NAME

       islessgreater - test if x is less than or greater than y

SYNOPSIS

       #include <math.h>

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

DESCRIPTION

       The  islessgreater()  macro  shall  determine  whether  its first argument is less than or
       greater than  its  second  argument.   The  islessgreater(  x,  y)  macro  is  similar  to
       (x) < (y) || (x) > (y);  however,  islessgreater(  x,  y)  shall  not  raise  the  invalid
       floating-point exception when x and y are unordered (nor shall it evaluate x and y twice).

RETURN VALUE

       Upon  successful  completion,  the  islessgreater()  macro  shall  return  the  value   of
       (x) < (y) || (x) > (y).

       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() , isunordered() , 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 .