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c99 [ flag... ] file... -lm [ library... ] #include <math.h>
double copysign(double x, double y);
float copysignf(float x, float y);
long double copysignl(long double x, long double y);
These functions produce a value with the magnitude of x and the sign of y.
Upon successful completion, these functions return a value with the magnitude of x and the sign of y.
See attributes(5) for descriptions of the following attributes:
ATTRIBUTE TYPE | ATTRIBUTE VALUE |
Interface Stability | Standard |
MT-Level | MT-Safe |
math.h(3HEAD), signbit(3M),attributes(5), standards(5)