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ISINF(3P)                  POSIX Programmer's Manual                 ISINF(3P)



PROLOG
       This manual page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may dif-
       fer (consult the corresponding Linux manual page for details of Linux behavior), or the interface  may  not  be
       implemented on Linux.

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  determi-
       nation 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>

COPYRIGHT
       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Stan-
       dard  for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifica-
       tions 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 Stan-
       dard, 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                            ISINF(3P)