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

6       signbit - test sign
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SYNOPSIS

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

15       The  signbit()  macro  shall determine whether the sign of its argument
16       value is negative. NaNs, zeros, and infinities have a sign bit.
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RETURN VALUE

19       The signbit() macro shall return a non-zero value if and  only  if  the
20       sign of its argument value is negative.
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ERRORS

23       No errors are defined.
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25       The following sections are informative.
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EXAMPLES

28       None.
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APPLICATION USAGE

31       None.
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RATIONALE

34       None.
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FUTURE DIRECTIONS

37       None.
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SEE ALSO

40       fpclassify()  ,  isfinite() , isinf() , isnan() , isnormal() , the Base
41       Definitions volume of IEEE Std 1003.1-2001, <math.h>
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44       Portions of this text are reprinted and reproduced in  electronic  form
45       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
46       -- Portable Operating System Interface (POSIX),  The  Open  Group  Base
47       Specifications  Issue  6,  Copyright  (C) 2001-2003 by the Institute of
48       Electrical and Electronics Engineers, Inc and The Open  Group.  In  the
49       event of any discrepancy between this version and the original IEEE and
50       The Open Group Standard, the original IEEE and The Open Group  Standard
51       is  the  referee document. The original Standard can be obtained online
52       at http://www.opengroup.org/unix/online.html .
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56IEEE/The Open Group                  2003                           SIGNBIT(P)
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