isfinite(3p) - phpMan

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

PROLOG
       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
       implementation of this interface may differ (consult the  corresponding
       Linux  manual page for details of Linux behavior), or the interface may
       not be implemented on Linux.
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  con-
       verted 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 Defini-
       tions 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                         ISFINITE(3P)