NAME

       fpclassify - classify real floating type

SYNOPSIS

       #include <math.h>

       int fpclassify(real-floating x);

DESCRIPTION

       The  fpclassify()  macro  shall  classify  its  argument  value  as NaN, infinite, normal,
       subnormal, zero, or into  another  implementation-defined  category.  First,  an  argument
       represented  in  a  format wider than its semantic type is converted to its semantic type.
       Then classification is based on the type of the argument.

RETURN VALUE

       The fpclassify()  macro  shall  return  the  value  of  the  number  classification  macro
       appropriate to the value of its argument.

ERRORS

       No errors are defined.

       The following sections are informative.

EXAMPLES

       None.

APPLICATION USAGE

       None.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       isfinite()  ,  isinf() , isnan() , 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 .