MirBSD manpage: copysign(3), copysignf(3)

COPYSIGN(3)                BSD Programmer's Manual                 COPYSIGN(3)

NAME

     copysign, copysignf - functions to manipulate signs

LIBRARY

     libm

SYNOPSIS

     #include <math.h>

     double
     copysign(double x, double y);

     float
     copysignf(float x, float y);

DESCRIPTION

     The copysign() and copysignf() functions return a value whose absolute
     value matches x, but whose sign bit is taken from y.

RETURN VALUES

     Upon successful completion, all three functions return a value with the
     magnitude of x and the sign of y. If x is NaN , the functions return a
     NaN with the sign of y.

SEE ALSO

     math(3), signbit(3)

STANDARDS

     The described functions conform to ISO/IEC 9899:1999 ("ISO C99").

CAVEATS

     Note that on implementations that represent a signed zero but do not
     treat negative zero consistently in arithmetic operations, these func-
     tions may regard the sign of zero as positive.

MirBSD #10-current             February 9, 2014                              1