Strange: listing of Character values instead of the characters themselves

[Peter Karlsson]

Hello,

I have a short program doing permutations of a list of strings,
and it works ok in Strawberry Prolog.

But for some reason the gnu prolog lists all the character values in a name or
whatever you want to permute. Instead of the Strings themelves.

Of course I could convert that in some way, but I wonder why they
behave differently?

Best Regards,

/Peter Karlsson, Sweden

--------------------------------------------------------------------

%
% 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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Peter Karlsson / address@hidden / Täby, Sweden