Hello,
In GNU-Prolog a string is a simple notation of a list of character codes
(as in most Prolog implementations).
You should use atoms instead of string. For instance replace your
example/1 fact by:
example(['Peter','Diva','Ex','Newt','Xtra']).
And everything is OK. Alternatively you can use format('~s',[ "my
string" ]) to display a string (but you have to do it for each element
of the list Perm).
Daniel
Le 24/01/2011 14:36, Peter Karlsson a écrit :
%
% Testing permute& select
%
test :- example(Ex), permutation(Ex, Perm),
write(Perm), nl, fail.
test :- true.
example(["Peter","Diva","Ex","Newt","Xtra"]).
% Permutation& Select
%permutation(Xs, [Z|Zs]) :- select(Z, Xs, Ys), %permutation(Ys, Zs).
%permutation([],[]).
%select(X, [X|Xs], Xs).
%select(X, [Y|Ys], [Y|Zs]) :- select(X, Ys, Zs).
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