你如何有逻辑或万一的开关语句的一部分?

If you have a switch statement and want certain code to be run when the value is one value or another how do you do it? The following code always goes to the default case.

#include <iostream>
using namespace std;

int main()
{
    int x = 5;
    switch(x)
    {
        case 5 || 2:
            cout << "here I am" << endl;
            break;
        default:
            cout << "no go" << endl;
    }

    return 0;
}

推荐答案

像这样:

switch (x)
{
case 5:
case 2:
    cout << "here I am" << endl;
    break;
}

被称为跌倒".

只是指出在发布的代码中执行 default 案例的原因是 5 || 的结果2 是 1 (true).如果您在发布的代码中将 x 设置为 1，则 5 ||2 案例将被执行(参见 http://ideone.com/zOI8Z).