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pl:prolog:pllib:ancestor [2019/06/27 15:50] (aktualna) |
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| + | ====== Ancestor ====== | ||
| + | {{tag>family recursion}} | ||
| + | ===== Description ===== | ||
| + | The ancestor relationship. | ||
| + | |||
| + | **Source**: The Art of Prolog | ||
| + | ===== Download ===== | ||
| + | Program source code: {{ancestor.pl}} | ||
| + | ===== Listing ===== | ||
| + | <code prolog> | ||
| + | /* | ||
| + | ancestor(Ancestor,Descendant) :- | ||
| + | Ancestor is an ancestor of Descendant. | ||
| + | */ | ||
| + | ancestor(Ancestor,Descendant) :- | ||
| + | parent(Ancestor,Descendant). | ||
| + | ancestor(Ancestor,Descendant) :- | ||
| + | parent(Ancestor,Person), ancestor(Person,Descendant). | ||
| + | |||
| + | % Program 2.5: The ancestor relationship | ||
| + | </code> | ||
| + | ===== Comments ===== | ||
