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Manual Reference Pages  - COPYSIGN (3)

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copysign, copysignf, copysignl - copy sign of a number

CONTENTS

Synopsis
Description
Notes

#include <math.h> 



double copysign(double x, double y); 




float copysignf(float x, float y); 




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

The copysign() functions return a value whose absolute value matches that of x, but whose sign matches that of y. If x is a NaN, then a NaN with the sign of y is returned.

The copysign() functions may treat a negative zero as positive.

C99, BSD 4.3. This function is defined in IEC 559 (and the appendix with recommended functions in IEEE 754/IEEE 854).

signbit(3)

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