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RedHat 9 (Linux i386) - man page for copysign (redhat section 3)

COPYSIGN(3)			    Linux Programmer's Manual			      COPYSIGN(3)

NAME
       copysign, copysignf, copysignl - copy sign of a number

SYNOPSIS
       #include <math.h>

       double copysign(double x, double y);
       float copysignf(float x, float y);
       long double copysignl(long double x, long double y);

DESCRIPTION
       The  copysign() functions return a value whose absolute value matches that of x, but whose
       sign matches that of y.	If x is a NaN, then a NaN with the sign of y is returned.

NOTES
       The copysign() functions may treat a negative zero as positive.

CONFORMING TO
       C99, BSD 4.3.  This function is defined in IEC 559  (and  the  appendix	with  recommended
       functions in IEEE 754/IEEE 854).

SEE ALSO
       signbit(3)

GNU					    2002-08-10				      COPYSIGN(3)


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