55 lines
837 B
Plaintext
55 lines
837 B
Plaintext
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:- object(rectangle(_Width, _Height)).
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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 'Parametric object for representing geometric rectangles.',
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parnames is ['Width', 'Height']]).
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:- public(width/1).
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:- mode(width(?number), zero_or_one).
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:- info(width/1, [
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comment is 'Rectangle width.',
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argnames is ['Width']]).
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:- public(height/1).
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:- mode(height(?number), zero_or_one).
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:- info(height/1, [
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comment is 'Rectangle height.',
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argnames is ['Height']]).
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:- public(area/1).
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:- mode(area(-number), one).
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:- info(area/1, [
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comment is 'Rectangle area.',
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argnames is ['Area']]).
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width(Width) :-
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parameter(1, Width).
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height(Height) :-
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parameter(2, Height).
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area(Area) :-
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::width(Width),
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::height(Height),
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Area is Width*Height.
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:- end_object.
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