Category:Dc: Difference between revisions

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Sx : push to register x

Lx : pop register x

a b :x : store x[b] = a (x is register)

1 2 :x : store x[2] = 1 (x is register)

a ;x : retrieve x[b]

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

n Q : break n 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

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Extensions in [[OpenBSD dc]]

n J : break n execution levels, then jump to next M

3 J : break 3 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

1 2 G : equality: push 1 if 2 == 1, else push 0

a b ( : less than: push 1 if b < a, 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