1ISNORMAL(3P) POSIX Programmer's Manual ISNORMAL(3P)
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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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12 isnormal - test for a normal value
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15 #include <math.h>
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17 int isnormal(real-floating x);
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21 The isnormal() macro shall determine whether its argument value is nor‐
22 mal (neither zero, subnormal, infinite, nor NaN). First, an argument
23 represented in a format wider than its semantic type is converted to
24 its semantic type. Then determination is based on the type of the argu‐
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28 The isnormal() macro shall return a non-zero value if and only if its
29 argument has a normal value.
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32 No errors are defined.
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34 The following sections are informative.
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37 None.
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49 fpclassify(), isfinite(), isinf(), isnan(), signbit(), the Base Defini‐
50 tions volume of IEEE Std 1003.1-2001, <math.h>
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53 Portions of this text are reprinted and reproduced in electronic form
54 from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
55 -- Portable Operating System Interface (POSIX), The Open Group Base
56 Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
57 Electrical and Electronics Engineers, Inc and The Open Group. In the
58 event of any discrepancy between this version and the original IEEE and
59 The Open Group Standard, the original IEEE and The Open Group Standard
60 is the referee document. The original Standard can be obtained online
61 at http://www.opengroup.org/unix/online.html .
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65IEEE/The Open Group 2003 ISNORMAL(3P)