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Mathematical Library Functionsisnan(3M)


NAME

 isnan - test for NaN

SYNOPSIS

 
cc [ flag ... ] file ... -lm [ library ... ]
#include <math.h>
int isnan(double x);

DESCRIPTION

 

The isnan() function tests whether x is NaN.

RETURN VALUES

 

The isnan() function returns non-zero if x is NaN. Otherwise, 0 is returned.

USAGE

 

On systems not supporting NaN, isnan() always returns 0.

ATTRIBUTES

 

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

ATTRIBUTE TYPEATTRIBUTE VALUE
MT-LevelMT-Safe

SEE ALSO

 

attributes(5)


SunOS 5.9Go To TopLast Changed 29 Dec 1996

 
      
      
Copyright 2002 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms.