C++实验---Person类与Student类的关系

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：

数据成员string name和int age，分别表示姓名和年龄。

构造函数和析构函数，它们有相应的输出，见样例。

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：

数据成员int grade，表示学生所在年级。

构造函数和析构函数，它们有相应的输出，见样例。

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.

题目给定代码

int main()
{
    
    
    string n;
    int a, g;
    cin>>n>>a>>g;
    Student student(n, a, g);
    student.Person::show();
    student.show();
    return 0;
}

code:

#include<iostream>

using namespace std;

class Person{
    
    
protected:
	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;
	} 
	
	virtual ~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{
    
    
	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(){
    
    
		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;
}