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Man Pages
COPYSIGN(3) FreeBSD Library Functions Manual COPYSIGN(3)

copysign, copysignf, copysignl
copy sign

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's.

fabs(3), fdim(3), ieee(3), math(3)

The copysign(), copysignf(), and copysignl() routines conform to ISO/IEC 9899:1999 (“ISO C99”). They implement the Copysign function recommended by IEEE Std 754-1985.

The copysign(), copysignf(), and copysignl() functions appeared in 4.3BSD, FreeBSD 2.0, and FreeBSD 5.3, respectively.
January 26, 2005 FreeBSD 13.1-RELEASE

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