SIGNBIT(3M) Mathematical Library Functions SIGNBIT(3M)

NAME

signbit - 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(7) for descriptions of the following attributes:


+----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+----------------------------+-----------------------------+
|Interface Stability | Standard |
+----------------------------+-----------------------------+
|MT-Level | MT-Safe |
+----------------------------+-----------------------------+

SEE ALSO

math.h(3HEAD), fpclassify(3M), isfinite(3M), isinf(3M), isnan(3M),
isnormal(3M), attributes(7), standards(7)

SunOS 5.11 July 12, 2006 SIGNBIT(3M)