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FreeBSD 11.0 - man page for copysign (freebsd section 3)

COPYSIGN(3)						   BSD Library Functions Manual 					       COPYSIGN(3)

NAME
copysign, copysignf, copysignl -- copy sign
LIBRARY
Math Library (libm, -lm)
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(), copysignf() and copysignl() functions return x with its sign changed to y's.
SEE ALSO
fabs(3), fdim(3), ieee(3), math(3)
STANDARDS
The copysign(), copysignf(), and copysignl() routines conform to ISO/IEC 9899:1999 (``ISO C99''). They implement the Copysign function rec- ommended by IEEE Std 754-1985.
HISTORY
The copysign(), copysignf(), and copysignl() functions appeared in 4.3BSD, FreeBSD 2.0, and FreeBSD 5.3, respectively.
BSD
January 26, 2005 BSD