读取输入直到退出语句序言 [英] Read Input till quit statement prolog

问题描述

所以我正在编写一个聊天机器人，我需要不断地从用户那里获取输入，只要他们不输入退出".但如果他们这样做了，我必须对用户提出的问题进行一定的回顾和然后返回 true ，我在使用谓词时遇到问题，该谓词将继续读取输入直到输入退出，有人可以帮助我吗?谢谢

So I'm coding a chat Bot and I need to keep taking input from the user as long as they don't type 'quit.', but if they do I must do a certain recap of what the user asked and then return true , I'm having trouble with the predicate that will keep reading the input till quit is typed , Can anyone help me? Thanks

推荐答案

这个问题措辞比较笼统，所以这里描述了如何使它在 Prolog 半伪代码中工作:

The question is worded rather generally, so here's a description of how to make it work in Prolog semi-pseudo-code:

user_input :-
    repeat,
    read_a_line(Line),
    (   Line = quit  % You might have another way to check this depending...
    ->  write('Finished'), nl,
        !, true
    ;   do_something_with(Line),
        fail
    ).

repeat-fail 循环的工作方式是让您不想继续执行循环.然后为了退出循环，您希望通过剪切成功.

The way the repeat-fail loop works is that you want to fail to continue to do your loop. Then for exiting the loop, you want to succeed with a cut.

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