% ==========================================================================
% $Id: list_sum.pl,v 1.1 2014/01/21 04:50:36 jlang Exp $
% CSI2120 example Code for lecture 5
% ==========================================================================
% (C)opyright:
%
%   Jochen Lang
%   EECS, University of Ottawa
%   800 King Edward Ave.
%   Ottawa, On., K1N 6N5
%   Canada. 
%   http://www.eecs.uottawa.ca/~jlang
% 
% Creator: jlang (Jochen Lang) based on Clocksin & Mellish
% Email:   jlang@eecs.uottawa.ca
% ==========================================================================
% $Log: list_sum.pl,v $
% Revision 1.1  2014/01/21 04:50:36  jlang
% Added further list processing for lecture 5.
%
% ==========================================================================
sumList(L,S) :- sumList(L,0,S). % Helper list
sumList([],S,S). % boundary case
sumList([X|L],T,S) :- TT is T+X, 
	sumList(L,TT,S).