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 (consult 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 functionality described on this reference page is aligned with the
       ISO C standard. Any conflict between the requirements described here
       and the ISO C standard is unintentional. This volume of POSIX.1-2017
       defers to the ISO C standard.

       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-floating type.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       isgreaterequal(), isless(), islessequal(), islessgreater(),
       isunordered()

       The Base Definitions volume of POSIX.1-2017, <math.h>

COPYRIGHT
       Portions of this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1-2017, Standard for Information Technology --
       Portable Operating System Interface (POSIX), The Open Group Base
       Specifications Issue 7, 2018 Edition, Copyright (C) 2018 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 .

       Any typographical or formatting errors that appear in this page are
       most likely to have been introduced during the conversion of the source
       files to man page format. To report such errors, see
       https://www.kernel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group                  2017                        ISGREATER(3P)