1ISGREATER(3P)              POSIX Programmer's Manual             ISGREATER(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

13       isgreater — test if x greater than y
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SYNOPSIS

16       #include <math.h>
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18       int isgreater(real-floating x, real-floating y);
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DESCRIPTION

21       The functionality described on this reference page is aligned with  the
22       ISO C  standard.  Any  conflict between the requirements described here
23       and the ISO C standard is unintentional. This  volume  of  POSIX.1‐2008
24       defers to the ISO C standard.
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26       The  isgreater()  macro  shall  determine whether its first argument is
27       greater than its second argument. The value of isgreater(x, y) shall be
28       equal  to  (x) > (y);  however, unlike (x) > (y), isgreater(x, y) shall
29       not raise the  invalid  floating-point  exception  when  x  and  y  are
30       unordered.
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RETURN VALUE

33       Upon  successful  completion,  the  isgreater()  macro shall return the
34       value of (x) > (y).
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36       If x or y is NaN, 0 shall be returned.
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ERRORS

39       No errors are defined.
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41       The following sections are informative.
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EXAMPLES

44       None.
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APPLICATION USAGE

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

60       None.
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FUTURE DIRECTIONS

63       None.
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SEE ALSO

66       isgreaterequal(),     isless(),     islessequal(),     islessgreater(),
67       isunordered()
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69       The Base Definitions volume of POSIX.1‐2008, <math.h>
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72       Portions  of  this text are reprinted and reproduced in electronic form
73       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
74       --  Portable  Operating  System  Interface (POSIX), The Open Group Base
75       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
76       cal  and  Electronics  Engineers,  Inc  and  The  Open Group.  (This is
77       POSIX.1-2008 with the 2013 Technical Corrigendum  1  applied.)  In  the
78       event of any discrepancy between this version and the original IEEE and
79       The Open Group Standard, the original IEEE and The Open Group  Standard
80       is  the  referee document. The original Standard can be obtained online
81       at http://www.unix.org/online.html .
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83       Any typographical or formatting errors that appear  in  this  page  are
84       most likely to have been introduced during the conversion of the source
85       files to man page format. To report such errors,  see  https://www.ker‐
86       nel.org/doc/man-pages/reporting_bugs.html .
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90IEEE/The Open Group                  2013                        ISGREATER(3P)
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