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signbit

Section: Mathematical Library Functions (3M)
Updated: 12 Jul 2006
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NAME

signbit - test sign  

SYNOPSIS

c99 [ flag... ] file... -lm [ library... ]
#include <math.h>

int signbit(real-floating x);  

DESCRIPTION

The signbit() macro determines whether the sign of its argument value is negative. NaNs, zeros, and infinities have a sign bit.  

RETURN VALUES

The signbit() macro returns a non-zero value if and only if the sign of its argument value is negative.  

ERRORS

No errors are defined.  

ATTRIBUTES

See attributes(5) for descriptions of the following attributes:

ATTRIBUTE TYPEATTRIBUTE VALUE
Interface StabilityStandard
MT-LevelMT-Safe

 

SEE ALSO

fpclassify(3M), isfinite(3M), isinf(3M), isnan(3M), isnormal(3M), math.h(3HEAD), attributes(5), standards(5)


 

Index

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUES
ERRORS
ATTRIBUTES
SEE ALSO

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Time: 02:39:34 GMT, October 02, 2010