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nicholas wrote in message <7as4t8$cjs$1@mawar.singnet.com.sg>...
>Hello everyone, I urgently need help on prolog programming in my
coursework.
>Please help me if possible!!
>
>The question is as below:
>
>1. Define a predicate int that takes three lists as arguments and return
Yes
>if and only if the first two lists have the same length and the third list
>is the same as the first two interleaved.
>For example, int ([1,2], [4,5], [1,4,2,5]) should return Yes.
>

Just concentrate on satisfying the main interleaving. Don't bother about the
two lists having the same length as this will be an implicit understanding.
The terminating condition should be
xyz([],[],[]).

>2. Explain how the predicate int, defined above, could be used to define a
>predicate even that returns Yes if and only if its argument is a list with
>even length.
>

Just link the even part directly to xyz. The interleaved part will have to
be even, otherwise "no" will be displayed on your screen.

>Define even in this manner and explain why the following does not correctly
>define a predicate odd that returns Yes if and only if its argument is a
>list of odd length:
>
>odd(X) :- not even(X).
>

This is not a fair test as it will not force X to be a list. This has to be
done.

>How could this be changed to correct the deficiencies.
>
>Please help me and e-mail me the answer for the above two questions. Thank
>you in advanced.
>
>Best Regards,
>Nicholas


Enjoy...
-tryp