1ISLESSGREATER(3P)          POSIX Programmer's Manual         ISLESSGREATER(3P)
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PROLOG

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

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

15       #include <math.h>
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17       int islessgreater(real-floating x, real-floating y);
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DESCRIPTION

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

28       Upon successful completion, the islessgreater() macro shall return  the
29       value of (x) < (y) || (x) > (y).
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31       If x or y is NaN, 0 shall be returned.
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ERRORS

34       No errors are defined.
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36       The following sections are informative.
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EXAMPLES

39       None.
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APPLICATION USAGE

42       The  relational  and  equality operators support the usual mathematical
43       relationships between numeric values. For any ordered pair  of  numeric
44       values,  exactly one of the relationships (less, greater, and equal) is
45       true. Relational operators may raise the invalid floating-point  excep‐
46       tion  when  argument values are NaNs. For a NaN and a numeric value, or
47       for two NaNs, just the unordered relationship is true. This macro is  a
48       quiet  (non-floating-point  exception  raising) version of a relational
49       operator. It facilitates writing efficient code that accounts for  NaNs
50       without suffering the invalid floating-point exception. In the SYNOPSIS
51       section, real-floating indicates that the argument shall be an  expres‐
52       sion of real-floating type.
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RATIONALE

55       None.
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FUTURE DIRECTIONS

58       None.
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SEE ALSO

61       isgreater(),  isgreaterequal(), isless(), islessequal(), isunordered(),
62       the Base Definitions volume of IEEE Std 1003.1-2001 <math.h>
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65       Portions of this text are reprinted and reproduced in  electronic  form
66       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
67       -- Portable Operating System Interface (POSIX),  The  Open  Group  Base
68       Specifications  Issue  6,  Copyright  (C) 2001-2003 by the Institute of
69       Electrical and Electronics Engineers, Inc and The Open  Group.  In  the
70       event of any discrepancy between this version and the original IEEE and
71       The Open Group Standard, the original IEEE and The Open Group  Standard
72       is  the  referee document. The original Standard can be obtained online
73       at http://www.opengroup.org/unix/online.html .
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77IEEE/The Open Group                  2003                    ISLESSGREATER(3P)
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