signbit(3M) Mathematical Library Functions signbit(3M)NAMEsignbit - test sign
SYNOPSIS
c99 [ flag... ] file... -lm [ library... ]
#include <math.h>
int signbit(real-floating x);
DESCRIPTION
The signbit() macro determines whether the sign of its argument value
is negative. NaNs, zeros, and infinities have a sign bit.
RETURN VALUES
The signbit() macro returns a non-zero value if and only if the sign of
its argument value is negative.
ERRORS
No errors are defined.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
┌─────────────────────────────┬─────────────────────────────┐
│ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
├─────────────────────────────┼─────────────────────────────┤
│Interface Stability │Standard │
├─────────────────────────────┼─────────────────────────────┤
│MT-Level │MT-Safe │
└─────────────────────────────┴─────────────────────────────┘
SEE ALSOfpclassify(3M), isfinite(3M), isinf(3M), isnan(3M), isnormal(3M),
math.h(3HEAD), attributes(5), standards(5)SunOS 5.10 12 Jul 2006 signbit(3M)