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ISLESSGREATER(3P)          POSIX Programmer's Manual         ISLESSGREATER(3P)

PROLOG
       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
       implementation of this interface may differ (consult the  corresponding
       Linux  manual page for details of Linux behavior), or the interface may
       not be implemented on Linux.
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  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(), 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 .

IEEE/The Open Group                  2003                    ISLESSGREATER(3P)