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Home/ Questions/Q 5937769
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Editorial Team
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Editorial Team
Asked: May 22, 20262026-05-22T15:35:21+00:00 2026-05-22T15:35:21+00:00

I am trying to solve some prolog exercises in order to learn the language

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I am trying to solve some prolog exercises in order to learn the language and i have problem adding the numbers in a prolog list.

For example i have the list [1,2,3] and i want to have as output number 6.

I wrote this code but it is not working.

list_adder([H|T],S):- S is H + T.

can anyone explain why?

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  1. Editorial Team
    Editorial Team
    2026-05-22T15:35:22+00:00Added an answer on May 22, 2026 at 3:35 pm

    try this:

    list_adder([ ],0).
    list_adder([X|L],Sum) :- list_adder(L,SL), Sum is X + SL.
    
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