Prolog - 生成适合给定范围的数字 [英] Prolog - generating numbers fitting given range

问题描述

我想使用如下谓词:

range(X,0,5)
range(X,4,200)
range(X,-1000000,1000000)
dom_range(X,-1000000,1000000)

含义:

range(X,0,5) :- member(X,[0,1,2,3,4,5]).
range(X,4,200) :- member(X,[4,5,6...198,199,200]).
range(X,-1000000,1000000) :- member(X,[-1000000,...,1000000]).
dom_range(X,-1000000,1000000) :- domain(X, [-1000000,...,1000000]).

如何在 Prolog 中很好地编写代码(考虑解决方案性能 - 递归深度等)?

How to code it in Prolog nicely (taking solution performance into account - depth of recursion etc) ?

解决方案有望在 GNU-Prolog 上运行.

Solution is expected to run on GNU-Prolog.

附:受这个问题启发的问题.

推荐答案

SWI-Prolog 有谓词 介于/3.因此您可以将其称为 between(0,5,X) 以获得上面显示的结果.这个谓词看起来像是在 C 中实现的.

SWI-Prolog has the predicate between/3. so you would call it like between(0,5,X) to get the results you showed above. This predicate looks like this is implemented in C though.

如果我们必须用纯 prolog 编写它(速度和空间不是一个因素)，你可以试试下面这个.

If we have to write it in pure prolog (and speed&space is not a factor), you could try this following.

range(Low, Low, High).
range(Out,Low,High) :- NewLow is Low+1, range(Out, NewLow, High).

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