1FPCLASSIFY(P)              POSIX Programmer's Manual             FPCLASSIFY(P)
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NAME

6       fpclassify - classify real floating type
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SYNOPSIS

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

15       The  fpclassify() macro shall classify its argument value as NaN, infi‐
16       nite, normal, subnormal, zero, or into  another  implementation-defined
17       category.  First,  an  argument  represented in a format wider than its
18       semantic type is converted to its semantic type. Then classification is
19       based on the type of the argument.
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RETURN VALUE

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

26       No errors are defined.
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28       The following sections are informative.
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EXAMPLES

31       None.
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APPLICATION USAGE

34       None.
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RATIONALE

37       None.
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FUTURE DIRECTIONS

40       None.
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SEE ALSO

43       isfinite() , isinf() , isnan() , isnormal() , signbit() , the Base Def‐
44       initions volume of IEEE Std 1003.1-2001, <math.h>
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47       Portions  of  this text are reprinted and reproduced in electronic form
48       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
49       --  Portable  Operating  System  Interface (POSIX), The Open Group Base
50       Specifications Issue 6, Copyright (C) 2001-2003  by  the  Institute  of
51       Electrical  and  Electronics  Engineers, Inc and The Open Group. In the
52       event of any discrepancy between this version and the original IEEE and
53       The  Open Group Standard, the original IEEE and The Open Group Standard
54       is the referee document. The original Standard can be  obtained  online
55       at http://www.opengroup.org/unix/online.html .
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59IEEE/The Open Group                  2003                        FPCLASSIFY(P)
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