The function copysign produces a value with the magnitude of x and the sign of y

This function is compatible with the following targets:

ANSI

BeOS

EMB/RTOS

Mac OS

Palm OS

Win32

#include <math.h>

double copysign ( double x, double y );

Parameters for this function are:

x	double	Magnitude
y	double	The sign argument

The copysign function regards the sign of zero as positive. It produces a NaN with the sign of y if x is NaN.

A value with the magnitude of x and the sign of y.