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
