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

12       isgreater — test if x greater than y
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SYNOPSIS

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

20       The functionality described on this reference page is aligned with  the
21       ISO C  standard.  Any  conflict between the requirements described here
22       and the ISO C standard is unintentional. This  volume  of  POSIX.1‐2017
23       defers to the ISO C standard.
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25       The  isgreater()  macro  shall  determine whether its first argument is
26       greater than its second argument. The value of isgreater(x, y) shall be
27       equal  to  (x) > (y);  however, unlike (x) > (y), isgreater(x, y) shall
28       not raise the  invalid  floating-point  exception  when  x  and  y  are
29       unordered.
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RETURN VALUE

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

38       No errors are defined.
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40       The following sections are informative.
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EXAMPLES

43       None.
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APPLICATION USAGE

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

59       None.
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FUTURE DIRECTIONS

62       None.
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SEE ALSO

65       isgreaterequal(),     isless(),     islessequal(),     islessgreater(),
66       isunordered()
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68       The Base Definitions volume of POSIX.1‐2017, <math.h>
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71       Portions  of  this text are reprinted and reproduced in electronic form
72       from IEEE Std 1003.1-2017, Standard for Information Technology --  Por‐
73       table  Operating System Interface (POSIX), The Open Group Base Specifi‐
74       cations Issue 7, 2018 Edition, Copyright (C) 2018 by the  Institute  of
75       Electrical  and  Electronics Engineers, Inc and The Open Group.  In the
76       event of any discrepancy between this version and the original IEEE and
77       The  Open Group Standard, the original IEEE and The Open Group Standard
78       is the referee document. The original Standard can be  obtained  online
79       at http://www.opengroup.org/unix/online.html .
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81       Any  typographical  or  formatting  errors that appear in this page are
82       most likely to have been introduced during the conversion of the source
83       files  to  man page format. To report such errors, see https://www.ker‐
84       nel.org/doc/man-pages/reporting_bugs.html .
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88IEEE/The Open Group                  2017                        ISGREATER(3P)
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