在 switch 语句中使用 continue

2022-01-19 00:00:00 c break switch-statement c++ continue

我想从 switch 语句的中间跳转到下面代码中的循环语句:

I want to jump from the middle of a switch statement, to the loop statement in the following code:

while (something = get_something())
{
    switch (something)
    {
    case A:
    case B:
        break;
    default:
        // get another something and try again
        continue;
    }
    // do something for a handled something
    do_something();
}

这是使用 continue 的有效方式吗?switch 语句是否会忽略 continue 语句?C 和 C++ 在这里的行为是否有所不同?

Is this a valid way to use continue? Are continue statements ignored by switch statements? Do C and C++ differ on their behaviour here?

推荐答案

没关系，continue语句与封闭循环有关，你的代码应该相当于(避免这样的跳转语句):

It's fine, the continue statement relates to the enclosing loop, and your code should be equivalent to (avoiding such jump statements):

while (something = get_something()) {
    if (something == A || something == B)
        do_something();
}

但是，如果您希望 break 退出循环，正如您的评论所建议的那样(它总是用另一个东西再次尝试，直到它评估为 false)，您将需要一个不同的结构.

But if you expect break to exit the loop, as your comment suggest (it always tries again with another something, until it evaluates to false), you'll need a different structure.

例如:

do {
    something = get_something();
} while (!(something == A || something == B));
do_something();

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