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December 1st, 2007, 08:01 AM

twilite kid

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Prolog Problem

Hey guys,

I'm teaching myself prolog and i'm having trouble solving a problem. The problem is this:

I want to write a predicate that deletes the first 2 and the last 2 elements of a list to create a new list. A sublist I suppose.

Any help appreciated.

Thanks!

December 1st, 2007, 08:35 AM

twilite kid

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I've got this so far. It's crude but it's an effort!!

delFirst2Last2([],[]).

delFirst2Last2([H1,H2,H3|T], [HNew|TNew]):-
H3 = HNew,
T = TNew.

Console:

| ?- delFirst2Last2([1,2,3,4,5,6], L2).

L2 = [3,4,5,6]

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