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

NAME
       isunordered - test if arguments are unordered

SYNOPSIS
       #include <math.h>

       int isunordered(real-floating x, real-floating y);

DESCRIPTION
       The  isunordered()  macro  shall	 determine  whether  its arguments are
       unordered.

RETURN VALUE
       Upon successful completion, the isunordered() macro shall return	 1  if
       its arguments are unordered, and 0 otherwise.

       If x or y is NaN, 0 shall be returned.

ERRORS
       No errors are defined.

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       The  relational	and  equality operators support the usual mathematical
       relationships between numeric values. For any ordered pair  of  numeric
       values,	exactly one of the relationships (less, greater, and equal) is
       true. Relational operators may raise the invalid floating-point	excep‐
       tion  when  argument values are NaNs. For a NaN and a numeric value, or
       for two NaNs, just the unordered relationship is true. This macro is  a
       quiet  (non-floating-point  exception  raising) version of a relational
       operator. It facilitates writing efficient code that accounts for  NaNs
       without suffering the invalid floating-point exception. In the SYNOPSIS
       section, real-floating indicates that the argument shall be an  expres‐
       sion of real-floating type.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       isgreater()  ,  isgreaterequal()	 ,  isless() , islessequal() , isless‐
       greater()  ,  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 original Standard can be  obtained	online
       at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group		     2003			ISUNORDERED(P)
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