copysign, copysignf : sign of y, magnitude of x

Synopsis

#include <math.h>
double copysign (double x, double y);
float copysignf (float x, float y);
```### Description

copysign constructs a number with the magnitude (absolute value) of its first argument, x, and the sign of its second argument, y. copysignf does the same thing; the two functions differ only in the type of their arguments and result.### Returns

copysign returns a double with the magnitude of x and the sign of y. copysignf returns a float with the magnitude of x and the sign of y.

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**Authoritative source**: BUSMASTER DITA help source `copysign.dita`, compiled into `BUSMASTER.CHM` with the application.