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

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>

COPYRIGHT
       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 orig-
       inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group			       2003				       SIGNBIT(P)
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