方案中的问题

发布于 2024-10-19 10:08:31 字数 358 浏览 3 评论 0原文

这是解决 Hanoy 塔问题的方案中的下一个程序有什么问题

(define tower_of_hanoi
  (lambda (move discs from to using)
    (if (> discs 0)
        ((tower_of_hanoi move (- discs 1) from using to)
        (tower_of_hanoi move (- discs 1) using to from)))))

(procedure application: expected procedure, given: #void; arguments were: #void)

谢谢大家。

原文

what is the problem this the next program in Scheme which solve the problem of Hanoy's tower

(define tower_of_hanoi
  (lambda (move discs from to using)
    (if (> discs 0)
        ((tower_of_hanoi move (- discs 1) from using to)
        (tower_of_hanoi move (- discs 1) using to from)))))

(procedure application: expected procedure, given: #void; arguments were: #void)

Thank u all.

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定格我的天空 2024-10-26 10:08:31

在您的代码中，您在 () 中调用了两个函数。当您使用它时，您的符号需要是一个函数/过程。所以你得到了错误。

检查下面的代码。我将其更改为 (和

(define tower_of_hanoi
  (lambda (move discs from to using)
    (if (> discs 0)
        (and (tower_of_hanoi move (- discs 1) from using to)
             (display move)(display " from ")(display from) (display " to ")(display to) (display "\n")
             (tower_of_hanoi move (- discs 1) using to from)))))

In your code you were calling two function calls in (). When you use that your symbol need to be a function/procedure. So you got the error.

Check the code below. I changed it to (and

(define tower_of_hanoi
  (lambda (move discs from to using)
    (if (> discs 0)
        (and (tower_of_hanoi move (- discs 1) from using to)
             (display move)(display " from ")(display from) (display " to ")(display to) (display "\n")
             (tower_of_hanoi move (- discs 1) using to from)))))

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