sunos man page for signbit

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)