trusty (3) signbit.3posix.gz

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NAME
       signbit - test sign


SYNOPSIS
       #include <math.h>

       int signbit(real-floating x);


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


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


ERRORS
       No errors are defined.

       The following sections are informative.


EXAMPLES
       None.


APPLICATION USAGE
       None.


RATIONALE
       None.


FUTURE DIRECTIONS
       None.


SEE ALSO
       fpclassify()  ,  isfinite()  ,  isinf()  ,  isnan()  ,  isnormal()  ,  the  Base  Definitions  volume  of
       IEEE Std 1003.1-2001, <math.h>


       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition,
       Standard  for  Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base
       Specifications 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 Standard, 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 .