我如何声明两个列表的长度相同? [英] How do I state that two lists have the same length?

问题描述

我需要知道如何在 Prolog 中比较两个列表的长度.这是我目前所拥有的:

I need to know how to compare the length of two lists in Prolog. This is what I have so far:

sum(N1,N2) :-
    checklength(N1,N2).

checklength(N1,N2) :-
    L1 is length(N1,What),
    L2 is length(N2,What),
    Comp(L1,L2).

Comp(L1,L2) :-
    L1=:=L2.

推荐答案

当然，CapelliC 的答案是完美的，但您也可以尝试解决此问题的标准"方法:

Of course, the answer from CapelliC is perfect, but you can try also the "standard" method of approaching this problem:

same_length([],[]).
same_length([_|L1],[_|L2]) :- same_length(L1, L2).

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