C++ 菜鸟笔记-虚函数多态

#include <iostream>
using namespace std;
class baseNum {
public:
    virtual void one() { cout << "one" << endl; two(); }
    void two() { cout << "two" << endl; three(); }
    void three() { cout << "three" << endl; four(); }
    void four() { cout << "four" << endl; five(); }
    void five() { cout << "five" << endl; }
};
class chinaNum : public baseNum
{
public:
    void one() { cout << "一" << endl; two(); }
    void two() { cout << "二" << endl; three(); }
    void three() { cout << "三" << endl; four(); }
    void four() { cout << "四" << endl; five(); }
    void five() { cout << "五" << endl; }
};
class aliNum :public baseNum
{
public:
    void one() { cout << "1" << endl; two(); }
    void two() { cout << "2" << endl; three(); }
    void three() { cout << "3" << endl; four(); }
    void four() { cout << "4" << endl; five(); }
    void five() { cout << "5" << endl; }
};
int main()
{
    baseNum * num;
    int chonice;
    while (1)
    {
        bool falg = false;
        cout << "退出（0）英文（1）中文（2）阿拉伯数字（3）：";
        cin >> chonice;
        switch (chonice)
        {
        case 0 :
            falg = true;
            break;
        case 1:
            num = new baseNum;
            num->one();
            break;
        case 2:
            num = new chinaNum;
            num->one();
            break;
        case 3:
            num = new aliNum;
            num->one();
            break;
        default:
            cout << "选择不正确，请重新输入!" << endl;
            break;
        }

        if (falg) {
            break;
        }
    }
    return 0;
}