为什么我们需要突破案例陈述？ [英] Why do we need break after case statements?

问题描述

为什么编译器不会在交换机中的每个代码块之后自动放置break语句？这是出于历史原因吗？您希望何时执行多个代码块？

Why doesn't the compiler automatically put break statements after each code block in the switch? Is it for historical reasons? When would you want multiple code blocks to execute?

推荐答案

有时将多个案例与相同的代码块相关联会很有帮助，例如

Sometimes it is helpful to have multiple cases associated with the same code block, such as

case 'A':
case 'B':
case 'C':
    doSomething();
    break;

case 'D':
case 'E':
    doSomethingElse();
    break;

等。只是一个例子。

根据我的经验，通常情况下，通过并且为一个案例执行多个代码块是不好的风格，但可能有用它在某些情况下。

In my experience, usually it is bad style to "fall through" and have multiple blocks of code execute for one case, but there may be uses for it in some situations.

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