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pl:prolog:pllib:relationships [2019/06/27 15:50] (aktualna) |
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| + | ====== Relationships ====== | ||
| + | {{tag>family}} | ||
| + | ===== Description ===== | ||
| + | Defining family relationships. | ||
| + | |||
| + | **Source**: The Art of Prolog | ||
| + | |||
| + | ===== Download ===== | ||
| + | Program source code: {{relationships.pl}} | ||
| + | |||
| + | |||
| + | ===== Listing ===== | ||
| + | <code prolog> | ||
| + | uncle(Uncle,Person) :- | ||
| + | |||
| + | brother(Uncle,Parent), parent(Parent,Person). | ||
| + | |||
| + | |||
| + | |||
| + | sibling(Sib1,Sib2) :- | ||
| + | |||
| + | parent(Parent,Sib1), parent(Parent,SIb2), Sib1 \= Sib2. | ||
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| + | |||
| + | |||
| + | cousin(Cousin1,Cousin2) :- | ||
| + | |||
| + | parent(Parent1,Cousin1), | ||
| + | |||
| + | parent(Parent2,Cousin2), | ||
| + | |||
| + | sibling(Parent1,Parent2). | ||
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| + | |||
| + | |||
| + | %Program 2.1: Defining family relationships | ||
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| + | |||
| + | |||
| + | </code> | ||
| + | ===== Comments ===== | ||
| + | Luck of definition of brother in family2 | ||
