%query: in(i,o). %% in(Element, Tree) :- Element is an element of the search tree Tree. %% %TWTYPES :- type in(nat,treen). in(X, tree(X, _, _)). in(X, tree(Y, Left, _)) :- less(X,Y), in(X, Left). in(X, tree(Y, _, Right)) :- less(Y,X), in(X, Right). %TWTYPES :- type less(nat,nat). less(0, s(_)). less(s(X), s(Y)) :- less(X, Y). /*TWDESC in(Element, Tree) :- Element is an element of the search tree Tree. */ /*TWTYPES treen(void). treen(tree(V,L,R)) :- nat(V), treen(L), treen(R). nat(0). nat(s(X)) :- nat(X). */ /*TWDEMO selected_norms([nat,treen]). query(in(b,f,b,f)). query(in(b,f,f,b)). query(in(f,f,b,f)). query(less(b,f,f,f)). query(less(f,f,b,f)). */
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