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{{language
{{language}}dc is the unix desktop calculator. It uses a reverse polish notation and is turing complete.▼
|exec=interpreted
|checking=dynamic
|hopl id=1957
}}
{{language programming paradigm|concatenative}}
[[Category:Utility]]
[[wp:dc (computer program)|dc]] is the unix '''d'''esktop '''c'''alculator. <br>
▲
;See also
* [[:Category:Bc|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 =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 >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
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