Rechercher une page de manuel
signbit
Langue: en
Version: 2002-08-10 (openSuse - 09/10/07)
Section: 3 (Bibliothèques de fonctions)
NAME
signbit - test sign of a real floating point numberSYNOPSIS
#include <math.h>int signbit(X);
Compile with -std=c99; link with -lm.
DESCRIPTION
`signbit' is a generic macro which can work on all real floating-point types. It returns a non-zero value if the value of X has its sign bit set.This is not the same as `x < 0.0', because IEEE 754 floating point allows zero to be signed. The comparison `-0.0 < 0.0' is false, but `signbit (-0.0)' will return a non-zero value.
CONFORMING TO
C99. This function is defined in IEC 559 (and the appendix with recommended functions in IEEE 754/IEEE 854).SEE ALSO
copysign(3)Contenus ©2006-2024 Benjamin Poulain
Design ©2006-2024 Maxime Vantorre