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Rashakil was correct that the rule matching a single number needs to come last. Here is a complete answer. Your first line also had to be changed: totalSum([],N) :- N is 0. totalSum([H|T],S):- totalSum(H,Sum1), totalSum(T,Sum2), S is Sum1+Sum2. totalSum(N,S):- S is N. and here are some examples of using it: …
The End.