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Revision 365, 0.8 KB
(checked in by pmoura, 6 years ago)
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Changed "authors" key in info/1 directive to "author".
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Property svn:eol-style set to
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Property svn:keywords set to
Author Date Id Revision
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| 1 | |
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| 2 | :- object(integer, |
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| 3 | extends(number)). |
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| 4 | |
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| 5 | |
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| 6 | :- info([ |
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| 7 | version is 1.0, |
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| 8 | author is 'Paulo Moura', |
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| 9 | date is 2000/7/24, |
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| 10 | comment is 'Integer data type predicates.']). |
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| 11 | |
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| 12 | |
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| 13 | :- public(between/3). |
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| 14 | |
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| 15 | :- mode(between(+integer, +integer, ?integer), zero_or_more). |
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| 16 | |
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| 17 | :- info(between/3, [ |
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| 18 | comment is 'Returns integers in the interval defined by the two first arguments.', |
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| 19 | argnames is ['Lower', 'Upper', 'Integer']]). |
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| 20 | |
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| 21 | |
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| 22 | between(Lower, Upper, Integer) :- |
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| 23 | integer(Lower), |
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| 24 | integer(Upper), |
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| 25 | (var(Integer) -> |
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| 26 | Lower =< Upper, |
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| 27 | generate(Lower, Upper, Integer) |
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| 28 | ; |
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| 29 | integer(Integer), |
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| 30 | Lower =< Integer, |
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| 31 | Integer =< Upper). |
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| 32 | |
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| 33 | |
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| 34 | generate(Lower, _, Lower). |
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| 35 | |
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| 36 | generate(Lower, Upper, Integer) :- |
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| 37 | Lower < Upper, |
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| 38 | Next is Lower + 1, |
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| 39 | generate(Next, Upper, Integer). |
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| 40 | |
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| 41 | |
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| 42 | valid(Integer) :- |
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| 43 | integer(Integer). |
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| 44 | |
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| 45 | |
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| 46 | :- end_object. |
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