isunordered(3p) - phpMan

ISUNORDERED(P)                                                  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 exception 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 expression of real-floating type.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       isgreater() , isgreaterequal() , isless() , islessequal() , islessgreater()  ,  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 .



POSIX                                2003                       ISUNORDERED(P)

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