Ancestor

Description

The ancestor relationship.

Source: The Art of Prolog

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Program source code: ancestor.pl

Listing

/*
	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

Comments

pl/prolog/pllib/ancestor.txt · ostatnio zmienione: 2017/07/17 08:08 (edycja zewnętrzna)
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