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 .

IEEE/The Open Group                                   2003                                         FPCLASSIFY(P)