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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 =====
  
pl/prolog/pllib/ancestor.txt · ostatnio zmienione: 2019/06/27 15:50 (edycja zewnętrzna)
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