Prolog Quick question.

[snaps11]

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).

 

[joel76]

Did you test it on a list ?

 

[kamileo]

It returns the N-element of the list.