copysign(), copysignf(), copysignl() — Copy the sign from one floating-point number to another

Standards

Format

#define _AIX_COMPATIBILITY
#include <math.h>
#include <float.h>

double copysign(double x, double y);

#define _ISOC99_SOURCE
#include <math.h>
#include <float.h>

float copysignf(float x, float y);
long double copysignl(long double x, long  double y);

#define _TR1_C99
#include <math.h>

float copysign(float x, float y); 
long double copysign(long double x, long double y);

General description

The copysign functions produce a value with the magnitude of x and the sign of y.

Returned value

The copysign functions return a value with the magnitude of x and the sign of y.

Related information

• float.h
• math.h
• ilogb(), ilogbf(), ilogbl() — Integer unbiased exponent
• logb(), logbf(), logbl() — Unbiased exponent
• nextafter(), nextafterf(), nextafterl() — Next representable double float
• scalb() — Load exponent