SIGNBIT(3M) Mathematical Library Functions SIGNBIT(3M)
signbit - test sign
c99 [ flag... ] file... -lm [ library... ]
#include <math.h>
int signbit(real-floating x);
The signbit() macro determines whether the sign of its argument value
is negative. NaNs, zeros, and infinities have a sign bit.
The signbit() macro returns a non-zero value if and only if the sign
of its argument value is negative.
No errors are defined.
See attributes(7) for descriptions of the following attributes:
+----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+----------------------------+-----------------------------+
|Interface Stability | Standard |
+----------------------------+-----------------------------+
|MT-Level | MT-Safe |
+----------------------------+-----------------------------+
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)
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)