Category:Dc: Difference between revisions

Dc
This programming language may be used to instruct a computer to perform a task.

Execution method:	Interpreted
Type checking:	Dynamic
See Also:	Dc on the HOPL

Listed below are all of the tasks on Rosetta Code which have been solved using Dc.

dc is the unix desktop calculator. It uses a reverse polish notation and is turing complete.

Commands in POSIX dc

number      : push a number
+ - / * % ^ : arithmetic operations: add sub div mul mod exp
sx Sx       : pop the stack and save or push it to register x
lx Lx       : copy | pop the register x to main stack.
d           : duplicate top of the stack
p           : print top of the stack
P           : pop and print String
f           : show stack
q           : exit (drop execution stack by 2)
Q           : drop execution stack by top of the stack number
x           : execute dc commands on top of the stack
X           : replace top of stack by its scale factor.
[...]       : string notation
<x >x =x    : compare 2 elements at top of the stack, and execute register x
v           : square root
!           : shell command
c           : clear
i           : set input radix from top of stack
I           : push input base on the top of the stack.
o           : set output radix from top of stack
O           : push output base on the top of the stack.
k           : set scale factor
K           : get current scale factor
z           : get the current stack level.
Z           : get the character length of element at top of stack
?           : read input and execute.
Y           : debug information
a b :r      : store r[b] = a (r is register)
a ;r        : retrieve r[b]

GNU Extensions

n           : print value without a new line
~           : arithmetic - divmod
|           : arithmetic - modular exponentiation
r           : swap the top two elements
a           : asciify
!>r !<r !=r : execute contents of register x based on comparison
X           : pushes the number of fractional digits
#           : comment