Manual Pages  — COPYSIGN

copysign, copysignf, copysignl – copy sign

LIBRARY SYNOPSIS DESCRIPTION SEE ALSO STANDARDS HISTORY

Math Library (libm, -lm)

#include <math.h>

double
copysign(double x, double y);

float
copysignf(float x, float y);

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

The copysign(), copysignf() and copysignl() functions return x with its sign changed to y, Ns, 's.

The copysign(), copysignf(), and copysignl() routines conform to ISO/IEC 9899:1999 ("ISO C99"). They implement the Copysign function recommended by -ieee754.

The copysign(), copysignf(), and copysignl() functions appeared in BSD 4.3, FreeBSD 2.0, and FreeBSD 5.3, respectively.