5.5

#include<iostream>

using namespace std;

#include<string>

class people {

public:

    void setValue(int m, string str) {

        age = m;

        name = str;

    }

    void display() {

        cout << "姓名:" << name << "年龄:" << age;

    }

protected:

    int age;

    string name;

};

class student :public people {

public:

    void setID(int m) {

        ID = m;

    }

    void displayID() {

        cout << "学号:" << ID << endl;

    }

private:

    int ID;

};

int main()

{

    student s;

    s.setValue(18, "小明");

    s.setID(10086);

    s.display();

    s.displayID();

    system("pause");

    return 0;

}