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ISNAN(P)			    POSIX Programmer's Manual				 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 orig-
       inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group			       2003					 ISNAN(P)
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