急需这题答案，只要这题答案，发其他参考的不需要，拿到答案立马采纳，真的急需

// ConsoleApplication5.cpp : 此文件包含 "main" 函数。程序执行将在此处开始并结束。
//
#include <iostream>

class Date {
public:
    int day;
    int month;
    int year;
public:
    void show();
    // Date():year(1900),month(1),day(1){}  
    Date() {};
    void init(int, int, int);
    // Date operator +(Date&);  
        // Date operator =(Date);  
    Date operator ++();
    Date operator ++(int);
};
//时间类  
class Time {
public:
    int Hour;
    int Minute;
    int Second;
    void show();
    Time() :Hour(12), Minute(0), Second(0) {}
    void init(int x, int y, int z);
    Time operator +(Time&);
    Time operator =(Time);
    Time operator ++();
};
void Date::init(int y, int m, int d) {
    this->year = (y > 1900 && y <= 2200) ? y : 1900;
    this->month = (m >= 1 && m <= 12) ? m : 1;
    this->day = (d >= 1 && d <= 31) ? d : 1;
}
void Time::init(int h, int m, int s) {
    this->Hour = (h >= 1 && h <= 24) ? h : 12;
    this->Minute = (m >= 0 && m <= 59) ? m : 0;
    this->Second = (s >= 0 && s <= 59) ? s : 0;
}
void Date::show() {
    std::cout << year << "年" << month << "月" << day << "日" << std::endl;
}
void Time::show() {
    std::cout << Hour << "时" << Minute << "分" << Second << "秒" << std::endl;
}

int main()
{
    Date data = Date();
    Time time = Time();
    while (true)
    {
        std::cout << "选择功能";
        std::cout << "1.初始化日期";
        std::cout << "2.显示日期";
        std::cout << "3.初始化时间";
        std::cout << "4.显示时间";
        int k;
        std::cin >> k;
        if (k == 1)
        {
            int year, month, day;
            std::cout << "输入年：";
            std::cin >> year;
            std::cout << "输入月：";
            std::cin >> month;
            std::cout << "输入日：";
            std::cin >> day;
            data.init(year, month, day);
        }
        else if (k == 2) {
            data.show();
        }
        else if (k == 3) {
            int hour, min, sec;
            std::cout << "输入时：";
            std::cin >> hour;
            std::cout << "输入分：";
            std::cin >> min;
            std::cout << "输入秒：";
            std::cin >> sec;
            time.init(hour, min, sec);
        }
        else if (k == 4)
        {
            time.show();
        }
        else
        {
        }
    }
    std::cout << "Hello World!\n";
}

代码如下，如有帮助，请立马采纳一下，谢谢。

//菜单类

class menu

{

public:

 menu(){}

 void login();

 void register();

 void exit();

 void run();

};

void menu::run()

{

 int choic = 0;

 int size = sizeof(fm)/sizeof(fm[0]); // 计算功能数组好一共有多少个功能

 while(1)

 {

  cin>>choice;

  getchar();

  for (int i = 0; i<size;i++)

  {

   if (choice == fm[i].choice)

   {

    (this->*fm[i].pf())();

   }

  }

 }

}

void menu::run()

{

 int choic = 0;

 int size = sizeof(fm)/sizeof(fm[0]); // 计算功能数组好一共有多少个功能

 while(1)

 {

  cin>>choice;

  getchar();

  for (int i = 0; i<size;i++)

  {

   if (choice == fm[i].choice)

   {

    (this->*fm[i].pf())();

   }

  }

 }

}