（继承）Problem B: 一帮学生

Problem B: 一帮学生

Description

学生Student类是Person类的子类，而且每个人都有生日，生日是Date类的对象。所以，需要定义如下类：

1. Date类：拥有年、月、日三个int类型的属性。

2. Person类：有一个Date类型对象的属性（表示生日）、string类型属性（表示名字），以及一个int类型的静态属性numOfPersons（对象个数）。

3. Student类：是Person类的子类，并拥有一个int类型属性（表明学生学号），一个int类型的静态属性numOfStudents（对象个数）。
   定义上述类的构造、析构函数，并根据样例输出格式输出相应的信息。

Input

第一行整数N>0表示之后有N行输入。

之后的N行，每行包括4个整数、1个字符串，分别表示年、月、日、学号和姓名。

Output

见样例~

Sample Input

3
2010 3 4 1 Tom
2010 3 5 2 Jack
2010 3 6 3 Mary

Sample Output

Date 2010-3-4 is created.
The 1th person Tom whose birthday is 2010-3-4 is created.
The 1th student Tom whose birthday is 2010-3-4 and id is 1 is created.
Date 2010-3-5 is created.
The 2th person Jack whose birthday is 2010-3-5 is created.
The 2th student Jack whose birthday is 2010-3-5 and id is 2 is created.
Date 2010-3-6 is created.
The 3th person Mary whose birthday is 2010-3-6 is created.
The 3th student Mary whose birthday is 2010-3-6 and id is 3 is created.
Student Tom whose birthday is 2010-3-4 and id is 1 is erased.
Person Tom whose birthday is 2010-3-4 is erased.
Date 2010-3-4 is erased.
Student Jack whose birthday is 2010-3-5 and id is 2 is erased.
Person Jack whose birthday is 2010-3-5 is erased.
Date 2010-3-5 is erased.
Student Mary whose birthday is 2010-3-6 and id is 3 is erased.
Person Mary whose birthday is 2010-3-6 is erased.
Date 2010-3-6 is erased.

Append Code

int main()
{
    int year, month, day, id, i;
    string name;
    int num;
    cin>>num;
    Student **students = new Student*[num];
    for (i = 0; i < num; i++)
    {
        cin>>year>>month>>day>>id>>name;
        students[i] = new Student(year, month, day, name, id);
    }
    for (i = 0;i     return 0;
}

---

#include 
#include 
using namespace std;

class Date
{
public:
    int year_(){return year;}
    int month_(){return month;}
    int day_(){return day;}
public:
    Date(int y,int m,int d):year(y),month(m),day(d){cout<<"Date "<"-"<"-"<" is created."<"Date "<"-"<"-"<" is erased."<private:
    int year,month,day;
};

class Person
{
//public:
//    Date birth;
public:
    Person(int y,int m,int d,string n):birth(y,m,d),name(n){
        numOfPerson++;
        cout<<"The "<"th person "<" whose birthday is "<"-"<"-"<" is created."<"Person "<" whose birthday is "<"-"<"-"<" is erased."<public:
    string name_(){return name;}
    Date &birth_(){return birth;}//必须使用引用，原因可以进行样例测试可知
private:
    string name;
    Date birth;
    static int numOfPerson;
};

int Person::numOfPerson = 0;

class Student:public Person
{
public:
    Student(int y,int m,int d,string n,int id):Person(y,m,d,n)
    {
        stu=id;
    numOfStudent++;
    cout<<"The "<"th student "<" whose birthday is "<"-"<"-"<" and id is "<" is created."<"Student "<" whose birthday is "<"-"<"-"<" and id is "<" is erased."<private:
    int stu;
    static int numOfStudent;
};

int Student::numOfStudent = 0;

int main()
{
    int year, month, day, id, i;
    string name;
    int num;
    cin>>num;
    Student **students = new Student*[num];
    for (i = 0; i < num; i++)
    {
        cin>>year>>month>>day>>id>>name;
        students[i] = new Student(year, month, day, name, id);
    }
    for (i = 0;i return 0;
}