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Logtalk - Open source object-oriented logic programming language
Release 2.30.7
Copyright (c) 1998-2007 Paulo Moura. All Rights Reserved.
% start by loading the example:
| ?- logtalk_load(proxies(loader)).
...
% print the area and the perimeter for all circle proxies:
| ?- forall(circle(Id, R, C), (write(Id), write(' '), circle(R, C)::print)).
#1 area: 4.75291, perimeter: 7.72831, color: blue
#2 area: 43.2412, perimeter: 23.3106, color: yellow
#3 area: 0.477836, perimeter: 2.45044, color: green
#4 area: 103.508, perimeter: 36.0655, color: black
#5 area: 217.468, perimeter: 52.2761, color: cyan
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