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Revision 2, 353 bytes
(checked in by pmoura, 7 years ago)
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Initial revision
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| 1 | |
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| 2 | :- object(natural, |
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| 3 | extends(integer)). |
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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 | authors is 'Paulo Moura', |
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| 9 | date is 2000/7/24, |
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| 10 | comment is 'Natural numbers data type predicates.']). |
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| 11 | |
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| 12 | |
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| 13 | between(Lower, Upper, Integer) :- |
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| 14 | integer(Lower), |
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| 15 | Lower > 0, |
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| 16 | ^^between(Lower, Upper, Integer). |
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| 17 | |
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| 18 | |
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| 19 | valid(Natural) :- |
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| 20 | integer(Natural), |
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| 21 | Natural > 0. |
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| 22 | |
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| 23 | |
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| 24 | :- end_object. |
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