Problem B: Person类与Student类的关系

Problem B: Person类与Student类的关系

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。

#include <iostream>
#include <string>

using namespace std;

class Person {
private:
    string name;
    int age;
public:
    Person(string s, int a) : name(s), 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;
    }
    void show() {
        cout << "Name is " << name << " and age is " << age << "." << endl;
    }
};

class Student : public Person {
private:
    int grade;
public:
    Student(string s, int a, int g) : Person(s, 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() {
        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;
}