signbit(3M) Mathematical Library Functions signbit(3M)
NAME
signbit - test sign
SYNOPSIS
#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 ALSO
fpclassify(3M), isfinite(3M), isinf(3M), isnan(3M), isnormal(3M), math.h(3HEAD), attributes(5), standards(5)
SunOS 5.10 1 Nov 2003 signbit(3M)