Dc

Category:Utility

dc is the unix '''d'''esktop '''c'''alculator.

It uses a reverse polish notation and is turing complete.

;See also

  • bc - '''b'''asic '''c'''alculator

Quick reference

Commands in AT&T dc number : push a number (0-9A-F digits, _ negative, . radix point) [...] : push a string

      • / % ^ : arithmetic operations: add sub mul div mod pow v : square root c : clear stack d : duplicate top of the stack f : show stack p : print value with a newline, leave it on the stack P : print string, or print number as ASCII string sx : store to register x lx : load from register x Sx : push to register x Lx : pop register x 1 2 :x : store x[2] = 1 (x is register) 2 ;x : retrieve x[2] x =x : compare top 2 values: if true, then execute register x !>x !<x !=x : (example: 5 2 <A executes register A if 2 < 5) ! : shell command q : quit, or break 2 execution levels 3 Q : break 3 execution levels i : set input radix from top of stack I : get current input base, push it on stack o : set output radix from top of stack O : get current output base, push it on stack k : set scale factor K : get current scale factor x : execute a string of dc commands X : count decimal digits after decimal point z : count elements on the stack Z : count all decimal digits in number, or characters in string ? : read and execute one line of input Y : debug information

Extensions in both GNU dc and OpenBSD dc a : print ASCII character n : print value without a newline ~ : divmod: division and remainder r : reverse (swap) the top two elements

: comment

Extension in GNU dc | : arithmetic - modular exponentiation

Extensions in OpenBSD dc 3 J : break 3 execution levels, then jump to next M M : mark for the J command R : pop and discard top of the stack xey : comparisons with an else branch: if true, =xey !<xey : then execute register x !>xey !=xey : else execute register y 1 2 G : equality: push 1 if 2 == 1, else push 0 1 2 ( : less than: push 1 if 2 < 1, else push 0 3 N : boolean not: push 1 if 3 == 0, else push 0

Tasks