2.1.31 static double copysign
static double copysign(double __x, double __y)
The copysign() function returns __x but with the sign of __y. They work even if __x or __y are NaN or zero.
static double copysign(double __x, double __y)
The copysign() function returns __x but with the sign of __y. They work even if __x or __y are NaN or zero.