为什么不能和视频讲的一样?

#include <iostream>
using namespace std;
int main()
{
    bool quit=false;
    for (;;)//永久性循环
    {
        char choice;
        cout<<"(0)零(1)一(2)二(3)三(4)四(5)五(6)六(7)七(8)八(9)九(q)退出";
        cin>>choice;
        switch (choice)
        {
    case '0':cout<<"您输入的是零！\n";
        break;
    case '1':cout<<"您输入的是一！\n";
        break;
    case '2':cout<<"您输入的是二！\n";
        break;
    case '3':cout<<"您输入的是三！\n";
        break;
    case '4':cout<<"您输入的是四！\n";
        break;
    case '5':cout<<"您输入的是五！\n";
        break;
    case '6':cout<<"您输入的是六！\n";
        break;
    case '7':cout<<"您输入的是七！\n";
        break;
    case '8':cout<<"您输入的是八！\n";
        break;
    case '9':cout<<"您输入的是九！\n";
        break;
    case 'q':quit=true;
        break;
    default:cout<<"您输入的不是0到9之间的有效数字。\n";
    }
        if (quit=true)
        {
            break;
        }
    }
    cout<<"\n程序结束\n";
    return 0;
}