Problem A: Person类与Student类的关系

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Problem A: Person类与Student类的关系
Time Limit: 1 Sec  Memory Limit: 128 MBSubmit: 2013  Solved: 1544[Submit][Status][Web Board]Description
当然，一个student首先是一个person。所以，Student类是Person类的派生类。请定义Person类，包括：
1. 数据成员string name和int age，分别表示姓名和年龄。
2. 构造函数和析构函数，它们有相应的输出，见样例。
3. void show()函数：按照样例输出该对象的name和age属性值。
定义Student类，是Person类的子类：
1. 数据成员int grade，表示学生所在年级。
2. 构造函数和析构函数，它们有相应的输出，见样例。
3. void show()函数：按照样例输出该对象的grade属性值。
Input
只有1行，分为三部分：一个不含空白符的字符串以及两个整数。
Output
见样例。
Sample Input
Tom 19 3
Sample Output
A person Tom whose age is 19 is created.A student whose grade is 3 is created.Name is Tom and age is 19.Grade is 3.A student whose grade is 3 is erased.A person Tom whose age is 19 is erased.
HINT
Append Code
append.cc, 
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#include <iostream>using namespace std;class Person{public:    string name;    int age;public:    Person(string n  ,int a  ) : name(n), age(a){ cout << "A person "  << name <<" whose age is " << age << " is created." << endl; }    ~Person() { cout << "A person "  << name << " whose age is " << age << " is erased." << endl; }public:    void show() const {    cout << "Name is " << name << " and age is " << age << "." << endl;    }};class Student : public Person{private:    int grade;public:    Student(string n, int a, int g) : Person(n, a), grade(g)    {        cout << "A student whose grade is " << grade << " is created." << endl;    }    ~Student()    {         cout << "A student whose grade is " << grade << " is erased." << endl;    }    void show()const    {        cout << "Grade is " << grade << "." << endl;    }};int main(){    string n;    int a, g;    cin>>n>>a>>g;    Student student(n, a, g);    student.Person::show();    student.show();    return 0;}
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