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NAME
       isinf - test for infinity


SYNOPSIS
       #include <math.h>

       int isinf(real-floating x);


DESCRIPTION
       The  isinf()  macro  shall  determine  whether  its argument value is an infinity (positive or negative).
       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 isinf() macro shall return a non-zero value if and only if its argument has an infinite 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()  ,  isnan()  ,  isnormal()  ,  signbit()  ,  the  Base  Definitions volume of
       IEEE Std 1003.1-2001 <math.h>


       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 .