double
     copysign(double x, double y);

     long double
     copysignl(long double x, long double y);

     float
     copysignf(float x, float y);

DESCRIPTION

     The copysign() functions return x with its sign changed to y's.

SPECIAL VALUES

     copysign(x, y) returns a NaN (with y's sign) if x is a NaN.

STANDARDS

     The copysign() functions conform to ISO/IEC 9899:1999(E).

BSD                              July 2, 2003                              BSD