V8/usr/man/man3/arith.3

.TH ARITH 3
.SH NAME
abs, sgn,
gcd, lcm, min, max \- integer arithmetic functions:
absolute value, sign,
greatest common divisor, least common multiple, minimum, maximum
.SH SYNOPSIS
.B abs(a)
.PP
.B sgn(a)
.PP
.B gcd(a, b)
.PP
.B long lcm(a, b)
.PP
.B min(a, b)
.PP
.B max(a, b)
.SH DESCRIPTION
.I Abs
returns
the absolute value of 
.I a.
.PP
.I Sgn
returns \-1, 0, 1, according as
.IR a <0,
.IR a =0,
.IR a >0.
.PP
.I Gcd
returns the largest positive integer that divides both
.I a
and
.I b,
except that gcd(0, 0) = 0.
.PP
.I Lcm
satisfies
.IP
lcm(\fIa, b\fR) = abs(\fIab\fR/gcd(\fIa, b\fR))
.LP
except that lcm(0, 0) = 0.
.PP
.I Min
.RI ( max )
returns the minimum (maximum) of
.I a
and
.I b.
.SH SEE ALSO
floor(3) for
.I fabs
.SH DIAGNOSTICS
.I Abs
and
.I gcd
return
.I \-X,
the most negative integer, when the true result is the unrepresentable value
.I X.
.SH BUGS
The result of
.I lcm
is undefined when it doesn't fit in a long.