Question

嘿，任何人都可以看到我的菜单在while循环中有什么问题，如果我在无限循环中按1，它会一直打印出dixie。我在菜单周围有一个循环循环，以便菜单始终在那里供用户返回选择。这是我的代码：

#include <iostream>
using namespace std;

int main()
{
    int choice;
    bool menu = true;
    cout <<"========Welcome to the database menu========\n";

    cout << "Press 1 to insert a new record at a particular position\n"
            "Press 2 to delete a record from a particular position\n"
            "Press 3 to search the database  and print results\n"
            "Press 5 to find the average experience points of players at a particular level\n"
            "Press 6 to find and remove all duplicate entries\n"
            "Press 0 to quit\n\n\n\n\n\n\n\n\n";

    cout << "Choice: ";
    cin >> choice;
    //*****************************************************************************
    // Switch menu to display the menu.
    //*****************************************************************************
    while(menu)
    {
        switch (choice)
        {
            case 1:
                cout << "dixie";
                break;
            case 2:
                cout << "bexie";
                break;
            default:
                cout<< "That is not a choice!!!\n";
        }
    }    
    getchar();
    getchar();
}

Answer 1

没有代码可以更改menu循环中的choice或while。所以一旦它开始，它将永远不会停止。

Answer 2

它说while (menu)，这意味着它会继续这样做，直到您将菜单设置为false。

另外，我想你想在循环中添加cin >> choice，或者只是反复重复选择。

Answer 3

我认为while循环应该包括打印菜单选项并让用户选择如下选项：

while (menu)
{
    cout <<"========Welcome to the database menu========\n";
    cout << "Press 1 to insert a new record at a particular position\n"
            "Press 2 to delete a record from a particular position\n"
            "Press 3 to search the database  and print results\n"
            "Press 5 to find the average experience points of players at a particular level\n"
            "Press 6 to find and remove all duplicate entries\n"
            "Press 0 to quit\n\n\n\n\n\n\n\n\n";

    cout<< "Choice: ";
    cin>> choice;

    switch (choice)
    {
        case 1:
            cout << "dixie";
            break;
        case 2:
            cout << "bexie";
            break;
        default:
            cout<< "That is not a choice!!!\n";
    }
}

另一种可能性是在cout << "Choice: "行之前启动while循环。

Answer 4

循环中

menu变量始终为true。它与目前的while(true)相同。

C ++菜单。菜单中无限循环

4 个答案: