递归循环中的值 [英] value in a recursive loop

问题描述

在递归循环中，我想更改变量的值：

In a recursive loop, I would like to change the value of a variable:

loop(N) when N > ... ->
N;
loop(N) ->
case ... of
  N+1
  ...
end,
...
case ... of
  N-1
  ...
end,
...
loop(N).

如何传递N的新值？

推荐答案

由于您无法更改 N 的值，因此您需要调用循环新值：

Since you can't change the value of N once assigned, you need to call loop with the new value:

loop(N) ->
    loop(N+1).

或者，创建一个临时变量来保存其新值，然后将其传递给递归循环调用。

Alternatively, create a temporary variable to hold its new value before passing it into the recursive loop invocation.

loop(N) ->
    NewN = N+1,
    loop(NewN).

如果这在代码中导致了很多重复，您可能需要将循环结构与产生新值N的逻辑：

If this results in a lot of repetition in your code, you might want to separate the looping construct from the logic which produces the new value of N:

loop(N) ->
    NewN = logic(N),
    loop(NewN).

logic(N) ->
    N+1.

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