1FPCLASSIFY(3P)             POSIX Programmer's Manual            FPCLASSIFY(3P)
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PROLOG

6       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
7       implementation of this interface may differ (consult the  corresponding
8       Linux  manual page for details of Linux behavior), or the interface may
9       not be implemented on Linux.
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NAME

13       fpclassify — classify real floating type
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SYNOPSIS

16       #include <math.h>
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18       int fpclassify(real-floating x);
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DESCRIPTION

21       The functionality described on this reference page is aligned with  the
22       ISO C  standard.  Any  conflict between the requirements described here
23       and the ISO C standard is unintentional. This  volume  of  POSIX.1‐2008
24       defers to the ISO C standard.
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26       The  fpclassify() macro shall classify its argument value as NaN, infi‐
27       nite, normal, subnormal, zero, or into  another  implementation-defined
28       category.   First,  an  argument represented in a format wider than its
29       semantic type is converted to its semantic type. Then classification is
30       based on the type of the argument.
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RETURN VALUE

33       The fpclassify() macro shall return the value of the number classifica‐
34       tion macro appropriate to the value of its argument.
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ERRORS

37       No errors are defined.
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39       The following sections are informative.
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EXAMPLES

42       None.
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APPLICATION USAGE

45       None.
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RATIONALE

48       None.
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FUTURE DIRECTIONS

51       None.
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SEE ALSO

54       isfinite(), isinf(), isnan(), isnormal(), signbit()
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56       The Base Definitions volume of POSIX.1‐2008, <math.h>
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59       Portions of this text are reprinted and reproduced in  electronic  form
60       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
61       -- Portable Operating System Interface (POSIX),  The  Open  Group  Base
62       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
63       cal and Electronics Engineers,  Inc  and  The  Open  Group.   (This  is
64       POSIX.1-2008  with  the  2013  Technical Corrigendum 1 applied.) In the
65       event of any discrepancy between this version and the original IEEE and
66       The  Open Group Standard, the original IEEE and The Open Group Standard
67       is the referee document. The original Standard can be  obtained  online
68       at http://www.unix.org/online.html .
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70       Any  typographical  or  formatting  errors that appear in this page are
71       most likely to have been introduced during the conversion of the source
72       files  to  man page format. To report such errors, see https://www.ker‐
73       nel.org/doc/man-pages/reporting_bugs.html .
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77IEEE/The Open Group                  2013                       FPCLASSIFY(3P)
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