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Logtalk - Object oriented extension to Prolog
Release 2.15.3

Copyright (c) 1998-2003 Paulo Moura.  All Rights Reserved.
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% DCG rules implementing a simple calculator:

| ?- calculator::parse("1+2-3*4", Result).

Result = -9
yes


% recognizing gramatically correct sentences

| ?- sentence::parse([the, girl, likes, the, boy], Result).

Result = true
yes

| ?- sentence::parse([the, girl, scares, the, boy], Result).

Result = false
yes


% generating parse trees for sentences

| ?- parsetree::parse([the, girl, likes, the, boy], Tree).

Tree = Tree = s(np(d(the), n(girl)), vp(v(likes), np(d(the), n(boy))))
yes