copysign, copysignf, copysignl: kopírovat znak čísla

Originální popis anglicky: copysign, copysignf, copysignl - copy sign of a number

Návod, kniha: Linux Programmer's Manual

STRUČNĚ

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

Link with -lm.

POPIS / INSTRUKCE

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.

NOTES

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

ODPOVÍDAJÍCÍ

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

SOUVISEJÍCÍ

signbit(3)