signbit man page on CentOS

signbit man page on CentOS

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SIGNBIT(3)		      libc math functions		    SIGNBIT(3)

NAME
       signbit - test sign of a real floating point number

SYNOPSIS
       #include <math.h>

       int signbit (X);

       Compile with -std=c99; link with -lm.

DESCRIPTION
       `signbit'  is a generic macro which can work on all real floating-point
       types.  It returns a non-zero value if the value of X has its sign  bit
       set.

       This  is	 not  the  same	 as `x < 0.0', because IEEE 754 floating point
       allows zero to be signed.  The comparison `-0.0 < 0.0'  is  false,  but
       `signbit (-0.0)' will return a non-zero value.

CONFORMING TO
       C99.  This function is defined in IEC 559 (and the appendix with recom‐
       mended functions in IEEE 754/IEEE 854).

SEE ALSO
       copysign(3)

GNU				  2002-08-10			    SIGNBIT(3)

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