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Editorial Team
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Editorial Team
Asked: May 18, 20262026-05-18T06:23:46+00:00 2026-05-18T06:23:46+00:00

How can I double even numbers in a list in Prolog? For example: X=[1,2,3,5,4]

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How can I double even numbers in a list in Prolog?
For example:

X=[1,2,3,5,4]

The result should be:

X=[1,2,2,3,5,4,4]

Thank you!

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  1. Editorial Team
    Editorial Team
    2026-05-18T06:23:47+00:00Added an answer on May 18, 2026 at 6:23 am

    Even check can probably be done better, but it kinda works.

    even(N) :- 
        N mod 2 =:= 0.    
    
    doubleeven([],[]).
    doubleeven([H|T], [H,H|Z]) :-
        even(H),
        !,
        doubleeven(T,Z).
    doubleeven([H|T], [H|Z]) :-
        doubleeven(T,Z).
    
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