====== List sum 2 ======
{{tag>lists arithmetic}}
===== Description =====
Summing a list of integers

**Source**:  The Art of Prolog
===== Download =====
Program source code: {{list_sum_2.pl}}
===== Listing =====
<code prolog>
/*
   sumlist(Is,Sum) :- Sum is the sum of the list of integers Is.
*/
     sumlist([I|Is],Sum) :- sumlist(Is,IsSum), Sum is I+IsSum.
     sumlist([],0).

%  Program 8.6a   Summing a list of integers
</code>
===== Comments =====