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



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

NAME
       isgreater - test if x greater than y

SYNOPSIS
       #include <math.h>

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


DESCRIPTION
       The  isgreater()  macro  shall  determine  whether  its  first argument is greater than its second argument. The value of
       isgreater( x, y) shall be equal to (x) > (y); however, unlike (x) > (y), isgreater( x, y) shall  not  raise  the  invalid
       floating-point exception when x and y are unordered.

RETURN VALUE
       Upon successful completion, the isgreater() macro shall return the value of (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-float-
       ing type.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       isgreaterequal(),   isless(),   islessequal(),   islessgreater(),   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, Copy-
       right (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.open-
       group.org/unix/online.html .



IEEE/The Open Group                                           2003                                                 ISGREATER(3P)