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Revision 4482, 0.8 KB
(checked in by pmoura, 7 weeks ago)
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Modified the implementation of the predicate product/2 in the library object "numberlist" to fail for empty lists.
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Author Date Id Revision
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| 2 | :- protocol(numberlistp). |
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| 3 | |
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| 4 | :- info([ |
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| 5 | version is 1.2, |
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| 6 | author is 'Paulo Moura', |
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| 7 | date is 2008/9/15, |
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| 8 | comment is 'List of numbers protocol.']). |
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| 9 | |
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| 10 | :- public(product/2). |
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| 11 | :- mode(product(+list(number), ?number), zero_or_one). |
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| 12 | :- info(product/2, |
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| 13 | [comment is 'Calculates the product of all list numbers. Fails if the list is empty.', |
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| 14 | argnames is ['List', 'Product']]). |
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| 15 | |
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| 16 | :- public(sum/2). |
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| 17 | :- mode(sum(+list(number), ?number), one). |
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| 18 | :- info(sum/2, |
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| 19 | [comment is 'Calculates the sum of all list numbers. Returns zero if the list is empty.', |
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| 20 | argnames is ['List', 'Sum']]). |
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| 21 | |
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| 22 | :- public(average/2). |
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| 23 | :- mode(average(+list(number), ?float), zero_or_one). |
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| 24 | :- info(average/2, |
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| 25 | [comment is 'Calculates the average (i.e. arithmetic mean) of a list of numbers. Fails if the list is empty.', |
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| 26 | argnames is ['List', 'Average']]). |
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| 27 | |
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| 28 | :- end_protocol. |
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