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)
July 12, 2006 | SunOS 5.11 |