Category:Dc: Difference between revisions
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(Expand the quick reference to cover OpenBSD dc.) |
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}}dc is the unix desktop calculator. It uses a reverse polish notation and is turing complete. |
}}dc is the unix desktop calculator. It uses a reverse polish notation and is turing complete. |
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== Quick reference == |
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Commands in |
Commands in [[AT&T dc]] |
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number : push a number |
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number : push a number (0-9A-F digits, _ negative, . radix point) |
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[...] : push a string |
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⚫ | |||
⚫ | |||
⚫ | |||
d : duplicate top of the stack |
d : duplicate top of the stack |
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⚫ | |||
⚫ | |||
f : show stack |
f : show stack |
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p : print value with a newline, leave it on the stack |
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P : print string, or print number as ASCII string |
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sx : store to register x |
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lx : load from register x |
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Sx : push to register x |
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Lx : pop register x |
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a b :x : store x[b] = a (x is register) |
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⚫ | |||
<x >x =x : compare top 2 values: if true, then execute register x |
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!>x !<x !=x : (example: 5 2 <A executes register A if 2 < 5) |
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! : shell command |
! : shell command |
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q : quit, or break 2 execution levels |
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n Q : break n execution levels |
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i : set input radix from top of stack |
i : set input radix from top of stack |
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I : |
I : get current input base, push it on stack |
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o : set output radix from top of stack |
o : set output radix from top of stack |
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O : |
O : get current output base, push it on stack |
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k : set scale factor |
k : set scale factor |
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K : get current scale factor |
K : get current scale factor |
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x : execute a string of dc commands |
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X : count decimal digits after decimal point |
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z : count elements on the stack |
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Z : count all decimal digits in number, or characters in string |
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⚫ | |||
Y : debug information |
Y : debug information |
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a b :r : store r[b] = a (r is register) |
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⚫ | |||
Extensions in both [[GNU dc]] and [[OpenBSD dc]] |
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GNU Extensions |
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n : print value without a newline |
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~ : divmod: division and remainder |
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⚫ | |||
⚫ | |||
Extension in [[GNU dc]] |
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⚫ | |||
⚫ | |||
| : arithmetic - modular exponentiation |
| : arithmetic - modular exponentiation |
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⚫ | |||
Extensions in [[OpenBSD dc]] |
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⚫ | |||
n J : break n execution levels, then jump to next M |
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!>r !<r !=r : execute contents of register x based on comparison |
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M : mark for the J command |
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a N : boolean not: push 1 if a == 0, else push 0 |
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<xey >xey : comparisons with an else branch: if true, |
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=xey !<xey : then execute register x |
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!>xey !=xey : else execute register y |
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a b G : equality: push 1 if b == a, else push 0 |
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a b ( : less than: push 1 if b < a, else push 0 |
Revision as of 02:41, 8 March 2011
Dc
This programming language may be used to instruct a computer to perform a task.
Listed below are all of the tasks on Rosetta Code which have been solved using Dc.
This programming language may be used to instruct a computer to perform a task.
Execution method: | Interpreted |
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Type checking: | Dynamic |
See Also: |
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dc is the unix desktop calculator. It uses a reverse polish notation and is turing complete.
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 a b :x : store x[b] = a (x is register) a ;x : retrieve x[b] <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 n Q : break n 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
n J : break n execution levels, then jump to next M M : mark for the J command a N : boolean not: push 1 if a == 0, else push 0 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 a b G : equality: push 1 if b == a, else push 0 a b ( : less than: push 1 if b < a, else push 0
Subcategories
This category has the following 3 subcategories, out of 3 total.
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- Dc Implementations (4 P)
- Dc User (10 P)
Pages in category "Dc"
The following 90 pages are in this category, out of 90 total.