Q' or user_input == 'q' then
quit = true
end
end

if quit then
print("\nGoodbye!")
end
until quit


## M2000 Interpreter


Module Game {
Malformed=lambda (a$)->{ =true if len(a$)<>4 then exit
n=0 : dummy=val(a$,"int",n) if n<>5 or dummy=0 then exit for i=1 to 9 if len(filter$(a$,str$(i,0)))<3 then break
next i
=false
}
BullsAndCows$=lambda$ (a$, b$, &ok) ->{
Def b, c
for i=1 to 4
if mid$(a$,i,1)=mid$(b$,i,1) then
b++
else.if instr(b$,mid$(a$,i,1))>0 then c++ end if next i ok=b=4 =format$("bulls {0}, cows {1}", b, c)
}
Random$=lambda$ ->{
def repl$, bank$, c$bank$="123456789"
for i=1 to 4
c$=mid$(bank$,random(1,len(bank$)),1)
bank$=filter$(bank$, c$)
repl$+=c$
next i
=repl$} target$=Random$() def boolean win=false, a$
do
do
Input "Next guess ";a%
a$=str$(a%,0)
if Malformed(a$) then Print "Malformed input, try again" else exit always Print BullsAndCows$(a$, target$, &win)
if win then exit
Print "Bad guess! (4 unique digits, 1-9)"
always
Print "You guess it"
}
Game



## Maple

BC := proc(n) #where n is the number of turns the user wishes to play before they quit
local target, win, numGuesses, guess, bulls, cows, i, err;
target := [0, 0, 0, 0]:
randomize(); #This is a command that makes sure that the numbers are truly randomized each time, otherwise your first time will always give the same result.
while member(0, target) or numelems({op(target)}) < 4 do #loop continues to generate random numbers until you get one with no repeating digits or 0s
target := [seq(parse(i), i in convert(rand(1234..9876)(), string))]: #a list of random numbers
end do:

win := false:
numGuesses := 0:
while win = false and numGuesses < n do #loop allows the user to play until they win or until a set amount of turns have passed
err := true;
while err do #loop asks for values until user enters a valid number
printf("Please enter a 4 digit integer with no repeating digits\n");
try#catches any errors in user input
guess := [seq(parse(i), i in readline())];
if hastype(guess, 'Not(numeric)', 'exclude_container') then
printf("Postive integers only! Please guess again.\n\n");
elif numelems(guess) <> 4 then
printf("4 digit numbers only! Please guess again.\n\n");
elif numelems({op(guess)}) < 4 then
printf("No repeating digits! Please guess again.\n\n");
elif member(0, guess) then
else
err := false;
end if;
catch:
end try;
end do:
numGuesses := numGuesses + 1;
printf("Guess %a: %a\n", numGuesses, guess);
bulls := 0;
cows := 0;
for i to 4 do #loop checks for bulls and cows in the user's guess
if target[i] = guess[i] then
bulls := bulls + 1;
elif member(target[i], guess) then
cows := cows + 1;
end if;
end do;
if bulls = 4 then
win := true;
printf("The number was %a.\n", target);
printf(StringTools[FormatMessage]("You won with %1 %{1|guesses|guess|guesses}.", numGuesses));
else
printf(StringTools[FormatMessage]("%1 %{1|Cows|Cow|Cows}, %2 %{2|Bulls|Bull|Bulls}.\n\n", cows, bulls));
end if;
end do:
if win = false and numGuesses >= n then
printf("You lost! The number was %a.\n", target);
end if;
return NULL;
end proc:


{{out}}


Please enter a 4 digit integer with no repeating digits
Guess 1: [1, 2, 3, 4]
1 Cow, 1 Bull.

Please enter a 4 digit integer with no repeating digits
Guess 2: [2, 3, 4, 5]
0 Cows, 1 Bull.

...



## Mathematica


digits=Last@FixedPointList[If[Length@Union@#==4,#,Table[Random[Integer,{1,9}],{4}]]&,{}]
codes=ToCharacterCode[StringJoin[ToString/@digits]];
Module[{r,bulls,cows},
While[True,
r=InputString[];
If[r===$Canceled,Break[], With[{userCodes=ToCharacterCode@r}, If[userCodes===codes,Print[r<>": You got it!"];Break[], If[Length@userCodes==Length@codes, bulls=Count[userCodes-codes,0];cows=Length@Intersection[codes,userCodes]-bulls; Print[r<>": "<>ToString[bulls]<>"bull(s), "<>ToString@cows<>"cow(s)."], Print["Guess four digits."]]]]]]]  Output:  {8, 2, 6, 1} 3432: 0 bull(s), 1 cow(s). Illegal input. 8261: You got it!  ## MATLAB function BullsAndCows % Plays the game Bulls and Cows as the "game master" % Create a secret number nDigits = 4; lowVal = 1; highVal = 9; digitList = lowVal:highVal; secret = zeros(1, 4); for k = 1:nDigits idx = randi(length(digitList)); secret(k) = digitList(idx); digitList(idx) = []; end % Give game information fprintf('Welcome to Bulls and Cows!\n') fprintf('Try to guess the %d-digit number (no repeated digits).\n', nDigits) fprintf('Digits are between %d and %d (inclusive).\n', lowVal, highVal) fprintf('Score: 1 Bull per correct digit in correct place.\n') fprintf(' 1 Cow per correct digit in incorrect place.\n') fprintf('The number has been chosen. Now it''s your moooooove!\n') gs = input('Guess: ', 's'); % Loop until user guesses right or quits (no guess) nGuesses = 1; while gs gn = str2double(gs); if isnan(gn) || length(gn) > 1 % Not a scalar fprintf('Malformed guess. Keep to valid scalars.\n') gs = input('Try again: ', 's'); else g = sprintf('%d', gn) - '0'; if length(g) ~= nDigits || any(g < lowVal) || any(g > highVal) || ... length(unique(g)) ~= nDigits % Invalid number for game fprintf('Malformed guess. Remember:\n') fprintf(' %d digits\n', nDigits) fprintf(' Between %d and %d inclusive\n', lowVal, highVal) fprintf(' No repeated digits\n') gs = input('Try again: ', 's'); else score = CountBullsCows(g, secret); if score(1) == nDigits fprintf('You win! Bully for you! Only %d guesses.\n', nGuesses) gs = ''; else fprintf('Score: %d Bulls, %d Cows\n', score) gs = input('Guess: ', 's'); end end end nGuesses = nGuesses+1; % Counts malformed guesses end end function score = CountBullsCows(guess, correct) % Checks the guessed array of digits against the correct array to find the score % Assumes arrays of same length and valid numbers bulls = guess == correct; cows = ismember(guess(~bulls), correct); score = [sum(bulls) sum(cows)]; end  {{out}} Welcome to Bulls and Cows! Try to guess the 4-digit number (no repeated digits). Digits are between 1 and 9 (inclusive). Score: 1 Bull per correct digit in correct place. 1 Cow per correct digit in incorrect place. The number has been chosen. Now it's your moooooove! Guess: 1234 Score: 0 Bulls, 2 Cows Guess: 2156 Score: 0 Bulls, 1 Cows Guess: 7819 Score: 0 Bulls, 1 Cows Guess: 3457 Score: 0 Bulls, 2 Cows Guess: hello Malformed guess. Keep to valid scalars. Try again: 1123 Malformed guess. Remember: 4 digits Between 1 and 9 inclusive No repeated digits Try again: 34567 Malformed guess. Remember: 4 digits Between 1 and 9 inclusive No repeated digits Try again: 4368 You win! Bully for you! Only 8 guesses.  ## MAXScript  numCount = 4 -- number of digits to use digits = #(1, 2, 3, 4, 5, 6, 7, 8, 9) num = "" while num.count < numCount and digits.count > 0 do ( local r = random 1 digits.count append num (digits[r] as string) deleteitem digits r ) digits = undefined numGuesses = 0 inf = "Rules: \n1. Choose only % unique digits in any combination"+\ " (0 can't be used).\n2. Only positive integers are allowed."+\ "\n3. For each digit that is in it's place, you get a bull,\n"+\ "\tand for each digit that is not in it's place, you get a cow."+\ "\n4. The game is won when your number matches the number I chose."+\ "\n\nPress [esc] to quit the game.\n\n" clearlistener() format inf num.count while not keyboard.escpressed do ( local userVal = getkbvalue prompt:"\nEnter your number: " if (userVal as string) == num do ( format "\nCorrect! The number is %. It took you % moves.\n" num numGuesses exit with OK ) local bulls = 0 local cows = 0 local badInput = false case of ( (classof userVal != integer): ( format "\nThe number must be a positive integer.\n" badInput = true ) ((userVal as string).count != num.count): ( format "\nThe number must have % digits.\n" num.count badInput = true ) ((makeuniquearray (for i in 1 to (userVal as string).count \ collect (userVal as string)[i])).count != (userVal as string).count): ( format "\nThe number can only have unique digits.\n" badInput = true ) ) if not badInput do ( userVal = userVal as string i = 1 while i <= userVal.count do ( for j = 1 to num.count do ( if userVal[i] == num[j] do ( if i == j then bulls += 1 else cows += 1 ) ) i += 1 ) numGuesses += 1 format "\nBulls: % Cows: %\n" bulls cows ) )  {{out}} OK Rules: 1. Choose only 4 unique digits in any combination (0 can't be used). 2. Only positive integers are allowed. 3. For each digit that is in it's place, you get a bull, and for each digit that is not in it's place, you get a cow. 4. The game is won when your number matches the number I chose. Press [esc] to quit the game. OK Enter your number: 2468 Bulls: 0 Cows: 2 Enter your number: 2448 The number can only have unique digits. Enter your number: 1357 Bulls: 0 Cows: 1  ## MiniScript MiniScript secret = range(1,9) secret.shuffle secret = secret[:4].join("") while true guess = input("Your guess? ").split("") if guess.len != 4 then print "Please enter 4 numbers, with no spaces." continue end if bulls = 0 cows = 0 for i in guess.indexes if secret[i] == guess[i] then bulls = bulls + 1 else if secret.indexOf(guess[i]) != null then cows = cows + 1 end if end for if bulls == 4 then print "You got it! Great job!" break end if print "You score " + bulls + " bull" + "s"*(bulls!=1) + " and " + cows + " cow" + "s"*(cows!=1) + "." end while  {{out}} Your guess? 2385 You score 0 bulls and 2 cows. Your guess? 2323 You score 0 bulls and 2 cows. Your guess? 2211 You score 2 bulls and 1 cow. ... Your guess? 8542 You score 3 bulls and 0 cows. Your guess? 8642 You got it! Great job!  ## MUMPS BullCow New bull,cow,guess,guessed,ii,number,pos,x Set number="",x=1234567890 For ii=1:1:4 Do . Set pos=$Random($Length(x))+1 . Set number=number_$Extract(x,pos)
. Set $Extract(x,pos)="" . Quit Write !,"The computer has selected a number that consists" Write !,"of four different digits." Write !!,"As you are guessing the number, ""bulls"" and ""cows""" Write !,"will be awarded: a ""bull"" for each digit that is" Write !,"placed in the correct position, and a ""cow"" for each" Write !,"digit that occurs in the number, but in a different place.",! Write !,"For a guess, enter 4 digits." Write !,"Any other input is interpreted as ""I give up"".",! Set guessed=0 For Do Quit:guessed . Write !,"Your guess: " Read guess If guess'?4n Set guessed=-1 Quit . Set (bull,cow)=0,x=guess . For ii=4:-1:1 If$Extract(x,ii)=$Extract(number,ii) Do . . Set bull=bull+1,$Extract(x,ii)=""
. . Quit
. For ii=1:1:$Length(x) Set:number[$Extract(x,ii) cow=cow+1
. Write !,"You guessed ",guess,". That earns you "
. If 'bull,'cow Write "neither bulls nor cows..." Quit
. If bull Write bull," bull" Write:bull>1 "s"
. If cow Write:bull " and " Write cow," cow" Write:cow>1 "s"
. Write "."
. If bull=4 Set guessed=1 Write !,"That's a perfect score."
. Quit
If guessed<0 Write !!,"The number was ",number,".",!
Quit
Do BullCow

The computer has selected a number that consists
of four different digits.

As you are guessing the number, "bulls" and "cows"
will be awarded: a "bull" for each digit that is
placed in the correct position, and a "cow" for each
digit that occurs in the number, but in a different place.

For a guess, enter 4 digits.
Any other input is interpreted as "I give up".

You guessed 1234. That earns you 1 cow.
You guessed 5678. That earns you 1 cow.
You guessed 9815. That earns you 1 cow.
You guessed 9824. That earns you 2 cows.
You guessed 9037. That earns you 1 bull and 2 cows.
You guessed 2789. That earns you 1 bull and 2 cows.
You guessed 2079. That earns you 1 bull and 3 cows.
You guessed 2709. That earns you 2 bulls and 2 cows.
You guessed 0729. That earns you 4 cows.
You guessed 2907. That earns you 4 bulls.
That's a perfect score.


## Nim

{{trans|Python}}

import random, strutils, rdstdin
randomize()

proc random(a: string): char = a[random(0..a.len)]

const
digits = "123456789"
size = 4

var digitsSet: set[char] = {}
for d in digits: digitsSet.incl d

var chosen = newString(size)
for i in 0..chosen.high: chosen[i] = random(digits)

echo """I have chosen a number from $# unique digits from 1 to 9 arranged in a random order. You need to input a$# digit, unique digit number as a guess at what I have chosen""".format(size, size)

var guesses = 0
while true:
inc guesses
var guess = ""
while true:
guess = readLineFromStdin("\nNext guess [$#]: ".format(guesses)).strip() if guess.len == size and allCharsInSet(guess, digitsSet): break echo "Problem, try again. You need to enter$# unique digits from 1 to 9".format(size)
if guess == chosen:
echo "\nCongratulations you guessed correctly in ",guesses," attempts"
break
var bulls, cows = 0
for i in 0 .. <size:
if guess[i] == chosen[i]: inc bulls
if guess[i] in chosen: inc cows
echo "  $# Bulls\n$# Cows".format(bulls, cows)


Sample output:

I have chosen a number from 4 unique digits from 1 to 9 arranged in a random order.
You need to input a 4 digit, unique digit number as a guess at what I have chosen
1195

Next guess : 79
Problem, try again. You need to enter 4 unique digits from 1 to 9

Next guess : 7983
0 Bulls
1 Cows

Next guess : 1293
2 Bulls
2 Cows

Next guess : 1193
3 Bulls
3 Cows

Next guess : 1195

Congratulations you guessed correctly in 4 attempts


## OCaml

let rec input () =
let s = read_line () in
try
if String.length s <> 4 then raise Exit;
String.iter (function
| '1'..'9' -> ()
| _ -> raise Exit
) s;
let t = [ s.; s.; s.; s. ] in
let _ = List.fold_left  (* reject entry with duplication *)
(fun ac b -> if List.mem b ac then raise Exit; (b::ac))
[] t in
List.map (fun c -> int_of_string (String.make 1 c)) t
with Exit ->
prerr_endline "That is an invalid entry. Please try again.";
input ()
;;

let print_score g t =
let bull = ref 0 in
List.iter2 (fun x y ->
if x = y then incr bull
) g t;
let cow = ref 0 in
List.iter (fun x ->
if List.mem x t then incr cow
) g;
cow := !cow - !bull;
Printf.printf "%d bulls, %d cows\n%!" !bull !cow
;;

let () =
Random.self_init ();
let rec mkgoal acc = function 4 -> acc
| i ->
let n = succ(Random.int 9) in
if List.mem n acc
then mkgoal acc i
else mkgoal (n::acc) (succ i)
in
let g = mkgoal [] 0 in
let found = ref false in
while not !found do
let t = input () in
if t = g
then found := true
else print_score g t
done;
print_endline "Congratulations you guessed correctly";
;;


## Oforth

: bullsAndCows
| numbers guess digits bulls cows |

ListBuffer new ->numbers
while(numbers size 4 <>) [ 9 rand dup numbers include ifFalse: [ numbers add ] else: [ drop ] ]

while(true) [
"Enter a number of 4 different digits between 1 and 9 : " print
digits asInteger isNull digits size 4 <> or ifTrue: [ "Number of four digits needed" println continue ]
digits map(#asDigit) ->guess

guess numbers zipWith(#==) occurrences(true) ->bulls
bulls 4 == ifTrue: [ "You won !" println return ]

guess filter(#[numbers include]) size bulls - ->cows
System.Out "Bulls = " << bulls << ", cows = " << cows << cr
] ;


## ooRexx

The solution at [[#Version_2|Rexx Version 2]] is a valid ooRexx program.

## Oz

declare
proc {Main}
Solution = {PickNUnique 4 {List.number 1 9 1}}

proc {Loop}
Guess = {EnterGuess}
in
{System.showInfo
{Bulls Guess Solution}#" bulls and "#
{Cows Guess Solution}#" cows"}
if Guess \= Solution then {Loop} end
end
in
{Loop}
{System.showInfo "You have won!"}
end

fun {Bulls Xs Sol}
{Length {Filter {List.zip Xs Sol Value.'=='} Id}}
end

fun {Cows Xs Sol}
{Length {Intersection Xs Sol}}
end

local
class TextFile from Open.file Open.text end
StdIn = {New TextFile init(name:stdin)}
in
fun {EnterGuess}
try
{System.printInfo "Enter your guess (e.g. \"1234\"): "}
S = {StdIn getS($)} in %% verify {Length S} = 4 {All S Char.isDigit} = true {FD.distinct S} %% assert there is no duplicate digit %% convert from digits to numbers {Map S fun {$ D} D-&0 end}
catch _ then
{EnterGuess}
end
end
end

fun {PickNUnique N Xs}
{FoldL {MakeList N}
fun {$Z _} {Pick {Diff Xs Z}}|Z end nil} end fun {Pick Xs} {Nth Xs {OS.rand} mod {Length Xs} + 1} end fun {Diff Xs Ys} {FoldL Ys List.subtract Xs} end fun {Intersection Xs Ys} {Filter Xs fun {$ X} {Member X Ys} end}
end

fun {Id X} X end
in
{Main}


## PARI/GP

This simple implementation expects guesses in the form [a,b,c,d].

bc()={
my(u,v,bulls,cows);
while(#vecsort(v=vector(4,i,random(9)+1),,8)<4,);
while(bulls<4,
u=input();
if(type(u)!="t_VEC"|#u!=4,next);
bulls=sum(i=1,4,u[i]==v[i]);
cows=sum(i=1,4,sum(j=1,4,i!=j&v[i]==u[j]));
print("You have "bulls" bulls and "cows" cows")
)
};


## Pascal

Program BullCow;

{$mode objFPC} uses Math, SysUtils; type TFourDigit = array[1..4] of integer; Procedure WriteFourDigit(fd: TFourDigit); { Write out a TFourDigit with no line break following. } var i: integer; begin for i := 1 to 4 do begin Write(fd[i]); end; end; Function WellFormed(Tentative: TFourDigit): Boolean; { Does the TFourDigit avoid repeating digits? } var current, check: integer; begin Result := True; for current := 1 to 4 do begin for check := current + 1 to 4 do begin if Tentative[check] = Tentative[current] then begin Result := False; end; end; end; end; Function MakeNumber(): TFourDigit; { Make a random TFourDigit, keeping trying until it is well-formed. } var i: integer; begin for i := 1 to 4 do begin Result[i] := RandomRange(1, 9); end; if not WellFormed(Result) then begin Result := MakeNumber(); end; end; Function StrToFourDigit(s: string): TFourDigit; { Convert an (input) string to a TFourDigit. } var i: integer; begin for i := 1 to Length(s) do begin StrToFourDigit[i] := StrToInt(s[i]); end; end; Function Wins(Num, Guess: TFourDigit): Boolean; { Does the guess win? } var i: integer; begin Result := True; for i := 1 to 4 do begin if Num[i] <> Guess[i] then begin Result := False; Exit; end; end; end; Function GuessScore(Num, Guess: TFourDigit): string; { Represent the score of the current guess as a string. } var i, j, bulls, cows: integer; begin bulls := 0; cows := 0; { Count the cows and bulls. } for i := 1 to 4 do begin for j := 1 to 4 do begin if (Num[i] = Guess[j]) then begin { If the indices are the same, that would be a bull. } if (i = j) then begin bulls := bulls + 1; end else begin cows := cows + 1; end; end; end; end; { Format the result as a sentence. } Result := IntToStr(bulls) + ' bulls, ' + IntToStr(cows) + ' cows.'; end; Function GetGuess(): TFourDigit; { Get a well-formed user-supplied TFourDigit guess. } var input: string; begin WriteLn('Enter a guess:'); ReadLn(input); { Must be 4 digits. } if Length(input) = 4 then begin Result := StrToFourDigit(input); if not WellFormed(Result) then begin WriteLn('Four unique digits, please.'); Result := GetGuess(); end; end else begin WriteLn('Please guess a four-digit number.'); Result := GetGuess(); end; end; var Num, Guess: TFourDigit; Turns: integer; begin { Initialize the randymnity. } Randomize(); { Make the secred number. } Num := MakeNumber(); WriteLn('I have a secret number. Guess it!'); Turns := 0; { Guess until the user gets it. } While True do begin Guess := GetGuess(); { Count each guess as a turn. } Turns := Turns + 1; { If the user won, tell them and ditch. } if Wins(Num, Guess) then begin WriteLn('You won in ' + IntToStr(Turns) + ' tries.'); Write('The number was '); WriteFourDigit(Num); WriteLn('!'); Exit; end else { Otherwise, score it and get a new guess. } begin WriteLn(GuessScore(Num, Guess)); end; end; end.  ## Perl use Data::Random qw(rand_set); use List::MoreUtils qw(uniq); my$size = 4;
my $chosen = join "", rand_set set => ["1".."9"], size =>$size;

print "I've chosen a number from $size unique digits from 1 to 9; you need to input$size unique digits to guess my number\n";

for ( my $guesses = 1; ;$guesses++ ) {
my $guess; while (1) { print "\nNext guess [$guesses]: ";
$guess = <STDIN>; chomp$guess;
checkguess($guess) and last; print "$size digits, no repetition, no 0... retry\n";
}
if ( $guess eq$chosen ) {
print "You did it in $guesses attempts!\n"; last; } my$bulls = 0;
my $cows = 0; for my$i (0 .. $size-1) { if ( substr($guess, $i, 1) eq substr($chosen, $i, 1) ) {$bulls++;
} elsif ( index($chosen, substr($guess, $i, 1)) >= 0 ) {$cows++;
}
}
print "$cows cows,$bulls bulls\n";
}

sub checkguess
{
my $g = shift; return uniq(split //,$g) == $size &&$g =~ /^[1-9]{$size}$/;
}


## Perl 6

{{trans|Python}}

{{works with|Rakudo|2015.12}}

my $size = 4; my @secret = pick$size, '1' .. '9';

for 1..* -> $guesses { my @guess; loop { @guess = (prompt("Guess$guesses: ") // exit).comb;
last if @guess == $size and all(@guess) eq one(@guess) & any('1' .. '9'); say 'Malformed guess; try again.'; } my ($bulls, $cows) = 0, 0; for ^$size {
when @guess[$_] eq @secret[$_] { ++$bulls; } when @guess[$_] eq any @secret { ++$cows; } } last if$bulls == $size; say "$bulls bulls, $cows cows."; } say 'A winner is you!';  ## Phix constant N = 4 function mask(integer ch) return power(2,ch-'1') end function function score(sequence guess, sequence goal) integer bits = 0, bulls = 0, cows = 0, b for i=1 to N do b = goal[i] if guess[i]=b then bulls += 1 else bits += mask(b) end if end for for i=1 to N do b = mask(guess[i]) if and_bits(bits,b)!=0 then cows += 1 bits -= b end if end for return {bulls, cows} end function procedure game() sequence tgt = shuffle("123456789")[1..N] integer attempt = 1, bulls = 0, cows sequence guess while bulls<N do while 1 do printf(1,"Enter a %d digit number using only the digits 1 to 9:",N) guess = trim(gets(0)) if length(guess)=N then exit end if if length(guess)=1 and lower(guess)="q" then puts(1,"\nthe secret number was:"&tgt) {} = wait_key() abort(0) end if printf(1," - length is not %d (enter q to give up)\n",N) end while {bulls, cows} = score(guess,tgt) printf(1," Guess %-2d (%s) bulls:%d cows:%d\n",{attempt,guess,bulls,cows}) attempt += 1 end while puts(1,"Well done!\n") end procedure game()  {{out}}  Enter a 4 digit number using only the digits 1 to 9:5739 Guess 1 (5739) bulls:0 cows:3 Enter a 4 digit number using only the digits 1 to 9:7193 Guess 2 (7193) bulls:2 cows:1 Enter a 4 digit number using only the digits 1 to 9:3495 Guess 3 (3495) bulls:0 cows:2 Enter a 4 digit number using only the digits 1 to 9:7983 Guess 4 (7983) bulls:3 cows:0 Enter a 4 digit number using only the digits 1 to 9:7963 Guess 5 (7963) bulls:3 cows:0 Enter a 4 digit number using only the digits 1 to 9:7923 Guess 6 (7923) bulls:4 cows:0 Well done!  ## PHP <?php$size = 4;

$chosen = implode(array_rand(array_flip(range(1,9)),$size));

echo "I've chosen a number from $size unique digits from 1 to 9; you need to input$size unique digits to guess my number\n";

for ($guesses = 1; ;$guesses++) {
while (true) {
echo "\nNext guess [$guesses]: ";$guess = rtrim(fgets(STDIN));
if (!checkguess($guess)) echo "$size digits, no repetition, no 0... retry\n";
else
break;
}
if ($guess ==$chosen) {
echo "You did it in $guesses attempts!\n"; break; } else {$bulls = 0;
$cows = 0; foreach (range(0,$size-1) as $i) { if ($guess[$i] ==$chosen[$i])$bulls++;
else if (strpos($chosen,$guess[$i]) !== FALSE)$cows++;
}
echo "$cows cows,$bulls bulls\n";
}
}

function checkguess($g) { global$size;
return count(array_unique(str_split($g))) ==$size &&
preg_match("/^[1-9]{{$size}}$/", $g); } ?>  ## PicoLisp (de ok? (N) (let D (mapcar 'format (chop N)) (and (num? N) (not (member 0 D)) (= 4 (length D)) (= D (uniq D)) D )) ) (de init-cows () (until (setq *Hidden (ok? (rand 1234 9876)))) ) (de guess (N) (let D (ok? N) (if D (let Bulls (cnt '= D *Hidden) (if (= 4 Bulls) " You guessed it!" (let Cows (- (cnt '((N) (member N *Hidden)) D) Bulls) (pack Bulls " bulls, " Cows " cows") ) ) ) " Bad guess! (4 unique digits, 1-9)" ) ) )  ## PowerShell  [int]$guesses = $bulls =$cows = 0
[string]$guess = "none" [string]$digits = ""

while ($digits.Length -lt 4) {$character = [char](49..57 | Get-Random)

if ($digits.IndexOf($character) -eq -1) {$digits +=$character}
}

Write-Host "nGuess four digits (1-9) using no digit twice.n" -ForegroundColor Cyan

while ($bulls -lt 4) { do {$prompt = "Guesses={0:0#}, Last='{1,4}', Bulls={2}, Cows={3}; Enter your guess" -f $guesses,$guess, $bulls,$cows
$guess = Read-Host$prompt

if ($guess.Length -ne 4) {Write-Host "nMust be a four-digit numbern" -ForegroundColor Red} if ($guess -notmatch "[1-9][1-9][1-9][1-9]") {Write-Host "nMust be numbers 1-9n"         -ForegroundColor Red}
}
until ($guess.Length -eq 4)$guesses += 1
$bulls =$cows = 0

for ($i = 0;$i -lt 4; $i++) {$character = $digits.Substring($i,1)

if ($guess.Substring($i,1) -eq $character) {$bulls += 1
}
else
{
if ($guess.IndexOf($character) -ge 0)
{
$cows += 1 } } } } Write-Host "nYou won after$($guesses - 1) guesses." -ForegroundColor Cyan  {{Out}}  Guess four digits (1-9) using no digit twice. Guesses=00, Last='none', Bulls=0, Cows=0; Enter your guess: 1234 Guesses=01, Last='1234', Bulls=0, Cows=3; Enter your guess: 2345 Guesses=02, Last='2345', Bulls=1, Cows=2; Enter your guess: 2346 Guesses=03, Last='2346', Bulls=1, Cows=1; Enter your guess: 2341 Guesses=04, Last='2341', Bulls=1, Cows=2; Enter your guess: 3241 Guesses=05, Last='3241', Bulls=0, Cows=3; Enter your guess: 4321 Guesses=06, Last='4321', Bulls=1, Cows=2; Enter your guess: 5321 Guesses=07, Last='5321', Bulls=2, Cows=2; Enter your guess: 5312 You won after 7 guesses.  ## Processing Produces both a console transcript and a GUI interface to the game. Creates a new game each time the guess is correct; tracks number of games won. IntDict score; StringList choices; StringList guess; StringList secret; int gamesWon = -1; void setup() { choices = new StringList("0", "1", "2", "3", "4", "5", "6", "7", "8", "9"); newGame(); } void newGame() { gamesWon++; choices.shuffle(); secret = new StringList(); for (int i=0; i<4; i++) { // selections secret.append(choices.get(i)); } newGuess(); println("\nsecret:", secret, "\n"); } void newGuess() { guess = new StringList(); score = null; } void draw() { background(0); text("Bulls & Cows " + gamesWon, 5, 20); for (int i=0; i<guess.size(); i++) { text(guess.get(i), 20*i+10, height/2); } if (score!=null) { text("bulls:" + score.get("bulls") + " cows:" + score.get("cows"), 10, height-20); } } void keyReleased() { if (score!=null && score.get("bulls")==4) newGame(); if (guess.size()==secret.size()) newGuess(); if (guess.hasValue(str(key))) newGuess(); if (key>=48 && key<=57) guess.append(str(key)); if (guess.size()==secret.size()) { score = checkScore(secret, guess); println("guess: ", guess, "\n", score, "wins:", gamesWon); } } IntDict checkScore(StringList secret, StringList guess) { IntDict result = new IntDict(); result.set("bulls", 0); result.set("cows", 0); for (int i=0; i<guess.size(); i++) { if (guess.get(i).equals(secret.get(i))) { result.add("bulls", 1); } else if (secret.hasValue(guess.get(i))) { result.add("cows", 1); } } return result; }  ## Prolog Works with SWI-Prolog 6.1.8 (for predicate '''foldl'''), module lambda, written by '''Ulrich Neumerkel''' found there http://www.complang.tuwien.ac.at/ulrich/Prolog-inedit/lambda.pl and module clpfd written by '''Markus Triska'''. :- use_module(library(lambda)). :- use_module(library(clpfd)). % Parameters of the server % length of the guess proposition(4). % Numbers of digits % 0 -> 8 digits(8). bulls_and_cows_server :- proposition(LenGuess), length(Solution, LenGuess), choose(Solution), repeat, write('Your guess : '), read(Guess), ( study(Solution, Guess, Bulls, Cows) -> format('Bulls : ~w Cows : ~w~n', [Bulls, Cows]), Bulls = LenGuess ; digits(Digits), Max is Digits + 1, format('Guess must be of ~w digits between 1 and ~w~n', [LenGuess, Max]), fail). choose(Solution) :- digits(Digits), Max is Digits + 1, repeat, maplist(\X^(X is random(Max) + 1), Solution), all_distinct(Solution), !. study(Solution, Guess, Bulls, Cows) :- proposition(LenGuess), digits(Digits), % compute the transformation 1234 => [1,2,3,4] atom_chars(Guess, Chars), maplist(\X^Y^(atom_number(X, Y)), Chars, Ms), % check that the guess is well formed length(Ms, LenGuess), maplist(\X^(X > 0, X =< Digits+1), Ms), % compute the digit in good place foldl(\X^Y^V0^V1^((X = Y->V1 is V0+1; V1 = V0)),Solution, Ms, 0, Bulls), % compute the digits in bad place foldl(\Y1^V2^V3^(foldl(\X2^Z2^Z3^(X2 = Y1 -> Z3 is Z2+1; Z3 = Z2), Ms, 0, TT1), V3 is V2+ TT1), Solution, 0, TT), Cows is TT - Bulls.  ## PureBasic Define.s secret, guess, c Define.i bulls, cows, guesses, i If OpenConsole() While Len(secret) < 4 c = Chr(Random(8) + 49) If FindString(secret, c, 1) = 0 secret + c EndIf Wend Repeat Print("Guess a 4-digit number with no duplicate digits: ") guess = Input() If Len(guess) = 0 Break ;break from loop EndIf isMalformedGuess = #False If Len(guess) <> 4 ;guess is too short isMalformedGuess = #True Else For i = 1 To 4 c = Mid(guess, i, 1) If Not FindString("123456789", c, 1) Or CountString(guess, c) <> 1 ;guess contains either non-digits or duplicate digits isMalformedGuess = #True Break ;break from For/Next loop EndIf Next EndIf If isMalformedGuess PrintN("** You should enter 4 different numeric digits that are each from 1 to 9!") Continue ;continue loop EndIf bulls = 0: cows = 0: guesses = guesses + 1 For i = 1 To 4 c = Mid(secret, i, 1) If Mid(guess, i, 1) = c bulls + 1 ElseIf FindString(guess, c, 1) cows + 1 EndIf Next Print( Str(bulls) + " bull") If bulls <> 1 Print( "s") EndIf Print( ", " + Str(cows) + " cow") If cows <> 1 PrintN( "s") Else PrintN("") EndIf If guess = secret PrintN("You won after " + Str(guesses) + " guesses!") Break ;break from loop EndIf ForEver Print(#CRLF$ + #CRLF$+ "Press ENTER to exit") Input() CloseConsole() EndIf  ## Python ''' Bulls and cows. A game pre-dating, and similar to, Mastermind. ''' import random digits = '123456789' size = 4 chosen = ''.join(random.sample(digits,size)) #print chosen # Debug print '''I have chosen a number from %s unique digits from 1 to 9 arranged in a random order. You need to input a %i digit, unique digit number as a guess at what I have chosen''' % (size, size) guesses = 0 while True: guesses += 1 while True: # get a good guess guess = raw_input('\nNext guess [%i]: ' % guesses).strip() if len(guess) == size and \ all(char in digits for char in guess) \ and len(set(guess)) == size: break print "Problem, try again. You need to enter %i unique digits from 1 to 9" % size if guess == chosen: print '\nCongratulations you guessed correctly in',guesses,'attempts' break bulls = cows = 0 for i in range(size): if guess[i] == chosen[i]: bulls += 1 elif guess[i] in chosen: cows += 1 print ' %i Bulls\n %i Cows' % (bulls, cows)  Sample output: I have chosen a number from 4 unique digits from 1 to 9 arranged in a random order. You need to input a 4 digit, unique digit number as a guess at what I have chosen Next guess : 79 Problem, try again. You need to enter 4 unique digits from 1 to 9 Next guess : 7983 2 Bulls 2 Cows Next guess : 7938 Congratulations you guessed correctly in 2 attempts  ## R {{works with|R|2.8.1}} target <- sample(1:9,4) bulls <- 0 cows <- 0 attempts <- 0 while (bulls != 4) { input <- readline("Guess a 4-digit number with no duplicate digits or 0s: ") if (nchar(input) == 4) { input <- as.integer(strsplit(input,"")[]) if ((sum(is.na(input)+sum(input==0))>=1) | (length(table(input)) != 4)) {print("Malformed input!")} else { bulls <- sum(input == target) cows <- sum(input %in% target)-bulls cat("\n",bulls," Bull(s) and ",cows, " Cow(s)\n") attempts <- attempts + 1 } } else {print("Malformed input!")} } print(paste("You won in",attempts,"attempt(s)!"))  ## Racket  #lang racket ; secret : (listof exact-nonnegative-integer?) (define secret (foldr (λ (n result) (cons n (map (λ (y) (if (>= y n) (add1 y) y)) result))) '() (map random '(10 9 8 7)))) ; (count-bulls/cows guess) -> (values exact-nonnegative-integer? ; exact-nonnegative-integer?) ; guess : (listof exact-nonnegative-integer?) (define (count-bulls/cows guess) (let* ([bulls (map = guess secret)] [cow-candidates (filter-map (λ (x y) (if (false? x) y #f)) bulls secret)] [cows (filter (curryr member cow-candidates) guess)]) (values (length (filter ((curry equal?) #t) bulls)) (length cows)))) ; (valid-guess guess-str) -> (or/c (listof exact-nonnegative-integer?) #f) ; guess-str : string? (define (valid-guess guess-str) (define (char->digit c) (- (char->integer c) (char->integer #\0))) (if (regexp-match-exact? #px"[0-9]{4}" guess-str) (let ([guess (map char->digit (string->list guess-str))]) (if (andmap (λ (x) (equal? (count ((curry equal?) x) guess) 1)) guess) guess #f)) #f)) ; Game states (define win #t) (define game #f) ; (main-loop state step) -> void? ; state : boolean? ; step : exact-nonnegative-integer? (define (main-loop state step) (if (equal? state win) (printf "You won after ~a guesses." step) (begin (let* ([guess-str (read-line)] [guess (valid-guess guess-str)]) (if (false? guess) (begin (displayln "Guess should include exactly four different digits") (main-loop state step)) (let-values ([(bulls cows) (count-bulls/cows guess)]) (if (= bulls 4) (main-loop win (add1 step)) (begin (printf "Bulls: ~a Cows: ~a\n" bulls cows) (main-loop state (add1 step)))))))))) (main-loop game 0)  Output:  1234 Bulls: 0 Cows: 1 21345 Guess should include exactly four different digits 2134 Bulls: 1 Cows: 0 2314 Bulls: 0 Cows: 1 5167 Bulls: 1 Cows: 1 5189 Bulls: 1 Cows: 2 0189 Bulls: 1 Cows: 2 8179 Bulls: 1 Cows: 3 7198 You won after 8 guesses.  ## Red  Red[] a: "0123456789" bulls: 0 random/seed now/time number: copy/part random a 4 while [bulls <> 4] [ bulls: 0 cows: 0 guess: ask "make a guess: " repeat i 4 [ if (pick guess i) = (pick number i) [bulls: bulls + 1] ] cows: (length? intersect guess number) - bulls print ["bulls: " bulls " cows: " cows] ] print "You won!"  ## REXX This game is also known as: :::::::* Pigs and Bulls :::::::* Bulls and Cleots :::::::* Mastermind :::::::* Master Mind ### version 1 This REXX version of Bulls and Cows doesn't allow repeated digits (in the computer-generated number), nor the use of the zero digit. To allow a zero digit, change the '''1''' on the 2nd REXX statement for the '''random''' BIF invocation. To allow repeated digits in the computer-generated number, delete the 3rd REXX statement '''if pos(r, ?)···''', and also change the prompt message. The REXX statement that contains the '''translate''' statement can be removed if repeated digits aren't allowed. /*REXX program scores the Bulls & Cows game with CBLFs (Carbon Based Life Forms). */ ?=; do until length(?)==4; r=random(1, 9) /*generate a unique four-digit number. */ if pos(r, ?)\==0 then iterate /*don't allow a repeated digit/numeral.*/ ?=? || r /*add random digit by concatenation. */ end /*until length ···*/ /* [↑] builds a unique four-digit num.*/$= '──────── [Bulls & Cows]  '
do  until  bulls==4;      say            /*play until guessed  or enters "QUIT".*/
say $'Please enter a 4-digit guess (with no zeroes) [or Quit]:' pull n; n=space(n, 0); if abbrev('QUIT', n, 1) then exit /*wants to quit ?*/ q=?; L=length(n); bulls=0; cows=0 /*initialize some REXX variables. */ do j=1 for L; if substr(n, j, 1)\==substr(q, j, 1) then iterate /*bull?*/ bulls=bulls +1; q=overlay(., q, j) /*bump bull count; disallow for cow.*/ end /*j*/ /* [↑] bull count────────~─────────*/ /*cow ?*/ do k=1 for L; _=substr(n, k, 1); if pos(_, q)==0 then iterate cows=cows + 1; q=translate(q, , _) /*bump cow count; allow mult digits.*/ end /*k*/ /* [↑] cow count─────────~────────*/ say; @= 'You got' bulls if L\==0 & bulls\==4 then say$  @  'bull's(bulls)   "and"   cows   'cow's(cows).
end   /*until bulls==4*/
say
say "          ┌─────────────────────────────────────────┐"
say "          │                                         │"
say "          │  Congratulations, you've guessed it !!  │"
say "          │                                         │"
say "          └─────────────────────────────────────────┘";     say
exit                                             /*stick a fork in it,  we're all done. */
/*──────────────────────────────────────────────────────────────────────────────────────*/
s:  if arg(1)==1  then return '';   return "s"   /*this function handles pluralization. */


### Version 2


/*REXX program to play the game of  "Bulls & Cows". *******************
* Changes from Version 1:
* ?= -> qq='' (righthandside mandatory and I never use ? as symbol -
*                               although it is available on all Rexxes)
* implemented singular/plural distinction differently
* change getRand to avoid invalid digit rejection
* check user's input for multiple digits
* add feature MM to ease guessing (MM=Mastermind - a similar game)
* add feature ? to see the solution (for the impatient player)
* program runs as is on ooRexx and on TSO (after changing | to !)
* Made source and output more compact
* formatted source 'my way'  2 July 2012 Walter Pachl
**********************************************************************/

b.='bulls'; b.1='bull'
c.='cows';  c.1='cow'
qq=getRand()
mm=0
Do Forever
If get_guess()==qq Then leave
Call scorer
Say "You got" bulls b.bulls "and" cows c.cows"."
If mm Then
Say mms
End   /*forever*/
Say "         *******************************************"
Say "         *                                         *"
Say "         *  Congratulations, you've guessed it !!  *"
Say "         *                                         *"
Say "         *******************************************"
Exit

get_guess:                           /*get a guess from the guesser. */

do forever
Parse Pull guessi
guess=translate(guessi)
bc=verify(guess,987654321)
Select
When guess='?'       Then Say qq 'is the correct sequence'
When guess='QUIT'    Then Exit
When guess='MM'      Then Do
Say 'Mastermind output enabled'
mm=1
End
When guess=''        Then Call ser 'no argument specified.'
When words(guess)>1  Then Call ser 'too many arguments specified.'
When verify(0,guess)=0 Then Call ser 'illegal digit: 0'
When bc>0 Then Call ser 'illegal character:' substr(guessi,bc,1)
When length(guess)<4 Then Call ser 'not enough digits'
When length(guess)>4 Then Call ser 'too many digits'
When dups(guess)     Then Call ser '4 DIFFERENT digits, please'
Otherwise Do
/********** Say guess ************/
Return guess
End
End
End

getRand:
digits='123456789'
qq=''
Do i=1 To 4
d=random(1,length(digits))
d=substr(digits,d,1)
qq=qq||d
digits=space(translate(digits,' ',d),0)
/************ Say qq digits ************/
End
Return qq

scorer: g=qq
mms='----'
bulls=0
Do j=1 for 4
If substr(guess,j,1)=substr(qq,j,1) Then Do
bulls=bulls+1
guess=overlay(' ',guess,j)
mms=overlay('+',mms,j)
End
End
cows=0
Do j=1 To 4
If pos(substr(guess,j,1),qq)>0 Then Do
cows=cows+1
mms=overlay('.',mms,j)
End
End
Return

dups: Procedure
Parse Arg s
Do i=1 To 3
If pos(substr(s,i,1),substr(s,i+1))>0 Then
Return 1
End
Return 0

ser: Say '*** error ***' arg(1); Return



## Ring


# Project : Bulls and cows

secret = ""
while len(secret) != 4
c = char(48 + random(9))
if substr(secret, c) = 0
secret = secret + c
ok
end

see "guess a four-digit number with no digit used twice."
guesses = 0
guess = ""
while true
guess = ""
while len(guess) != 4
give guess
if len(guess) != 4
see "must be a four-digit number" + nl
ok
end
guesses = guesses + 1
if guess = secret
see "you won after " + guesses + " guesses!"
exit
ok
bulls = 0
cows = 0
for i = 1 to 4
c = secret[i]
if guess[i] = c
bulls = bulls + 1
but substr(guess, c) > 0
cows = cows + 1
ok
next
see "you got " + bulls + " bull(s) and " + cows + " cow(s)." + nl
end



## Ruby

Inspired by Tcl {{works with|Ruby|1.8.7+}}

def generate_word(len)
[*"1".."9"].shuffle.first(len)        # [*"1".."9"].sample(len)  ver 1.9+
end

def get_guess(len)
loop do
print "Enter a guess: "
guess = gets.strip
err = case
when guess.match(/[^1-9]/)             ; "digits only"
when guess.length != len               ; "exactly #{len} digits"
when guess.split("").uniq.length != len; "digits must be unique"
else return guess.split("")
end
puts "the word must be #{len} unique digits between 1 and 9 (#{err}). Try again."
end
end

def score(word, guess)
bulls = cows = 0
guess.each_with_index do |num, idx|
if word[idx] == num
bulls += 1
elsif word.include? num
cows += 1
end
end
[bulls, cows]
end

word_length = 4
puts "I have chosen a number with #{word_length} unique digits from 1 to 9."
word = generate_word(word_length)
count = 0
loop do
guess = get_guess(word_length)
count += 1
break if word == guess
puts "that guess has %d bulls and %d cows" % score(word, guess)
end
puts "you guessed correctly in #{count} tries."


Inspired by Python {{works with|Ruby|2.0+}}

size = 4
secret = [*'1' .. '9'].sample(size)
guess = nil

i=0
loop do
i+=1
loop do
print "Guess #{i}: "
guess = gets.chomp.chars
exit if guess.empty?

break if guess.size == size and
guess.all? { |x| ('1'..'9').include? x } and
guess.uniq.size == size

puts "Problem, try again. You need to enter #{size} unique digits from 1 to 9"
end

if guess == secret
puts "Congratulations you guessed correctly in #{i} attempts"
break
end

bulls = cows = 0
size.times do |j|
if guess[j] == secret[j]
bulls += 1
elsif secret.include? guess[j]
cows += 1
end
end

puts "Bulls: #{bulls}; Cows: #{cows}"
end


## Rust

use std::io;

extern crate rand;

const NUMBER_OF_DIGITS: usize = 4;

static DIGITS: [char; 9] = ['1', '2', '3', '4', '5', '6', '7', '8', '9'];

fn generate_digits() -> Vec<char> {
let mut temp_digits: Vec<_> = (&DIGITS[..]).into();
return temp_digits.iter().take(NUMBER_OF_DIGITS).map(|&a| a).collect();
}

fn parse_guess_string(guess: &str) -> Result<Vec<char>, String> {
let chars: Vec<char> = (&guess).chars().collect();

if !chars.iter().all(|c| DIGITS.contains(c)) {
}

if chars.len() != NUMBER_OF_DIGITS {
return Err(format!("you need to guess with {} digits", NUMBER_OF_DIGITS));
}

let mut uniques: Vec<char> = chars.clone();
uniques.dedup();
if uniques.len() != chars.len() {
}

return Ok(chars);
}

fn calculate_score(given_digits: &[char], guessed_digits: &[char]) -> (usize, usize) {
let mut bulls = 0;
let mut cows = 0;
for i in 0..NUMBER_OF_DIGITS {
let pos: Option<usize> = guessed_digits.iter().position(|&a| -> bool {a == given_digits[i]});
match pos {
None              => (),
Some(p) if p == i => bulls += 1,
Some(_)           => cows += 1
}
}
return (bulls, cows);
}

fn main() {

loop {
let given_digits = generate_digits();
println!("I have chosen my {} digits. Please guess what they are", NUMBER_OF_DIGITS);

loop {
let guess_string: String = {
let mut buf = String::new();
buf.trim().into()
};

let digits_maybe = parse_guess_string(&guess_string);
match digits_maybe {
Err(msg) => {
println!("{}", msg);
continue;
},
Ok(guess_digits) => {
match calculate_score(&given_digits, &guess_digits) {
(NUMBER_OF_DIGITS, _) => {
println!("you win!");
break;
},
(bulls, cows) => println!("bulls: {}, cows: {}", bulls, cows)
}
}
}
}
}
}


## Scala

import scala.util.Random

object BullCow {
def main(args: Array[String]): Unit = {
val number=chooseNumber
var guessed=false
var guesses=0

while(!guessed){
Console.print("Guess a 4-digit number with no duplicate digits: ")
val digits=input.toString.map(_.asDigit).toList
if(input>=1111 && input<=9999 && !hasDups(digits)){
guesses+=1
var bulls, cows=0
for(i <- 0 to 3)
if(number(i)==digits(i))
bulls+=1
else if(number.contains(digits(i)))
cows+=1

if(bulls==4)
guessed=true
else
println("%d Cows and %d Bulls.".format(cows, bulls))
}
}
println("You won after "+guesses+" guesses!");
}

def chooseNumber={
var digits=List[Int]()
while(digits.size<4){
val d=Random.nextInt(9)+1
if (!digits.contains(d))
digits=digits:+d
}
digits
}

def hasDups(input:List[Int])=input.size!=input.distinct.size
}


## Scheme

{{works with|any R6RS Scheme}}



;generate a random non-repeating list of 4 digits, 1-9 inclusive
(define (get-num)
(define (gen lst)
(if (= (length lst) 4) lst
(let ((digit (+ (random 9) 1)))
(if (member digit lst) ;make sure the new digit isn't in the
;list
(gen lst)
(gen (cons digit lst))))))
(string->list (apply string-append (map number->string (gen '())))))

;is g a valid guess (that is, non-repeating, four digits 1-9
;inclusive?)
(define (valid-guess? g)
(let ((g-num (string->number (apply string g))))
;does the same digit appear twice in lst?
(define (repeats? lst)
(cond ((null? lst) #f)
((member (car lst) (cdr lst)) #t)
(else (repeats? (cdr lst)))))
(and g-num
(> g-num 1233)
(< g-num 9877)
(not (repeats? g)))))

;return '(cows bulls) for the given guess
;total cows + bulls
(define (cows&bulls a g)
(cond ((null? a) 0)
((member (car a) g) (+ 1 (cows&bulls (cdr a) g)))
(else (cows&bulls (cdr a) g))))
;bulls only
(define (bulls a g)
(cond ((null? a) 0)
((equal? (car a) (car g)) (+ 1 (bulls (cdr a) (cdr g))))
(else (bulls (cdr a) (cdr g)))))

;play the game
;get the user's guess as a list
(define (get-guess)
(if (number? e)
(string->list (number->string e))
(string->list (symbol->string e)))))
(display "Enter a guess: ")
(let ((guess (get-guess)))
(if (valid-guess? guess)
(if (= bulls 4)
(display "You win!\n")
(begin
(display bulls)
(display " bulls, ")
(display cows)
(display " cows.\n")
(begin
(display "Invalid guess.\n")

(bull-cow (get-num))



### Sample game play


Enter a guess: 1234
0 bulls, 1 cows.
Enter a guess: 2345
1 bulls, 0 cows.
Enter a guess: 2346
1 bulls, 1 cows.
Enter a guess: 2367
0 bulls, 1 cows.
Enter a guess: 2647
1 bulls, 1 cows.
Enter a guess: 2648
2 bulls, 1 cows.
Enter a guess: 2468
1 bulls, 2 cows.
Enter a guess: 1468
1 bulls, 2 cows.
Enter a guess: 2684
0 bulls, 3 cows.
Enter a guess: 6248
3 bulls, 0 cows.
Enter a guess: 6948
You win!



$include "seed7_05.s7i"; const proc: main is func local const integer: size is 4; var set of char: digits is {'1' .. '9'}; var string: chosen is " " mult size; var integer: guesses is 0; var string: guess is ""; var integer: pos is 0; var integer: bulls is 0; var integer: cows is 0; var boolean: okay is FALSE; begin for pos range 1 to 4 do chosen @:= [pos] rand(digits); excl(digits, chosen[pos]); end for; writeln("I have chosen a number from " <& size <& " unique digits from 1 to 9 arranged in a random order."); writeln("You need to input a " <& size <& " digit, unique digit number as a guess at what I have chosen"); repeat incr(guesses); repeat write("Next guess [" <& guesses <& "]: "); readln(guess); okay := length(guess) = size; for key pos range guess do okay := okay and guess[pos] in {'1' .. '9'} and pos(guess[succ(pos) ..], guess[pos]) = 0; end for; if not okay then writeln("Problem, try again. You need to enter " <& size <& " unique digits from 1 to 9"); end if; until okay; if guess <> chosen then bulls := 0; cows := 0; for key pos range chosen do if guess[pos] = chosen[pos] then incr(bulls); elsif pos(chosen, guess[pos]) <> 0 then incr(cows); end if; end for; writeln(" " <& bulls <& " Bulls"); writeln(" " <& cows <& " Cows"); end if; until guess = chosen; writeln("Congratulations you guessed correctly in " <& guesses <& " attempts"); end func;  {{out}}  I have chosen a number from 4 unique digits from 1 to 9 arranged in a random order. You need to input a 4 digit, unique digit number as a guess at what I have chosen Next guess : 1234 1 Bulls 0 Cows Next guess : 1567 1 Bulls 2 Cows Next guess : 1856 3 Bulls 0 Cows Next guess : 1956 Congratulations you guessed correctly in 4 attempts  ## Sidef var size = 4 var num = @(1..9).shuffle.first(size) for (var guesses = 1; true; guesses++) { var bulls = 0 var cows = 0 var input = read("Input: ", String).chars \ .uniq \ .grep(/^[1-9]$/) \
.map{.to_n}

if (input.len != size) {
warn "Invalid input!\n"
guesses--
next
}

if (input == num) {
printf("You did it in %d attempts!\n", guesses)
break
}

for i (^num) {
if (num[i] == input[i]) {
bulls++
}
elsif (num.contains(input[i])) {
cows++
}
}

"Bulls: %d; Cows: %d\n".printf(bulls, cows)
}


{{out}}


Input: 2953
Bulls: 1; Cows: 1
Input: 9654
Bulls: 1; Cows: 1
Input: 8924
Bulls: 1; Cows: 3
Input: 2894
You did it in 4 attempts!



## Smalltalk

{{works with|GNU Smalltalk}}

Object subclass: BullsCows [
|number|
BullsCows class >> new: secretNum [ |i|
i := self basicNew.
(self isValid: secretNum)
ifFalse: [ SystemExceptions.InvalidArgument
signalOn: secretNum
reason: 'You need 4 unique digits from 1 to 9' ].
i setNumber: secretNum.
^ i
]
BullsCows class >> new [ |b| b := Set new.
[ b size < 4 ]
whileTrue: [ b add: ((Random between: 1 and: 9) displayString first) ].
^ self new: (b asString)
]
BullsCows class >> isValid: num [
^ (num asSet size = 4) & ((num asSet includes: $0) not) ] setNumber: num [ number := num ] check: guess [ |bc| bc := Bag new. 1 to: 4 do: [ :i | (number at: i) = (guess at: i) ifTrue: [ bc add: 'bulls' ] ifFalse: [ (number includes: (guess at: i)) ifTrue: [ bc add: 'cows' ] ] ]. ^ bc ] ]. 'Guess the 4-digits number (digits from 1 to 9, no repetition)' displayNl. |guessMe d r tries| [ tries := 0. guessMe := BullsCows new. [ [ 'Write 4 digits: ' display. d := stdin nextLine. (BullsCows isValid: d) ] whileFalse: [ 'Insert 4 digits, no repetition, exclude the digit 0' displayNl ]. r := guessMe check: d. tries := tries + 1. (r occurrencesOf: 'bulls') = 4 ] whileFalse: [ ('%1 cows, %2 bulls' % { r occurrencesOf: 'cows'. r occurrencesOf: 'bulls' }) displayNl. ]. ('Good, you guessed it in %1 tries!' % { tries }) displayNl. 'Do you want to play again? [y/n]' display. ( (stdin nextLine) = 'y' ) ] whileTrue: [ Character nl displayNl ].  ## Smart BASIC  'by rbytes, January 2017 OPTION BASE 1 P(" B U L L S A N D C O W S")!l P("A secret 4-digit number has been created, with") P("no repeats and no zeros. You must guess the number.") P("After each guess, you will be shown how many of your") P("digits are correct and in the matching location (bulls),") P("and how many are correct but in a different location (cows).") p("See how many tries it takes you to get the right answer.") ' generate a 4-digit number with no repeats guesses = 0 1 WHILE LEN(sec$) <4
c$=CHR$( INTEG(RND(1) *9) +49)
IF INSTR(sec$, c$)=-1 THEN sec$&=c$
ENDWHILE!l
INPUT "FOUR DIGITS": guess$!l IF guess$="" THEN       ' check if entry is null
GOTO 2
ENDIF
P(guess$)!l IF LEN(guess$)<>4 THEN  ' check if entry is exactly 4 characters
GOTO 2
ENDIF
FOR t=1 TO 4            ' check if all characters are digits 1 - 9
IF INSTR("123456789",MID$(guess$,t,1))=-1 THEN
P("You have entered at least one illegal character")!l
GOTO 2
ENDIF
NEXT t
rep = check(guess$) ' check if any digits are repeated IF check.chk THEN P("Please enter a number with no repeated digits.")!l GOTO 2 ENDIF guesses+=1 r$=score$(guess$,sec$) P(r$)!l

IF guess$=sec$ THEN
P("W I N N E R ! ! !")!l
IF guesses>1 THEN gs$="guesses!" ELSE gs$="guess!"
P("You won after "&guesses&" "&gs$) P("Thanks for playing!")!l PAUSE 2 P("A G A I N with a new secret number")!l guesses=0 END IF GOTO 1 END ' _____________________________________________________________ DEF P(p$)              ' function to print a string
PRINT p$END DEF DEF L() ' function to print an empty line PRINT END DEF DEF check(i$)          ' check=0 if digit is not repeated, else=1
chk=0
FOR i =1 TO 3
FOR j =i +1 TO 4
IF MID$( i$, i, 1)=MID$( i$, j, 1) THEN chk =1
NEXT j
NEXT i
END DEF

DEF score$(a$,b$) ' calculate the numbers of bulls & cows. bulls=0!cows=0 FOR i = 1 TO 4 c$ = MID$( a$, i, 1)
IF MID$( b$, i, 1)=c$THEN bulls+=1 ELSE IF INSTR( b$, c$) <>-1 AND INSTR( b$, c$) <>i THEN cows+=1 END IF END IF NEXT i r$ ="Bulls: "&STR$( bulls)& ", "& "Cows: " &STR$( cows)
RETURN r$END DEF END </Lang> ## Swift swift import Foundation func generateRandomNumArray(numDigits: Int = 4) -> [Int] { guard numDigits > 0 else { return [] } let needed = min(9, numDigits) var nums = Set<Int>() repeat { nums.insert(.random(in: 1...9)) } while nums.count != needed return Array(nums) } func parseGuess(_ guess: String) -> [Int]? { guard guess.count == 4 else { return nil } let guessArray = guess.map(String.init).map(Int.init).compactMap({$0 })

guard Set(guessArray).count == 4 else {
return nil
}

return guessArray
}

while true {
let num = generateRandomNumArray()
var bulls = 0
var cows = 0

print("Please enter a 4 digit number with digits between 1-9, no repetitions: ")

guard let guessStr = readLine(strippingNewline: true), let guess = parseGuess(guessStr) else {
print("Invalid input")
continue
}

for (guess, actual) in zip(guess, num) {
if guess == actual {
bulls += 1
} else if num.contains(guess) {
cows += 1
}
}

print("Actual number: \(num.map(String.init).joined())")
print("Your score: \(bulls) bulls and \(cows) cows\n")
print("Would you like to play again? (y): ")

guard readLine(strippingNewline: true)!.lowercased() == "y" else {
exit(0)
}
}


{{out}}

Please enter a 4 digit number with digits between 1-9, no repetitions:
8496
Actual number: 6475
Your score: 1 bulls and 1 cows

Would you like to play again? (y):
y
Please enter a 4 digit number with digits between 1-9, no repetitions:
5983
Actual number: 7846
Your score: 0 bulls and 1 cows



## Tcl

proc main {} {
fconfigure stdout -buffering none
set length 4

puts "I have chosen a number from $length unique digits from 1 to 9 arranged in a random order. You need to input a$length digit, unique digit number as a guess at what I have chosen
"

while true {
set word [generateWord $length] set count 1 while {[set guess [getGuess$length]] ne $word} { printScore$length $word$guess
incr count
}
puts "You guessed correctly in $count tries." if {[yn "Play again?"] eq "n"} break } } proc generateWord {length} { set chars 123456789 for {set i 1} {$i <= $length} {incr i} { set idx [expr {int(rand() * [string length$chars])}]
append word [string index $chars$idx]
set chars [string replace $chars$idx $idx] } return$word

# here's another way to generate word with no duplications
set word ""
while {[string length $word] <$length} {
set char [expr {int(1 + 9*rand())}]
if {[string first $char$word] == -1} {
append word $char } } } proc getGuess {length} { puts -nonewline "Enter your guess: " while true { gets stdin guess if {[string match [string repeat {[1-9]}$length] $guess]} { return$guess
}
if {[string tolower [string trim $guess]] eq "quit"} { puts Bye exit } puts "The word must be$length digits between 1 and 9 inclusive.  Try again."
}
}

proc printScore {length word guess} {
set bulls 0
set cows 0
for {set i 0} {$i <$length} {incr i} {
if {[string index $word$i] eq [string index $guess$i]} {
incr bulls
set word [string replace $word$i $i +] } } puts "$bulls bulls"
for {set i 0} {$i <$length} {incr i} {
if {[set j [string first [string index $guess$i] $word]] != -1} { incr cows set word [string replace$word $j$j -]
}
}
puts "  $cows cows" } proc yn {msg} { while true { puts -nonewline "$msg \[y/n] "
gets stdin ans
set char [string tolower [string index [string trim $ans] 0]] if {$char eq "y" || $char eq "n"} { return$char
}
}
}

main


## TUSCRIPT


 MODE tuscript
SET nr1=RANDOM_NUMBERS (1,9,1)
LOOP
SET nr2=RANDOM_NUMBERS (1,9,1)
IF (nr2!=nr1) EXIT
ENDLOOP
LOOP
SET nr3=RANDOM_NUMBERS (1,9,1)
IF (nr3!=nr1,nr2) EXIT
ENDLOOP
LOOP
SET nr4=RANDOM_NUMBERS (1,9,1)
IF (nr4!=nr1,nr2,nr3) EXIT
ENDLOOP
SET nr=JOIN(nr1,"'",nr2,nr3,nr4), limit=10
LOOP r=1,limit
SET bulls=cows=0
ASK "round {r} insert a number":guessnr=""
SET length=LENGTH(guessnr), checknr=STRINGS (guessnr,":>/:")
LOOP n=nr,y=checknr
IF (length!=4) THEN
PRINT "4-letter digit required"
EXIT
ELSEIF (n==y) THEN
SET bulls=bulls+1
ELSEIF (nr.ct.":{y}:") THEN
SET cows=cows+1
ENDIF
ENDLOOP
PRINT "bulls=",bulls," cows=",cows
IF (bulls==4) THEN
PRINT "BINGO"
EXIT
ELSEIF (r==limit) THEN
PRINT "BETTER NEXT TIME"
EXIT
ENDIF
ENDLOOP



Output:


round 1 insert a number >1234
bulls=1 cows=1
round 2 insert a number >5678
bulls=1 cows=1
round 3 insert a number >1298
bulls=2 cows=0
round 4 insert a number >2379
bulls=0 cows=0
round 5 insert a number >1468
bulls=4 cows=0
BINGO



## uBasic/4tH

Local(2) ' Let's use no globals

Proc _Initialize ' Get our secret number

Do ' Repeat until it's guessed Do Input "Enter your guess: ";a@ ' Enter your guess While FUNC(_Invalid(a@)) ' but make sure it's a valid guess Loop

a@ = FUNC(_Bulls) ' Count the number of bulls b@ = FUNC(_Cows) ' Count the number of cows ' Now give some feedback Print : Print "\tThere were ";a@;" bulls and ";b@;" cows." : Print Until a@ = 4 ' Until the secret is guessed Loop

Print "You win!" ' Yes, you guessed it

End

_Initialize ' Make a secret Local (1)

Do a@ = 1234 + RND(8643) ' Get a valid number While FUNC(_Invalid(a@)) ' and accept it unless invalid Loop

For a@ = 0 to 3 ' Now save it at the proper place @(a@+4) = @(a@) Next Return

_Invalid Param(1) ' Check whether a number is valid Local(2) ' Ok, these can't be right at all If (a@ < 1234) + (a@ > 9876) Then Return (1) ' Now break 'em up in different digits For b@ = 3 To 0 Step -1 @(b@) = a@ % 10 ' A digit of zero can't be right If @(b@) = 0 Then Unloop : Return (1) a@ = a@ / 10 Next

For b@ = 0 To 2 ' Now compare all digits For c@ = b@ + 1 To 3 ' The others were already compared If @(b@) = @(c@) Then Unloop : Unloop : Return (1) Next ' Wrong, we found similar digits Next Return (0) ' All digits are different

_Bulls ' Count the number of valid guesses Local (2)

For a@ = 0 to 3 ' Increment with each valid guess If @(a@) = @(a@+4) Then b@ = b@ + 1 Next Return (b@) ' Return number of valid guesses

_Cows Local (3) ' Count the number of proper digits

For a@ = 0 To 3 ' All the players guesses For b@ = 4 To 7 ' All the computers secrets If (a@+4) = b@ Then Continue ' Skip the bulls If @(a@) = @(b@) Then c@ = c@ + 1 Next ' Increment with valid digits Next Return (c@) ' Return number of valid digits



## UNIX Shell

{{works with|bash|3}}

bash
#!/bin/bash

rand() {
local min=${1:-0} local max=${2:-32767}

[ ${min} -gt${max} ] &&
min=$(( min ^ max )) && max=$(( min ^ max )) &&
min=$(( min ^ max )) echo -n$(( ( $RANDOM %$max ) + $min )) } in_arr() { local quandry="${1}"
shift
local arr=( $@ ) local i='' for i in${arr[*]}
do
[ "${quandry}" == "${i}" ] && return 0 && break
done

return 1
}

delete_at() {
local idx="$(($1 + 1 ))"
shift
local arr=( "sentinel" $@ ) echo -n "${arr[@]:1:$(( idx - 1 ))}${arr[@]:$((idx + 1)):$(( ${#arr[@]} - idx - 1))}" } delete_first() { local meanie="${1}"
shift
local arr=( $@ ) local i=0 for (( i = 0; i <${#arr[@]} ; i++ ))
do
[ "${arr[${i}]}" == "${meanie}" ] && arr=($( delete_at ${i}${arr[*]} ) )
done

echo -n "${arr[*]}" } to_arr() { local string="${1}"
local arr=()

while [ "${#string}" -gt 0 ] do arr=(${arr[*]} ${string:0:1} ) string="${string:1}"
done

echo -n "${arr[*]}" } choose_idx() { local arr=($@ )

echo -n "$( rand 0$(( ${#arr[@]} - 1 )) )" } locate_bulls() { local secret=($( to_arr "${1}" ) ) local guess=($( to_arr "${2}" ) ) local hits=() local i=0 for (( i=0; i<4; i++ )) do [ "${secret[${i}]}" -eq "${guess[${i}]}" ] && hits=(${hits[*]} ${i} ) done echo -n "${hits[*]}"
}

bulls() {
local secret="${1}" local guess="${2}"
local bulls=( $( locate_bulls "${secret}" "${guess}" ) ) echo -n "${#bulls[@]}"
}

cows() {
local secret=( $( to_arr "${1}" ) )
local guess=( $( to_arr "${2}" ) )
local bulls=( $( locate_bulls "${1}" "${2}" ) ) local hits=0 local i='' # Avoid double-counting bulls for i in${bulls[*]}
do
secret=( $( delete_at${i} ${secret[*]} ) ) done # Process the guess against what's left of the secret for i in${guess[*]}
do
in_arr "${i}"${secret[*]} &&
secret=( $( delete_first "${i}" ${secret[*]} ) ) && (( hits++ )) done echo -n${hits}
}

malformed() {
local guess=( $( to_arr "${1}" ) )
local i=''

[ ${#guess[@]} -ne 4 ] && return 0 for i in${guess[*]}
do
if ! in_arr ${i} 1 2 3 4 5 6 7 8 9 then return 0 break fi done return 1 } candidates=( 1 2 3 4 5 6 7 8 9 ) secret='' while [ "${#secret}" -lt 4 ]
do
cidx=$( choose_idx${candidates[*]} )
secret="${secret}${candidates[${cidx}]}" candidates=($(delete_at ${cidx}${candidates[*]} ) )
done

while read -p "Enter a four-digit guess:  " guess
do
malformed "${guess}" && echo "Malformed guess" && continue [ "${guess}" == "${secret}" ] && echo "You win!" && exit echo "Score:$( bulls "${secret}" "${guess}" ) Bulls, $( cows "${secret}" "${guess}" ) Cows" done  ## VBA  Option Explicit Sub Main_Bulls_and_cows() Dim strNumber As String, strInput As String, strMsg As String, strTemp As String Dim boolEnd As Boolean Dim lngCpt As Long Dim i As Byte, bytCow As Byte, bytBull As Byte Const NUMBER_OF_DIGITS As Byte = 4 Const MAX_LOOPS As Byte = 25 'the max of lines supported by MsgBox strNumber = Create_Number(NUMBER_OF_DIGITS) Do bytBull = 0: bytCow = 0: lngCpt = lngCpt + 1 If lngCpt > MAX_LOOPS Then strMsg = "Max of loops... Sorry you loose!": Exit Do strInput = AskToUser(NUMBER_OF_DIGITS) If strInput = "Exit Game" Then strMsg = "User abort": Exit Do For i = 1 To Len(strNumber) If Mid(strNumber, i, 1) = Mid(strInput, i, 1) Then bytBull = bytBull + 1 ElseIf InStr(strNumber, Mid(strInput, i, 1)) > 0 Then bytCow = bytCow + 1 End If Next i If bytBull = Len(strNumber) Then boolEnd = True: strMsg = "You win in " & lngCpt & " loops!" Else strTemp = strTemp & vbCrLf & "With : " & strInput & " ,you have : " & bytBull & " bulls," & bytCow & " cows." MsgBox strTemp End If Loop While Not boolEnd MsgBox strMsg End Sub Function Create_Number(NbDigits As Byte) As String Dim myColl As New Collection Dim strTemp As String Dim bytAlea As Byte Randomize Do bytAlea = Int((Rnd * 9) + 1) On Error Resume Next myColl.Add CStr(bytAlea), CStr(bytAlea) If Err <> 0 Then On Error GoTo 0 Else strTemp = strTemp & CStr(bytAlea) End If Loop While Len(strTemp) < NbDigits Create_Number = strTemp End Function Function AskToUser(NbDigits As Byte) As String Dim boolGood As Boolean, strIn As String, i As Byte, NbDiff As Byte Do While Not boolGood strIn = InputBox("Enter your number (" & NbDigits & " digits)", "Number") If StrPtr(strIn) = 0 Then strIn = "Exit Game": Exit Do If strIn <> "" Then If Len(strIn) = NbDigits Then NbDiff = 0 For i = 1 To Len(strIn) If Len(Replace(strIn, Mid(strIn, i, 1), "")) < NbDigits - 1 Then NbDiff = 1 Exit For End If Next i If NbDiff = 0 Then boolGood = True End If End If Loop AskToUser = strIn End Function  ## Vedit macro language Buf_Switch(Buf_Free) #90 = Time_Tick // seed for random number generator #91 = 10 // random numbers in range 0 to 9 while (EOB_pos < 4) { // 4 digits needed Call("RANDOM") BOF Ins_Char(Return_Value + '0') Replace("(.)(.*)\1", "\1\2", REGEXP+BEGIN+NOERR) // remove any duplicate } #3 = 0 repeat (99) { Get_Input(10, "Guess a 4-digit number with no duplicate digits: ", NOCR) if (Reg_Size(10) == 0) { Break } // empty string = exit Num_Eval_Reg(10) // check for numeric digits if (Chars_Matched != 4) { M("You should enter 4 numeric digits\n") Continue } Goto_Pos(4) // count bulls Reg_Ins(10, OVERWRITE) #1 = Search("(.)...\1", REGEXP+BEGIN+ALL+NOERR) RS(10, "[", INSERT) // count cows RS(10, "]", APPEND) #2 = Search_Block(@10, 0, 4, REGEXP+BEGIN+ALL+NOERR) - #1 #3++ NT(#1, NOCR) M(" bulls,") NT(#2, NOCR) M(" cows\n") if (#1 == 4) { M("You won after") NT(#3, NOCR) M(" guesses!\n") Break } } Buf_Quit(OK) Return //-------------------------------------------------------------- // Generate random numbers in range 0 <= Return_Value < #91 // #90 = Seed (0 to 0x7fffffff) // #91 = Scaling (0 to 0x10000) :RANDOM: #92 = 0x7fffffff / 48271 #93 = 0x7fffffff % 48271 #90 = (48271 * (#90 % #92) - #93 * (#90 / #92)) & 0x7fffffff Return ((#90 & 0xffff) * #91 / 0x10000)  ## Visual Basic .NET Imports System Imports System.Text.RegularExpressions Module Bulls_and_Cows Function CreateNumber() As String Dim random As New Random() Dim sequence As Char() = {"1"c, "2"c, "3"c, "4"c, "5"c, "6"c, "7"c, "8"c, "9"c} For i As Integer = 0 To sequence.Length - 1 Dim j As Integer = random.Next(sequence.Length) Dim temp As Char = sequence(i) : sequence(i) = sequence(j) : sequence(j) = temp Next Return New String(sequence, 0, 4) End Function Function IsFourDigitNumber(ByVal number As String) As Boolean Return Regex.IsMatch(number, "^[1-9]{4}$")
End Function

Sub Main()
Dim chosenNumber As String = CreateNumber()
Dim attempt As Integer = 0
Console.WriteLine("Number is chosen")
Dim gameOver As Boolean = False
Do
attempt += 1
Console.WriteLine("Attempt #{0}. Enter four digit number: ", attempt)
Dim number As String = Console.ReadLine()
Do While Not IsFourDigitNumber(number)
Console.WriteLine("Invalid number: type four characters. Every character must digit be between '1' and '9'.")
Loop

Dim bulls As Integer = 0
Dim cows As Integer = 0

For i As Integer = 0 To number.Length - 1
Dim j As Integer = chosenNumber.IndexOf(number(i))
If i = j Then
bulls += 1
ElseIf j >= 0 Then
cows += 1
End If
Next

If bulls < chosenNumber.Length Then
Console.WriteLine("The number '{0}' has {1} bulls and {2} cows", _
number, bulls, cows)
Else
gameOver = True
End If
Loop Until gameOver
Console.WriteLine("The number was guessed in {0} attempts. Congratulations!", attempt)
End Sub
End Module


## zkl

Play one game:

d:=Dictionary(); do{ d[(1).random(10)]=True }while(d.len()<4);
abcd:=d.keys.shuffle();
while(1){
if(guess.len()!=4 or guess.unique().len()!=4) continue;
bulls:=abcd.zipWith('==,guess).sum(0);
cows:=guess.split("").enumerate()
.reduce('wrap(s,[(n,c)]){ s + (d.find(c,False) and abcd[n]!=c) },0);
if(bulls==4) { println("You got it!"); break; }
"%d bull%s and %d cow%s".fmt(bulls,s(bulls),cows,s(cows)).println();
}
fcn s(n){ (n!=1) and "s" or "" }


{{out}}


4 digits: 4,5,6,7
1 bull and 0 cows
4 digits: 1234
0 bulls and 2 cows
4 digits: 3528
You got it!



## ZX Spectrum Basic

{{trans|QBasic}}

10 DIM n(10): LET c$="" 20 FOR i=1 TO 4 30 LET d=INT (RND*9+1) 40 IF n(d)=1 THEN GO TO 30 50 LET n(d)=1 60 LET c$=c$+STR$ d
70 NEXT i
80 LET guesses=0
90 INPUT "Guess a 4-digit number (1 to 9) with no duplicate digits: ";guess
100 IF guess=0 THEN STOP
110 IF guess>9999 OR guess<1000 THEN PRINT "Only 4 numeric digits, please": GO TO 90
120 LET bulls=0: LET cows=0: LET guesses=guesses+1: LET g$=STR$ guess
130 FOR i=1 TO 4
140 IF g$(i)=c$(i) THEN LET bulls=bulls+1: GO TO 160
150 IF n(VAL g$(i))=1 THEN LET cows=cows+1 160 NEXT i 170 PRINT bulls;" bulls, ";cows;" cows" 180 IF c$=g\$ THEN PRINT "You won after ";guesses;" guesses!": GO TO 10
190 GO TO 90