GNU/Linux man pages
Livre :
Expressions régulières,
Syntaxe et mise en oeuvre :
GNU/Linux |
CentOS 5.5 |
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copysignl(3) |
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copysign, copysignf, copysignl − copy sign of a number
#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.
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, 4.3BSD. This function is defined in IEC 559 (and the appendix with recommended functions in IEEE 754/IEEE 854).
signbit(3)
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copysignl(3) | |