NAME

       isfinite - test for finite value

SYNOPSIS

       #include <math.h>

       int isfinite(real-floating x);

DESCRIPTION

       The  isfinite()  macro  shall  determine  whether  its  argument has a finite value (zero,
       subnormal, or normal, and not infinite or 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 isfinite() macro shall return a non-zero value if and  only  if  its  argument  has  a
       finite value.

ERRORS

       No errors are defined.

       The following sections are informative.

EXAMPLES

       None.

APPLICATION USAGE

       None.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       fpclassify() , 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 .