⚠️ 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.

;Task: Produce a sequential count in octal, starting at zero, and using an increment of a one for each consecutive number.

Each number should appear on a single line, and the program should count until terminated, or until the maximum value of the numeric type in use is reached.

• [[Integer sequence]] is a similar task without the use of octal numbers.

## 0815

```}:l:>     Start loop, enqueue Z (initially 0).
}:o:    Treat the queue as a stack and
<:8:= accumulate the octal digits
/=>&~ of the current number.
^:o:

<:0:-   Get a sentinel negative 1.
&>@     Enqueue it between the digits and the current number.
{       Dequeue the first octal digit.

}:p:
~%={+ Rotate each octal digit into place and print it.
^:p:

<:a:~\$  Output a newline.
<:1:x{+ Dequeue the current number and increment it.
^:l:
```

## 360 Assembly

The program uses one ASSIST macro (XPRNT) to keep the code as short as possible.

```*        Octal                     04/07/2016
OCTAL    CSECT
USING  OCTAL,R13          base register
B      72(R15)            skip savearea
DC     17F'0'             savearea
STM    R14,R12,12(R13)    prolog
ST     R13,4(R15)         "
ST     R15,8(R13)         "
LR     R13,R15            "
LA     R6,0               i=0
LOOPI    LR     R2,R6              x=i
LA     R9,10              j=10
LA     R4,PG+23           @pg
LOOP     LR     R3,R2              save x
SLL    R2,29              shift left  32-3
SRL    R2,29              shift right 32-3
CVD    R2,DW              convert octal(j) to pack decimal
OI     DW+7,X'0F'         prepare unpack
UNPK   0(1,R4),DW         packed decimal to zoned printable
LR     R2,R3              restore x
SRL    R2,3               shift right 3
BCTR   R4,0               @pg=@pg-1
BCT    R9,LOOP            j=j-1
CVD    R2,DW              binary to pack decimal
OI     DW+7,X'0F'         prepare unpack
UNPK   0(1,R4),DW         packed decimal to zoned printable
CVD    R6,DW              convert i to pack decimal
ED     ZN12,DW+2          packed decimal (PL6) to char (CL12)
MVC    PG(12),ZN12        output i
XPRNT  PG,80              print buffer
C      R6,=F'2147483647'  if i>2**31-1 (integer max)
BE     ELOOPI             then exit loop on i
LA     R6,1(R6)           i=i+1
B      LOOPI              loop on i
ELOOPI   L      R13,4(0,R13)       epilog
LM     R14,R12,12(R13)    "
XR     R15,R15            "
BR     R14                exit
LTORG
PG       DC     CL80' '            buffer
DW       DS     0D,PL8             15num
ZN12     DS     CL12
EM12     DC     X'40',9X'20',X'2120'  mask CL12 11num
YREGS
END    OCTAL
```

{{out}}

```           0 00000000000
1 00000000001
2 00000000002
3 00000000003
4 00000000004
5 00000000005
6 00000000006
7 00000000007
8 00000000010
9 00000000011
10 00000000012
10 00000000012
11 00000000013
...
2147483640 17777777770
2147483641 17777777771
2147483642 17777777772
2147483643 17777777773
2147483644 17777777774
2147483645 17777777775
2147483646 17777777776
2147483647 17777777777

```

procedure Octal is
begin
for I in 0 .. Integer'Last loop
IIO.Put(I, Base => 8);
end loop;
end Octal;
```

First few lines of Output:

```txt
8#0#
8#1#
8#2#
8#3#
8#4#
8#5#
8#6#
8#7#
8#10#
8#11#
8#12#
8#13#
8#14#
8#15#
8#16#
8#17#
8#20#
```

## Aime

```aime
integer o;

o = 0;
do {
o_xinteger(8, o);
o_byte('\n');
o += 1;
} while (0 < o);
```

## ALGOL 68

{{wont work 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] - due to extensive use of '''format'''[ted] ''transput''.}}

```algol68
#!/usr/local/bin/a68g --script #

INT oct width = (bits width-1) OVER 3 + 1;
main:
(
FOR i TO 17 # max int # DO
printf((\$"8r"8r n(oct width)dl\$, BIN i))
OD
)
```

Output:

```txt

8r00000000001
8r00000000002
8r00000000003
8r00000000004
8r00000000005
8r00000000006
8r00000000007
8r00000000010
8r00000000011
8r00000000012
8r00000000013
8r00000000014
8r00000000015
8r00000000016
8r00000000017
8r00000000020
8r00000000021

```

## ALGOL W

Algol W has built-in hexadecimal and decimal output, this implements octal output.

```algolw
begin
string(12) r;
string(8)  octDigits;
integer    number;
octDigits := "01234567";
number    := -1;
while number < MAXINTEGER do begin
integer    v, cPos;
number := number + 1;
v      := number;
% build a string of octal digits in r, representing number %
% Algol W uses 32 bit integers, so r should be big enough  %
% the most significant digit is on the right               %
cPos   := 0;
while begin
r( cPos // 1 ) := octDigits( v rem 8 // 1 );
v :=  v div 8;
( v > 0 )
end do begin
cPos := cPos + 1
end while_v_gt_0;
% show most significant digit on a newline %
write( r( cPos // 1 ) );
% continue the line with the remaining digits (if any) %
for c := cPos - 1 step -1 until 0 do writeon( r( c // 1 ) )
end while_r_lt_MAXINTEGER
end.
```

{{out}}

```txt

0
1
2
3
4
5
6
7
10
11
12
...

```

## ARM Assembly

{{works with|as|Raspberry Pi}}

```ARM Assembly

/* ARM assembly Raspberry PI  */
/*  program countoctal.s   */

/************************************/
/* Constantes                       */
/************************************/
.equ STDOUT, 1     @ Linux output console
.equ EXIT,   1     @ Linux syscall
.equ WRITE,  4     @ Linux syscall

/*********************************/
/* Initialized data              */
/*********************************/
.data
sMessResult:        .ascii "Count : "
sMessValeur:        .fill 11, 1, ' '            @ size => 11
szCarriageReturn:   .asciz "\n"

/*********************************/
/* UnInitialized data            */
/*********************************/
.bss
/*********************************/
/*  code section                 */
/*********************************/
.text
.global main
main:                                             @ entry of program
mov r4,#0                                     @ loop indice
1:                                                @ begin loop
mov r0,r4
bl conversion8                                @ call conversion octal
bl affichageMess                              @ display message
cmp r4,#64
ble 1b

100:                                              @ standard end of the program
mov r0, #0                                    @ return code
mov r7, #EXIT                                 @ request to exit program
svc #0                                        @ perform the system call

/******************************************************************/
/*     display text with size calculation                         */
/******************************************************************/
/* r0 contains the address of the message */
affichageMess:
push {r0,r1,r2,r7,lr}                          @ save  registres
mov r2,#0                                      @ counter length
1:                                                 @ loop length calculation
ldrb r1,[r0,r2]                                @ read octet start position + index
cmp r1,#0                                      @ if 0 its over
bne 1b                                         @ and loop
@ so here r2 contains the length of the message
mov r1,r0                                      @ address message in r1
mov r0,#STDOUT                                 @ code to write to the standard output Linux
mov r7, #WRITE                                 @ code call system "write"
svc #0                                         @ call systeme
pop {r0,r1,r2,r7,lr}                           @ restaur des  2 registres */
bx lr                                          @ return
/******************************************************************/
/*     Converting a register to octal                             */
/******************************************************************/
/* r0 contains value and r1 address area   */
/* r0 return size of result (no zero final in area) */
/* area size => 11 bytes          */
.equ LGZONECAL,   10
conversion8:
push {r1-r4,lr}                                 @ save registers
mov r3,r1
mov r2,#LGZONECAL

1:                                                  @ start loop
mov r1,r0
lsr r0,#3                                       @ / by 8
sub r1,r0,lsl #3                                @ compute remainder r1 - (r0 * 8)
strb r1,[r3,r2]                                 @ store digit on area
cmp r0,#0                                       @ stop if quotient = 0
subne r2,#1                                     @ else previous position
bne 1b                                          @ and loop
@ and move digit from left of area
mov r4,#0
2:
ldrb r1,[r3,r2]
strb r1,[r3,r4]
cmp r2,#LGZONECAL
ble 2b
@ and move spaces in end on area
mov r0,r4                                         @ result length
mov r1,#' '                                       @ space
3:
strb r1,[r3,r4]                                   @ store space in area
cmp r4,#LGZONECAL
ble 3b                                            @ loop if r4 <= area size

100:
pop {r1-r4,lr}                                    @ restaur registres
bx lr                                             @return

```

## AutoHotkey

```AHK
DllCall("AllocConsole")
Octal(int){
While int
out := Mod(int, 8) . out, int := int//8
return out
}
Loop
{
FileAppend, % Octal(A_Index) "`n", CONOUT\$
Sleep 200
}
```

## AWK

The awk extraction and reporting language uses the underlying C library to provide support for the printf command. This enables us to use that function to output the counter value as octal:

```awk
BEGIN {
for (l = 0; l <= 2147483647; l++) {
printf("%o\n", l);
}
}
```

## BASIC

Some BASICs provide a built-in function to convert a number to octal, typically called `OCT\$`.

{{works with|QBasic}}

```qbasic
DIM n AS LONG
FOR n = 0 TO &h7FFFFFFF
PRINT OCT\$(n)
NEXT
```

However, many do not. For those BASICs, we need to write our own function.

{{works with|Chipmunk Basic}}

```qbasic
WHILE ("" = INKEY\$)
PRINT Octal\$(n)
n = n + 1
WEND
END
FUNCTION Octal\$(what)
outp\$ = ""
w = what
WHILE ABS(w) > 0
o = w AND 7
w = INT(w / 8)
outp\$ = STR\$(o) + outp\$
WEND
Octal\$ = outp\$
END FUNCTION
```

See also: [[#BBC BASIC|BBC BASIC]], [[#Liberty BASIC|Liberty BASIC]], [[#PureBasic|PureBasic]], [[#Run BASIC|Run BASIC]]

=
## Applesoft BASIC
=

```ApplesoftBasic
10 N\$ = "0"

100 O\$ = N\$
110 PRINT O\$
120 N\$ = ""
130 C = 1
140 FOR I = LEN(O\$) TO 1 STEP -1
150     N = VAL(MID\$(O\$, I, 1)) + C
160     C = N >= 8
170     N\$ = STR\$(N - C * 8) + N\$
180 NEXT I
190 IF C THEN N\$ = "1" + N\$
200 GOTO 100
```

=
## Sinclair ZX81 BASIC
=
The octal number is stored and manipulated as a string, meaning that even with only 1k of RAM the program shouldn't stop until the number gets to a couple of hundred digits long. I have not left it running long enough to find out exactly when it does run out of memory. The `SCROLL` statement is necessary: the ZX81 halts when the screen is full unless it is positively told to scroll instead.

```basic
10 LET N\$="0"
20 SCROLL
30 PRINT N\$
40 LET L=LEN N\$
50 LET N=VAL N\$(L)+1
60 IF N=8 THEN GOTO 90
70 LET N\$(L)=STR\$ N
80 GOTO 20
90 LET N\$(L)="0"
100 IF L=1 THEN GOTO 130
110 LET L=L-1
120 GOTO 50
130 LET N\$="1"+N\$
140 GOTO 20
```

## Batch File

```dos

@echo off
:: {CTRL + C} to exit the batch file

:: Send incrementing decimal values to the :to_Oct function
set loop=0
:loop1
call:to_Oct %loop%
set /a loop+=1
goto loop1

:: Convert the decimal values parsed [%1] to octal and output them on a new line
:to_Oct
set todivide=%1
set "fulloct="

:loop2
set tomod=%todivide%
set /a appendmod=%tomod% %% 8
set fulloct=%appendmod%%fulloct%
if %todivide% lss 8 (
echo %fulloct%
exit /b
)
set /a todivide/=8
goto loop2

```

{{out}}

```txt

0
1
2
3
4
5
6
7
10
...

```

## BBC BASIC

Terminate by pressing ESCape.

```bbcbasic
N% = 0
REPEAT
PRINT FN_tobase(N%, 8, 0)
N% += 1
UNTIL FALSE
END

REM Convert N% to string in base B% with minimum M% digits:
DEF FN_tobase(N%, B%, M%)
LOCAL D%, A\$
REPEAT
D% = N% MOD B%
N% DIV= B%
IF D%<0 D% += B% : N% -= 1
A\$ = CHR\$(48 + D% - 7*(D%>9)) + A\$
M% -= 1
UNTIL (N%=FALSE OR N%=TRUE) AND M%<=0
=A\$

```

## bc

```bc
obase = 8			/* Output base is octal. */
for (num = 0; 1; num++) num	/* Loop forever, printing counter. */
```

The loop never stops at a maximum value, because bc uses [[arbitrary-precision integers (included)|arbitrary-precision integers]].

## Befunge

This is almost identical to the [[Binary digits#Befunge|Binary digits]] sample, except for the change of base and the source coming from a loop rather than a single input.

```befunge
:0\55+\:8%68>*#<+#8\#68#%/#8:_\$>:#,_\$1+:0`!#@_
```

## Bracmat

Stops when the user presses Ctrl-C or when the stack overflows. The solution is not elegant, and so is octal counting.

```bracmat

( oct
=
.     !arg:<8
& (!arg:~<0|ERROR)
| str\$(oct\$(div\$(!arg.8)) mod\$(!arg.8))
)
& -1:?n
& whl'(1+!n:?n&out\$(!n oct\$!n));

```

```bf
[>>++++++++<< Set up {n 0 8} for divmod magic
[->+>-        Then
[>+>>]>       do
[+[-<+>]>+>>] the
<<<<<<]       magic
>>>+          Increment n % 8 so that 0s don't break things
>]            Move into n / 8 and divmod that unless it's 0
-<            Set up sentinel ‑1 then move into the first octal digit
[++++++++ ++++++++ ++++++++ Add 47 to get it to ASCII
++++++++ ++++++++ +++++++. and print it
[<]<]         Get to a 0; the cell to the left is the next octal digit
>>[<+>-]      Tape is {0 n}; make it {n 0}
>[>+]         Get to the ‑1
<[[-]<]       Zero the tape for the next iteration
++++++++++.   Print a newline
[-]<+]        Zero it then increment n and go again
```

## C

```c
#include

int main()
{
unsigned int i = 0;
do { printf("%o\n", i++); } while(i);
return 0;
}
```

## C#

```c#
using System;

class Program
{
static void Main()
{
var number = 0;
do
{
Console.WriteLine(Convert.ToString(number, 8));
} while (++number > 0);
}
}
```

## C++

This prevents an infinite loop by counting until the counter overflows and produces a 0 again. This could also be done with a for or while loop, but you'd have to print 0 (or the last number) outside the loop.

```cpp
#include

int main()
{
unsigned i = 0;
do
{
std::cout << std::oct << i << std::endl;
++i;
} while(i != 0);
return 0;
}
```

## Clojure

```clojure
(doseq [i (range)] (println (format "%o" i)))
```

## COBOL

{{trans|Delphi}}
{{works with|GNU Cobol|2.0}}

```cobol>       >
SOURCE FREE
IDENTIFICATION DIVISION.
PROGRAM-ID. count-in-octal.

ENVIRONMENT DIVISION.
CONFIGURATION SECTION.
REPOSITORY.
FUNCTION dec-to-oct
.
DATA DIVISION.
WORKING-STORAGE SECTION.
01  i                                   PIC 9(18).

PROCEDURE DIVISION.
PERFORM VARYING i FROM 1 BY 1 UNTIL i = 0
DISPLAY FUNCTION dec-to-oct(i)
END-PERFORM
.
END PROGRAM count-in-octal.

IDENTIFICATION DIVISION.
FUNCTION-ID. dec-to-oct.

DATA DIVISION.
LOCAL-STORAGE SECTION.
01  rem                                 PIC 9.

01  dec                                 PIC 9(18).

01  dec-arg                             PIC 9(18).

01  oct                                 PIC 9(18).

PROCEDURE DIVISION USING dec-arg RETURNING oct.
MOVE dec-arg TO dec *> Copy is made to avoid modifying reference arg.
PERFORM WITH TEST AFTER UNTIL dec = 0
MOVE FUNCTION REM(dec, 8) TO rem
STRING rem, oct DELIMITED BY SPACES INTO oct
DIVIDE 8 INTO dec
END-PERFORM
.
END FUNCTION dec-to-oct.
```

## CoffeeScript

```coffeescript

n = 0

while true
console.log n.toString(8)
n += 1

```

## Common Lisp

```lisp
(loop for i from 0 do (format t "~o~%" i))
```

## Component Pascal

BlackBox Component Builder

```oberon2

MODULE CountOctal;
IMPORT StdLog,Strings;

PROCEDURE Do*;
VAR
i: INTEGER;
resp: ARRAY 32 OF CHAR;
BEGIN
FOR i := 0 TO 1000 DO
Strings.IntToStringForm(i,8,12,' ',TRUE,resp);
StdLog.String(resp);StdLog.Ln
END
END Do;
END CountOctal.

```

Execute: ^Q CountOctal.Do
Output:

```txt

0%8
1%8
2%8
3%8
4%8
5%8
6%8
7%8
10%8
11%8
12%8
13%8
14%8
15%8
16%8
17%8
20%8
21%8
22%8

```

## Crystal

```ruby
# version 0.21.1
# using unsigned 8 bit integer, range 0 to 255

(0_u8..255_u8).each { |i| puts i.to_s(8) }
```

{{out}}

```txt

0
1
2
3
4
5
6
7
10
11
12
...
374
375
376
377

```

## D

```d
void main() {
import std.stdio;

ubyte i;
do writefln("%o", i++);
while(i);
}
```

## Dc

###  Named Macro

A simple infinite loop and octal output will do.

```Dc
8o0[p1+lpx]dspx
```

###  Anonymous Macro

Needs `r` (swap TOS and NOS):

```Dc
8 o 0 [ r p 1 + r dx ] dx
```

Pushing/poping TOS to a named stack can be used instead of swaping:

```Dc
8 o 0 [ S@ p 1 + L@ dx ] dx
```

## DCL

```DCL
\$ i = 0
\$ loop:
\$  write sys\$output f\$fao( "!OL", i )
\$  i = i + 1
\$  goto loop
```

{{out}}

```txt
00000000000
00000000001
00000000002
...
17777777777
20000000000
20000000001
...
37777777777
00000000000
00000000001
...
```

## Delphi

```Delphi
program CountingInOctal;

{\$APPTYPE CONSOLE}

uses SysUtils;

function DecToOct(aValue: Integer): string;
var
lRemainder: Integer;
begin
Result := '';
repeat
lRemainder := aValue mod 8;
Result := IntToStr(lRemainder) + Result;
aValue := aValue div 8;
until aValue = 0;
end;

var
i: Integer;
begin
for i := 0 to 20 do
WriteLn(DecToOct(i));
end.
```

## Elixir

```elixir
Stream.iterate(0,&(&1+1)) |> Enum.each(&IO.puts Integer.to_string(&1,8))
```

or

```elixir
Stream.unfold(0, fn n ->
IO.puts Integer.to_string(n,8)
{n,n+1}
end) |> Stream.run
```

or

```elixir
f = fn ff,i -> :io.fwrite "~.8b~n", [i]; ff.(ff, i+1) end
f.(f, 0)
```

## Emacs Lisp

Displays in the message area interactively, or to standard output under `-batch`.

```lisp
(dotimes (i most-positive-fixnum) ;; starting from 0
(message "%o" i))
```

## Erlang

The fun is copied from [[Integer sequence#Erlang]]. I changed the display format.

```Erlang

F = fun(FF, I) -> io:fwrite("~.8B~n", [I]), FF(FF, I + 1) end.

```

Use like this:

```txt

F( F, 0 ).

```

## Euphoria

```euphoria
integer i
i = 0
while 1 do
printf(1,"%o\n",i)
i += 1
end while
```

Output:

```txt
...
6326
6327
6330
6331
6332
6333
6334
6335
6336
6337

```

```fsharp
let rec countInOctal num : unit =
printfn "%o" num
countInOctal (num + 1)

countInOctal 1
```

## Factor

```factor
USING: kernel math prettyprint ;
0 [ dup .o 1 + t ] loop
```

## Forth

Using INTS from [[Integer sequence#Forth]]

```forth
: octal ( -- )  8 base ! ;  \ where unavailable

octal ints
```

## Fortran

{{works with|Fortran|95 and later}}

```fortran
program Octal
implicit none

integer, parameter :: i64 = selected_int_kind(18)
integer(i64) :: n = 0

! Will stop when n overflows from
! 9223372036854775807 to -92233720368547758078 (1000000000000000000000 octal)
do while(n >= 0)
write(*, "(o0)") n
n = n + 1
end do
end program
```

## FreeBASIC

```freebasic
' FB 1.05.0 Win64

Dim ub As UByte = 0 ' only has a range of 0 to 255
Do
Print Oct(ub, 3)
ub += 1
Loop Until ub = 0 ' wraps around to 0 when reaches 256
Print
Print "Press any key to quit"
Sleep
```

## Futhark

Futhark cannot print.  Instead we produce an array of integers that
look like octal numbers when printed in decimal.

```Futhark

fun octal(x: int): int =
loop ((out,mult,x) = (0,1,x)) = while x > 0 do
let digit = x % 8
let out = out + digit * mult
in (out, mult * 10, x / 8)
in out

fun main(n: int): [n]int =
map octal (iota n)

```

## FutureBasic

```futurebasic

include "ConsoleWindow
defstr word

dim as short i

for i = &o000000 to &o000031      // 0 to 25 in decimal
print oct\$(i); " in octal ="; i
next

```

Output:

```txt

000000 in octal = 0
000001 in octal = 1
000002 in octal = 2
000003 in octal = 3
000004 in octal = 4
000005 in octal = 5
000006 in octal = 6
000007 in octal = 7
000010 in octal = 8
000011 in octal = 9
000012 in octal = 10
000013 in octal = 11
000014 in octal = 12
000015 in octal = 13
000016 in octal = 14
000017 in octal = 15
000020 in octal = 16
000021 in octal = 17
000022 in octal = 18
000023 in octal = 19
000024 in octal = 20
000025 in octal = 21
000026 in octal = 22
000027 in octal = 23
000030 in octal = 24
000031 in octal = 25

```

## Go

```go
package main

import (
"fmt"
"math"
)

func main() {
for i := int8(0); ; i++ {
fmt.Printf("%o\n", i)
if i == math.MaxInt8 {
break
}
}
}
```

Output:

```txt

0
1
2
3
4
5
6
7
10
11
12
...
175
176
177

```

Note that to use a different integer type, code must be changed in two places.  Go has no way to query a type for its maximum value.  Example:

```go
func main() {
for i := uint16(0); ; i++ {  // type specified here
fmt.Printf("%o\n", i)
if i == math.MaxUint16 { // maximum value for type specified here
break
}
}
}
```

Output:

```txt

...
177775
177776
177777

```

Note also that if floating point types are used for the counter, loss of precision will prevent the program from from ever reaching the maximum value.  If you stretch interpretation of the task wording "maximum value" to mean "maximum value of contiguous integers" then the following will work:

```go
import "fmt"

func main() {
for i := 0.; ; {
fmt.Printf("%o\n", int64(i))
/* uncomment to produce example output
if i == 3 {
fmt.Println("...")
} */
next := i + 1
if next == i {
break
}
i = next
}
}
```

Output, with skip uncommented:

```txt

0
1
2
3
...
377777777777777775
377777777777777776
377777777777777777
400000000000000000

```

Big integers have no maximum value, but the Go runtime will panic when memory allocation fails.  The deferred recover here allows the program to terminate silently should the program run until this happens.

```go
import (
"big"
"fmt"
)

func main() {
defer func() {
recover()
}()
one := big.NewInt(1)
for i := big.NewInt(0); ; i.Add(i, one) {
fmt.Printf("%o\n", i)
}
}
```

Output:

```txt

0
1
2
3
4
5
6
7
10
11
12
13
14
...

```

## Groovy

Size-limited solution:

```groovy
println 'decimal  octal'
for (def i = 0; i <= Integer.MAX_VALUE; i++) {
printf ('%7d  %#5o\n', i, i)
}
```

Unbounded solution:

```groovy
println 'decimal  octal'
for (def i = 0g; true; i += 1g) {
printf ('%7d  %#5o\n', i, i)
}
```

Output:

```txt
decimal  octal
0     00
1     01
2     02
3     03
4     04
5     05
6     06
7     07
8    010
9    011
10    012
11    013
12    014
13    015
14    016
15    017
16    020
17    021
...
```

import Numeric

main = mapM_ (putStrLn . flip showOct "") [1..]
```

```unicon
link convert   # To get exbase10 method

procedure main()
limit := 8r37777777777
every write(exbase10(seq(0)\limit, 8))
end
```

## J

'''Solution:'''

```J
disp=.([smoutput) ' '(-.~":)8&#.inv
(1+disp)^:_]0x
```

The full result is not displayable, by design.  This could be considered a bug, but is an essential part of this task.  Here's how it starts:

```j
(1+disp)^:_]0x
0
1
2
3
4
5
6
7
10
11
...
```

The important part of this code is 8&#.inv which converts numbers from internal representation to a sequence of base 8 digits. (We then convert this sequence to characters and remove the delimiting spaces - this gives us the octal values we want to display.)

So then we define disp as a word which displays its argument in octal and returns its argument as its result (unchanged).

Finally, the `^:_` clause tells J to repeat this function forever, with `(1+disp)`adding 1 to the result each time it is displayed (or at least tha clause tells J to keep repeating that operation until it gives the same value back twice in a row - which won't happen - or to stop when the machine stops - like if the power is turned off - or if J is shut down - or...).

We use arbitrary precision numbers, not because there's any likelihood that fixed width numbers would ever overflow, but just to emphasize that this thing is going to have to be shut down by some mechanism outside the program.

## Java

```java
public class Count{
public static void main(String[] args){
for(int i = 0;i >= 0;i++){
System.out.println(Integer.toOctalString(i)); //optionally use "Integer.toString(i, 8)"
}
}
}
```

## JavaScript

```javascript
for (var n = 0; n < 1e14; n++) { // arbitrary limit that's not too big
document.writeln(n.toString(8)); // not sure what's the best way to output it in JavaScript
}
```

## Julia

```Julia

for i in one(Int64):typemax(Int64)
print(oct(i), " ")
sleep(0.1)
end

```

I slowed the loop down with a `sleep` to make it possible to see the result without being swamped.

{{out}}

```txt

1 2 3 4 5 6 7 10 11 12 13 14 15 16 17 20 21 22 23 24 25 26 27 30 31 32 33 34 35 36 ^C

```

## Kotlin

```scala
//  version 1.1

//  counts up to 177 octal i.e. 127 decimal
fun main(args: Array) {
(0..Byte.MAX_VALUE).forEach { println("%03o".format(it)) }
}
```

{{out}}
First ten lines:

```txt

000
001
002
003
004
005
006
007
010
011

```

## LabVIEW

LabVIEW contains a Number to Octal String function. The following image shows the front panel and block diagram.
[[file:Count_in_octal.png]]

## Lang5

```lang5
'%4o '__number_format set
0 do dup 1 compress . "\n" . 1 + loop
```

## LFE

```lisp
(: lists foreach
(lambda (x)
(: io format '"~p~n" (list (: erlang integer_to_list x 8))))
(: lists seq 0 2000))

```

## Liberty BASIC

Terminate these ( essentially, practically) infinite loops by hitting

```lb

'the method used here uses the base-conversion from RC Non-decimal radices/Convert
'to terminate hit

global      alphanum\$
alphanum\$   ="01234567"

i =0

while 1
print toBase\$( 8, i)
i =i +1
wend

end

function toBase\$( base, number) '   Convert decimal variable to number string.
maxIntegerBitSize   =len( str\$( number))
toBase\$             =""
for i =10 to 1 step -1
remainder   =number mod base
toBase\$     =mid\$( alphanum\$, remainder +1, 1) +toBase\$
number      =int( number /base)
if number <1 then exit for
next i
toBase\$ =right\$( "             " +toBase\$, 10)
end function

```

As suggested in LOGO, it is easy to work on a string representation too.

```lb

op\$ = "00000000000000000000"
L   =len( op\$)

while 1
started =0

for i =1 to L
m\$ =mid\$( op\$, i, 1)
if started =0 and m\$ ="0" then print " "; else print m\$;: started =1
next i
print

for i =L to 1 step -1
p\$ =mid\$( op\$, i, 1)
if p\$ =" " then v =0 else v =val( p\$)
incDigit  = v +carry
if i =L then incDigit =incDigit +1
if incDigit >=8 then
replDigit =incDigit -8
carry     =1
else
replDigit =incDigit
carry     =0
end if
op\$ =left\$( op\$, i -1) +chr\$( 48 +replDigit) +right\$( op\$, L -i)
next i

wend

end

```

Or use a recursive listing of permutations with the exception that the first digit is not 0 (unless listing single-digit numbers). For each digit-place, list numbers with 0-7 in the next digit-place.

```lb

i = 0
while 1
call CountOctal 0, i, i > 0
i = i + 1
wend

sub CountOctal value, depth, startValue
value = value * 10
for i = startValue to 7
if depth > 0 then
call CountOctal value + i, depth - 1, 0
else
print value + i
end if
next i
end sub

```

## Logo

No built-in octal-formatting, so it's probably more efficient to just manually increment a string than to increment a number and then convert the whole thing to octal every time we print.  This also lets us keep counting as long as we have room for the string.

```logo
to increment_octal :n
ifelse [empty? :n] [
output 1
] [
local "last
make "last last :n
local "butlast
make "butlast butlast :n
make "last sum :last 1
ifelse [:last < 8] [
output word :butlast :last
] [
output word (increment_octal :butlast) 0
]
]
end

make "oct 0
while ["true] [
print :oct
make "oct increment_octal :oct
]
```

## LOLCODE

LOLCODE has no conception of octal numbers, but we can use string concatenation (SMOOSH) and basic arithmetic to accomplish the task.

```LOLCODE
HAI 1.3

HOW IZ I octal YR num
I HAS A digit, I HAS A oct ITZ ""
IM IN YR octalizer
digit R MOD OF num AN 8
oct R SMOOSH digit oct MKAY
num R QUOSHUNT OF num AN 8
NOT num, O RLY?
YA RLY, FOUND YR oct
OIC
IM OUTTA YR octalizer
IF U SAY SO

IM IN YR printer UPPIN YR num
VISIBLE I IZ octal YR num MKAY
IM OUTTA YR printer

KTHXBYE
```

## Lua

```lua
for l=1,2147483647 do
print(string.format("%o",l))
end
```

## M4

```M4
define(`forever',
`ifelse(\$#,0,``\$0'',
`pushdef(`\$1',\$2)\$4`'popdef(`\$1')\$0(`\$1',eval(\$2+\$3),\$3,`\$4')')')dnl
forever(`y',0,1, `eval(y,8)
')
```

## Maple

```Maple

octcount := proc (n)
seq(printf("%a \n", convert(i, octal)), i = 1 .. n);
end proc;

```

## Mathematica

```Mathematica
x=0;
While[True,Print[BaseForm[x,8];x++]
```

```Matlab
n = 0;
while (1)
dec2base(n,8)
n = n+1;
end;
```

Or use printf:

```Matlab
n = 0;
while (1)
printf('%o\n',n);
n = n+1;
end;
```

If a predefined sequence should be displayed, one can use

```Matlab
seq = 1:100;
dec2base(seq,8)
```

or

```Matlab
printf('%o\n',seq);
```

## Mercury

:- module count_in_octal.
:- interface.
:- import_module io.

:- pred main(io::di, io::uo) is det.

:- implementation.
:- import_module int, list, string.

main(!IO) :-
count_in_octal(0, !IO).

:- pred count_in_octal(int::in, io::di, io::uo) is det.

count_in_octal(N, !IO) :-
io.format("%o\n", [i(N)], !IO),
count_in_octal(N + 1, !IO).

```

## min

{{works with|min|0.19.3}}
min has no support for octal or base conversion (it is a minimalistic language, after all) so we need to do that ourselves.

```min
(
(dup 0 ==) (pop () 0 shorten)
(((8 mod) (8 div)) cleave) 'cons linrec
reverse 'print! foreach newline
) :octal

0 (dup octal succ)
9.223e18 int times ; close to max int value
```

ИП0	П1	1	0	/	[x]	П1	Вx	{x}	1
0	*	7	-	x=0	21	ИП1	x#0	28	БП
02	ИП0	1	+	П0	С/П	БП	00	ИП0	lg
[x]	1	+	10^x	П0	С/П	БП	00
```

```modula2
MODULE octal;

IMPORT  InOut;

VAR     num             : CARDINAL;

BEGIN
num := 0;
REPEAT
InOut.WriteOct (num, 12);           InOut.WriteLn;
INC (num)
UNTIL num = 0
END octal.
```

## NetRexx

```NetRexx
/* NetRexx */
options replace format comments java crossref symbols binary

import java.math.BigInteger

-- allow an option to change the output radix.
k_ = BigInteger
k_ = BigInteger.ZERO

loop forever
end

```

## NewLISP

```NewLISP
; file:   ocount.lsp
; url:    http://rosettacode.org/wiki/Count_in_octal
; author: oofoe 2012-01-29

; Although NewLISP itself uses a 64-bit integer representation, the
; format function relies on underlying C library's printf function,
; which can only handle a 32-bit octal number on this implementation.

(for (i 0 (pow 2 32)) (println (format "%o" i)))

(exit)
```

Sample output:

```txt
0
1
2
3
4
5
6
7
10
11
12
...

```

## Nim

```nim
import strutils
for i in 0 ..< int.high:
echo toOct(i, 16)
```

{{works with|oo2c}}

```oberon2

MODULE CountInOctal;
IMPORT
NPCT:Tools,
Out := NPCT:Console;
VAR
i: INTEGER;

BEGIN
FOR i := 0 TO MAX(INTEGER) DO;
Out.String(Tools.IntToOct(i));Out.Ln
END
END CountInOctal.

```

{{out}}

```txt

00000000000
00000000001
00000000002
00000000003
00000000004
00000000005
00000000006
00000000007
00000000010
00000000011
00000000012
00000000013
00000000014
00000000015
00000000016
00000000017
00000000020
00000000021
...
00000077757
00000077760
00000077761
00000077762
00000077763
00000077764
00000077765
00000077766
00000077767
00000077770
00000077771
00000077772
00000077773
00000077774
00000077775
00000077776
00000077777

```

## OCaml

```ocaml
let () =
for i = 0 to max_int do
Printf.printf "%o\n" i
done
```

{{out}}

```txt

0
1
2
3
4
5
6
7
10
11
12
...
7777777775
7777777776
7777777777

```

## PARI/GP

Both versions will count essentially forever; the universe will succumb to [[wp:Proton decay|proton decay]] long before the counter rolls over even in the 32-bit version.

Manual:

```parigp
oct(n)=n=binary(n);if(#n%3,n=concat([[0,0],][#n%3],n));forstep(i=1,#n,3,print1(4*n[i]+2*n[i+1]+n[i+2]));print;
n=0;while(1,oct(n);n++)
```

Automatic:
{{works with|PARI/GP|2.4.3 and above}}

```parigp
n=0;while(1,printf("%o\n",n);n++)
```

## Pascal

See [[Count_in_octal#Delphi | Delphi]] or {{works with|Free Pascal}}
old string incrementer for Turbo Pascal transformed, same as in http://rosettacode.org/wiki/Count_in_octal#Logo, about 100x times faster than Dephi-Version, with the abilty to used preformated strings leading zeroes.
Added a Bit fiddling Version IntToOctString, nearly as fast.

```pascal
{\$Mode Delphi}
{\$Optimization ON}
uses
sysutils;//IntToStr

const
maxCntOct = (SizeOf(NativeUint)*8+(3-1)) DIV 3;

procedure IntToOctString(i: NativeUint;var res:Ansistring);
var
p : array[0..maxCntOct] of byte;
c,cnt: LongInt;
begin
cnt := maxCntOct;
repeat
c := i AND 7;
p[cnt] := (c+Ord('0'));
dec(cnt);
i := i shr 3;
until (i = 0);
i := cnt+1;
cnt := maxCntOct-cnt;
//most time consuming with Ansistring
//call fpc_ansistr_unique
setlength(res,cnt);
move(p[i],res,cnt);
end;

procedure IncStr(var s:String;base:NativeInt);
var
le,c,dg:nativeInt;
begin
le := length(s);
IF le = 0 then
Begin
s := '1';
EXIT;
end;

repeat
dg := ord(s[le])-ord('0') +1;
c  := ord(dg>=base);
dg := dg-(base AND (-c));
s[le] := chr(dg+ord('0'));
dec(le);
until (c = 0) or (le<=0);

if (c = 1) then
begin
le := length(s);
setlength(s,le+1);
move(s,s,le);
s := '1';
end;
end;

const
MAX = 8*8*8*8*8*8*8*8*8;//8^9
var
sOct,
s  : AnsiString;
i : nativeInt;
T1,T0: TDateTime;
Begin
sOct := '';
For i := 1 to 16 do
Begin
IncStr(sOct,8);
writeln(i:10,sOct:10);
end;
writeln;

For i := 1 to 16 do
Begin
IntToOctString(i,s);
writeln(i:10,s:10);
end;

sOct := '';
T0 := time;
For i := 1 to MAX do
IncStr(sOct,8);
T0 := (time-T0)*86400;
writeln(sOct);

T1 := time;
For i := 1 to MAX do
IntToOctString(i,s);
T1 := (time-T1)*86400;
writeln(s);
writeln;
writeln(MAX);
writeln('IncStr         ',T0:8:3);
writeln('IntToOctString ',T1:8:3);
end.

```

{{out}}

```txt
1         1
2         2
3         3
4         4
5         5
6         6
7         7
8        10
9        11
10        12
11        13
12        14
13        15
14        16
15        17
16        20

1         1
2         2
3         3
4         4
5         5
6         6
7         7
8        10
9        11
10        12
11        13
12        14
13        15
14        16
15        17
16        20

1000000000
1000000000

134217728
IncStr            0.944 secs
IntToOctString    2.218 secs
```

## Perl

Since task says "system register", I take it to mean "no larger than machine native integer limit":

```perl
use POSIX;
printf "%o\n", \$_ for (0 .. POSIX::UINT_MAX);
```

Otherwise:

```perl
use bigint;
my \$i = 0;
printf "%o\n", \$i++ while 1
```

## Perl 6

```perl6
say .base(8) for ^Inf;
```

{{out}}

```txt
0
```

Here we arbitrarily show as many lines of output as there are lines in the program. :-)

## Phix

```Phix
integer i = 0
constant ESC = #1B
while not find(get_key(),{ESC,'q','Q'}) do
printf(1,"%o\n",i)
i += 1
end while

```

## PHP

```php

```

## PicoLisp

```PicoLisp
(for (N 0  T  (inc N))
(prinl (oct N)) )
```

## PL/I

Version 1:

```pli
/* Do the actual counting in octal. */
count: procedure options (main);
declare v(5) fixed(1) static initial ((5)0);
declare (i, k) fixed;

do k = 1 to 999;
call inc;
put skip edit ( (v(i) do i = 1 to 5) ) (f(1));
end;

inc: proc;
declare (carry, i) fixed binary;

carry = 1;
do i = 5 to 1 by -1;
v(i) = v(i) + carry;
if v(i) > 7 then
do; v(i) = v(i) - 8; if i = 1 then stop; carry = 1; end;
else
carry = 0;
end;
end inc;

end count;
```

Version 2:

```pli
count: procedure options (main); /* 12 Jan. 2014 */
declare (i, j) fixed binary;

do i = 0 upthru 2147483647;
do j = 30 to 0 by -3;
put edit (iand(isrl(i, j), 7) ) (f(1));
end;
put skip;
end;

end count;
```

{{out}}

```txt
(End of) Output of version 1
00000001173
00000001174
00000001175
00000001176
00000001177
00000001200
00000001201
00000001202
00000001203
00000001204
00000001205
00000001206
00000001207
00000001210
00000001211
00000001212
00000001213
00000001214
00000001215
00000001216

```

## PowerShell

```PowerShell
[int64]\$i = 0
While ( \$True )
{
[Convert]::ToString( ++\$i, 8 )
}
```

## Prolog

Rather than just printing out a list of octal numbers, this code will generate a sequence.
octal/1 can also be used to tell if a number is a valid octal number or not.
octalize will keep producing and printing octal number, there is no limit.

```Prolog
o(O) :- member(O, [0,1,2,3,4,5,6,7]).

octal([O]) :- o(O).
octal([A|B]) :-
octal(O),
o(T),
append(O, [T], [A|B]),
dif(A, 0).

octalize :-
forall(
octal(X),
(maplist(write, X), nl)
).
```

## PureBasic

```PureBasic
Procedure.s octal(n.q)
Static Dim digits(20)
Protected i, j, result.s
For i = 0 To 20
digits(i) = n % 8
n / 8
If n < 1
For j = i To 0 Step -1
result + Str(digits(j))
Next
Break
EndIf
Next

ProcedureReturn result
EndProcedure

Define n.q
If OpenConsole()
While n >= 0
PrintN(octal(n))
n + 1
Wend

Print(#CRLF\$ + #CRLF\$ + "Press ENTER to exit"): Input()
CloseConsole()
EndIf

```

Sample output:

```txt
0
1
2
3
4
5
6
7
10
11
12
...
777777777777777777767
777777777777777777770
777777777777777777771
777777777777777777772
777777777777777777773
777777777777777777774
777777777777777777775
777777777777777777776
777777777777777777777
```

## Python

```Python
import sys
for n in xrange(sys.maxint):
print oct(n)
```

## Racket

```racket

#lang racket
(for ([i (in-naturals)])
(displayln (number->string i 8)))

```

(Racket has bignums, so this loop will never end.)

## Retro

Integers in Retro are signed.

```Retro
octal
17777777777 [ putn cr ] iter
```

## REXX

If this REXX program wouldn't be stopped, it would count ''forever''.

```rexx
/*REXX program counts in octal until the number exceeds #pgm statements.*/
/*┌────────────────────────────────────────────────────────────────────┐
│ Count all the protons  (and electrons!)  in the universe.          │
│                                                                    │
│ According to Sir Arthur Eddington in 1938 at his Tamer Lecture at  │
│ Trinity College (Cambridge), he postulated that there are exactly  │
│                                                                    │
│                              136 ∙ 2^256                           │
│                                                                    │
│ protons in the universe,  and the same number of electrons,  which │
│ is equal to around  1.57477e+79.                                   │
│                                                                    │
│ [Although, a modern estimate is around  10^80.]                    │
└────────────────────────────────────────────────────────────────────┘*/
numeric digits 100000                  /*handle almost all big numbers. */
numIn=right('number in', 20)           /*used for indentation of output.*/
w=length(sourceline())                 /*used for formatting width of #s*/

do #=0  to 136 * (2**256)            /*Sir Eddington, here we come !  */
!=x2b( d2x(#) )
_=right(!,  3 * (length(_) % 3 + 1),  0)
o=
do k=1  to length(_)  by 3
o=o'0'substr(_,k,3)
end   /*k*/

say numIn 'base ten = ' right(#,w) numIn  "octal = " right(b2x(o)+0,w+w)
if #>sourceline()  then leave        /*stop if #protons>pgm statements*/
end   /*#*/
/*stick a fork in it, we're done.*/
```

'''output'''
number in base ten =   0            number in octal =     0
number in base ten =   1            number in octal =     1
number in base ten =   2            number in octal =     2
number in base ten =   3            number in octal =     3
number in base ten =   4            number in octal =     4
number in base ten =   5            number in octal =     5
number in base ten =   6            number in octal =     6
number in base ten =   7            number in octal =     7
number in base ten =   8            number in octal =    10
number in base ten =   9            number in octal =    11
number in base ten =  10            number in octal =    12
number in base ten =  11            number in octal =    13
number in base ten =  12            number in octal =    14
number in base ten =  13            number in octal =    15
number in base ten =  14            number in octal =    16
number in base ten =  15            number in octal =    17
number in base ten =  16            number in octal =    20
number in base ten =  17            number in octal =    21
number in base ten =  18            number in octal =    22
number in base ten =  19            number in octal =    23
number in base ten =  20            number in octal =    24
number in base ten =  21            number in octal =    25
number in base ten =  22            number in octal =    26
number in base ten =  23            number in octal =    27
number in base ten =  24            number in octal =    30
number in base ten =  25            number in octal =    31
number in base ten =  26            number in octal =    32
number in base ten =  27            number in octal =    33
number in base ten =  28            number in octal =    34
number in base ten =  29            number in octal =    35
number in base ten =  30            number in octal =    36
number in base ten =  31            number in octal =    37

```

## Ring

```ring

size = 30
for n = 1 to size
see octal(n) + nl
next

func octal m
output = ""
w = m
while fabs(w) > 0
oct = w & 7
w = floor(w / 8)
output = string(oct) + output
end
return output

```

## Ruby

From the [http://www.ruby-doc.org/core/Fixnum.html documentation]: "A Fixnum holds Integer values that can be represented in a native machine word (minus 1 bit). If any operation on a Fixnum exceeds this range, the value is automatically converted to a Bignum."

```ruby
n = 0
loop do
puts "%o" % n
n += 1
end

# or
for n in 0..Float::INFINITY
puts n.to_s(8)
end

# or
0.upto(1/0.0) do |n|
printf "%o\n", n
end

# version 2.1 later
0.step do |n|
puts format("%o", n)
end
```

## Run BASIC

```runbasic
input "Begin number:";b
input "  End number:";e

for i = b to e
print i;" ";toBase\$(8,i)
next i
end

function toBase\$(base,base10)
for i = 10 to 1 step -1
toBase\$   = str\$(base10 mod base) +toBase\$
base10    = int(base10 / base)
if base10 < 1 then exit for
next i
end function
```

## Rust

```rust
fn main() {
for i in 0..std::usize::MAX {
println!("{:o}", i);
}
}
```

## Salmon

Salmon has built-in unlimited-precision integer arithmetic, so these examples will all continue printing octal values indefinitely, limited only by the amount of memory available (it requires O(log(n)) bits to store an integer n, so if your computer has 1 GB of memory, it will count to a number with on the order of $2^\left\{80\right\}$ octal digits).

```Salmon
iterate (i; [0...+oo])
printf("%o%\n", i);;
```

or

```Salmon
for (i; 0; true)
printf("%o%\n", i);;
```

or

```Salmon
variable i := 0;
while (true)
{
printf("%o%\n", i);
++i;
};
```

## Scala

```scala
Stream from 0 foreach (i => println(i.toOctalString))
```

## Scheme

```scheme
(do ((i 0 (+ i 1))) (#f) (display (number->string i 8)) (newline))
```

## Scratch

[[File:ScratchCountInOctal.png]]

## Seed7

This example uses the [http://seed7.sourceforge.net/libraries/integer.htm#%28in_integer%29radix%28in_integer%29 radix] operator to write a number in octal.

```seed7
\$ include "seed7_05.s7i";

const proc: main is func
local
var integer: i is 0;
begin
repeat
incr(i);
until FALSE;
end func;
```

## Sidef

```ruby
var i = 0;
loop { say i++.as_oct }
```

## Sparkling

```sparkling
for (var i = 0; true; i++) {
printf("%o\n", i);
}
```

## Standard ML

```sml
local
fun count n = (print (Int.fmt StringCvt.OCT n ^ "\n"); count (n+1))
in
val _ = count 0
end
```

## Swift

```swift
import Foundation

func octalSuccessor(value: String) -> String {
if value.isEmpty {
return "1"
} else {
let i = value.startIndex, j = value.endIndex.predecessor()
switch (value[j]) {
case "0": return value[i..printf(1) to print it in octal. Our loop stops when the counter overflows to negative.

```sh
#!/bin/sh
num=0
while test 0 -le \$num; do
printf '%o\n' \$num
num=`expr \$num + 1`
done
```

Various recent shells have a bultin `\$(( ... ))` for arithmetic rather than running `expr`, in which case

{{works with|bash}}
{{works with|pdksh|5.2.14}}

```sh
num=0
while test 0 -le \$num; do
printf '%o\n' \$num
num=\$((num + 1))
done
```

## VBA

With i defined as an Integer, the loop will count to 77777 (32767 decimal). Error handling added to terminate nicely on integer overflow.

```VBA

Sub CountOctal()
Dim i As Integer
i = 0
On Error GoTo OctEnd
Do
Debug.Print Oct(i)
i = i + 1
Loop
OctEnd:
Debug.Print "Integer overflow - count terminated"
End Sub

```

## VBScript

```vb

For i = 0 To 20
WScript.StdOut.WriteLine Oct(i)
Next

```

## Vim Script

```vim
let counter = 0
while counter >= 0
echon printf("%o\n", counter)
let counter += 1
endwhile
```

## Whitespace

This program prints octal numbers until the internal representation of the current integer overflows to -1; it will never do so on some interpreters.

```Whitespace

```

It was generated from the following pseudo-Assembly.

```asm
push 0
; Increment indefinitely.
0:
push -1 ; Sentinel value so the printer knows when to stop.
copy 1
call 1
push 10
ochr
push 1
jump 0
; Get the octal digits on the stack in reverse order.
1:
dup
push 8
mod
swap
push 8
div
push 0
copy 1
sub
jn 1
pop
; Print them.
2:
dup
jn 3 ; Stop at the sentinel.
onum
jump 2
3:
pop
ret
```

## XPL0

XPL0 doesn't have built-in routines to handle octal; instead it uses hex.

```XPL0
include c:\cxpl\codes;     \intrinsic code declarations

proc OctOut(N);    \Output N in octal
int N;
int R;
[R:= N&7;
N:= N>>3;
if N then OctOut(N);
ChOut(0, R+^0);
];

int I;
[I:= 0;
repeat  OctOut(I); CrLf(0);
I:= I+1;
until KeyHit or I=0;
]
```

Example output:

```txt

0
1
2
3
4
5
6
7
10
11
12
13
14
15
16
17
20
21

```

## zig

```zig
const std = @import("std");
const fmt = std.fmt;
const warn = std.debug.warn;

pub fn main() void {
var i: u8 = 0;
var buf: u8 = undefined;

while (i < 255) : (i += 1) {
_ = fmt.formatIntBuf(buf[0..], i, 8, false, 0); // buffer, value, base, uppercase, width
warn("{}\n", buf);
}
}
```

## zkl

```zkl
foreach n in ([0..]){println("%.8B".fmt(n))}
```

{{out}}

```txt

0
1
2
3
4
5
6
7
10
11
12

```

## ZX Spectrum Basic

```zxbasic
10 PRINT "DEC.  OCT."
20 FOR i=0 TO 20
30 LET o\$="": LET n=i
40 LET o\$=STR\$ FN m(n,8)+o\$
50 LET n=INT (n/8)
60 IF n>0 THEN GO TO 40
70 PRINT i;TAB 3;" = ";o\$
80 NEXT i
90 STOP
100 DEF FN m(a,b)=a-INT (a/b)*b
```

```