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COPYSIGN(3) FreeBSD 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 recommended
by IEEE Std 754-1985.
HISTORY
The copysign(), copysignf(), and copysignl() functions appeared in
4.3BSD, FreeBSD 2.0, and FreeBSD 5.3, respectively.
FreeBSD 14.0-RELEASE-p6 January 26, 2005 FreeBSD 14.0-RELEASE-p6