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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 dif-
       fer (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, infinite, 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 classification 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  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                       FPCLASSIFY(3P)