fpclassify(3p) - phpMan

FPCLASSIFY(3P)             POSIX Programmer's Manual            FPCLASSIFY(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
       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,  infi-
       nite,  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 classifica-
       tion 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 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                       FPCLASSIFY(3P)