73 lines
1.6 KiB
Plaintext
73 lines
1.6 KiB
Plaintext
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:- object(fault,
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imports(proto_hierarchy)).
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:- info([
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authors is 'Paulo Moura',
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version is 1.0,
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date is 2000/4/22,
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comment is 'Expert system for automobile fault diagnosis.',
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source is 'Example adopted from the LPA Prolog++ documentation.']).
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:- public(findall/0).
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:- mode(findall, one).
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:- private(told_by_user_/2).
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:- dynamic(told_by_user_/2).
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:- mode(told_by_user_(?nonvar, ?nonvar), zero_or_more).
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:- public(find/1).
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:- mode(find(?nonvar), zero_or_more).
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:- private(exhibited/1).
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:- mode(exhibited(+nonvar), zero_or_one).
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:- public(contrary/2).
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:- mode(contrary(?nonvar, ?nonvar), zero_or_more).
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:- public(fault/2).
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:- mode(fault(?nonvar, ?nonvar), zero_or_more).
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:- public(effect/2).
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:- mode(effect(?nonvar, ?nonvar), zero_or_more).
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:- public(symptom/2).
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:- mode(symptom(?nonvar, ?nonvar), zero_or_more).
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findall :-
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retractall(told_by_user_(_, _)),
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write('Please answer all questions with yes or no.'), nl, nl,
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forall(
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(::descendant(Where), Where::find(Description)),
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(nl, write('Location : '), write(Where), nl,
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write('Possible Fault: '), write(Description), nl)),
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nl, write('No (more) explanations found.').
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find(Description) :-
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::fault(Fault, Description),
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forall(::effect(Fault, Symptom), exhibited(Symptom)).
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exhibited(Symptom) :-
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told_by_user_(Symptom, Reply),
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!,
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Reply = yes.
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exhibited(Symptom) :-
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::symptom(Symptom, Description),
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write(Description), write('? '),
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read(Reply),
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asserta(told_by_user_(Symptom, Reply)),
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Reply = yes,
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forall(
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(::contrary(Symptom, Contrary);
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::contrary(Contrary, Symptom)),
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asserta(told_by_user_(Contrary, no))).
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:- end_object.
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