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Game

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Problem Solving

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Prolog program to find whether the length of a list is even or odd

 
domains
    x = integer
    l = integer*

predicates
    length(l,x)
    evenlength(l)
    oddlength(l)

clauses
    length([],0).

    length([X|List],Length) :-
        length(List,Length1),
        Length = Length1 + 1.

    evenlength(List) :-
        length(List,Length),
        Length mod 2 = 0.

    oddlength(List) :-
        length(List,Length),
        Length mod 2 <> 0.

Output :

For evenlength :

Goal: evenlength([1,2,3,4])
Yes

Goal: evenlength([1,2,3,4,5])
No

For oddlength :

Goal: oddlength([1,2,3,4,5])
Yes

Goal: oddlength([1,2,3,4])
No

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