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Prolog Quick question.

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snaps11

snaps11

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Prolog quick question

Explain what the following Prolog code does. Assume the third parameter is the result.

a( 1, [Hd | _Tl], Hd ).
a( N, [_ | Tl], Elem ) :-
N > 1,
N1 is N - 1,
a( N1, Tl, Elem).
 
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Did you test it on a list ?
 
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It returns the N-element of the list.
 
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