====== List length 2 ======
{{tag>lists}}
===== Description =====
Determining the length of a list. 

**Source**:  The Art of Prolog
===== Download =====
Program source code: {{list_length_2.pl}}
===== Listing =====
<code prolog>
/*
	mylength(Xs,N) :- The list Xs has N elements.
*/

	mylength([],0).
	mylength([X|Xs],s(N)) :- mylength(Xs,N).

%	Program 3.17: Determining the length of a list
</code>
===== Comments =====