Handbook
Glossary
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gcd ( x y -- a d )
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Mathematical functions
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Integer functions
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Vocabulary
math
Inputs
x
an
integer
y
an
integer
Outputs
a
an
integer
d
an
integer
Word description
Computes the positive greatest common divisor
d
of
x
and
y
, and another value
a
satisfying:
a*y = d mod x
Notes
If
d
is 1, then
a
is the inverse of
y
modulo
x
.
Definition
USING:
kernel
math.private
;
IN:
math
:
gcd
( x y -- a d )
[
0 1
]
2dip
(gcd)
dup
0
<
[
neg
]
when
;
inline