isnan(3p) - phpMan

ISNAN(P)                                                              ISNAN(P)



NAME
       isnan - test for a NaN

SYNOPSIS
       #include <math.h>

       int isnan(real-floating x);


DESCRIPTION
       The  isnan()  macro  shall determine whether its argument value is a NaN. First, an
       argument represented in a format wider than its semantic type is converted  to  its
       semantic type. Then determination is based on the type of the argument.

RETURN VALUE
       The  isnan()  macro shall return a non-zero value if and only if its argument has a
       NaN value.

ERRORS
       No errors are defined.

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       None.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       fpclassify() , isfinite() , isinf() , isnormal() , signbit() , the Base Definitions
       volume of IEEE Std 1003.1-2001, <math.h>

COPYRIGHT
       Portions of this text are reprinted and reproduced in electronic form from IEEE Std
       1003.1, 2003 Edition, Standard for Information  Technology  --  Portable  Operating
       System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C)
       2001-2003 by the Institute of Electrical and Electronics  Engineers,  Inc  and  The
       Open  Group.  In the event of any discrepancy between this version and the original
       IEEE and The Open Group Standard, the original IEEE and The Open Group Standard  is
       the   referee   document.   The   original  Standard  can  be  obtained  online  at
       http://www.opengroup.org/unix/online.html .



POSIX                                2003                             ISNAN(P)

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