C++，C++求助，感谢

代码如下，如有帮助，请采纳一下，谢谢。

#include <iostream>
#include <string>
using namespace std;
class Student //
{
public:
	Student(int n,string nam)
	{
		num =n;
		name = nam;
	}
	void display()
	{
		cout << "num:" << num << endl;
		cout << "name"<< name << endl;
	}
protected:
	int num;
	string name;
};

class Student1:public Student
{
public:
	Student1(int n,string nam,int a):Student(n,nam)
	{
		age = a;
	}
	void show()
	{
		display();
		cout << "age:" << age << endl;
	}
private:
	int age;
};

class Student2:public Student1
{
public:
	Student2(int n,string nam,int a,int s):Student1(n,nam,a)
	{
		score = s;
	}
	void show_all()
	{
		show();
		cout << "score:" << score;
	}
private:
	int score;
};

int main()
{
	Student2 stud(10010,"Li",17,89);
	stud.show_all();
	return 0;
}

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