菜单中的 C++ 循环

Question

在我的代码中存在一个问题，即即使我输入“Q”或“q”，程序也会继续循环菜单。这里出了什么问题？这是代码:

{
    char selection;
    do {
        cout << "Add a county election file         A" << endl;
        cout << "Show election totals on screen     P" << endl;
        cout << "Search for county results          S" << endl;
        cout << "Exit the program                   Q" << endl;
        cout << "Please enter your choice: ";
        cin >> selection;
    } while ((selection != 'Q' || selection != 'q'));
    return 0;
}

Answer 1

您想在测试中使用 And (&&) 运算符，而不是 Or (||) 运算符。否则，selection != 'Q' 和 selection != 'q' 之一将始终为真，您的循环将永远不会退出。