SIGNBIT
Section: libc math functions (3)
Updated: 20020810
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NAME
signbit  test sign of a real floating point number
SYNOPSIS
#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 floatingpoint
types. It returns a nonzero 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 nonzero 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)
Index
 NAME

 SYNOPSIS

 DESCRIPTION

 CONFORMING TO

 SEE ALSO

linux.jgfs.net manual pages