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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 dif-
       fer (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. Rela-
       tional 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 indi-
       cates 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, Stan-
       dard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base  Specifica-
       tions  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 Stan-
       dard,  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)