C++ design human and student class

Design a class people with protected data members: age (age, integer), name (name, string), behavior members: two constructors (one has no parameters, the other has parameters); destructor; void setValue( int m, string str) assigns values ​​to age and name; void display() outputs age and name.

Design a student class student, a public inheritance class people, with private members: ID (student number, integer), behavior members: two constructors (one without parameters, the other with parameters); destructor; void setID(int m) Assign a value to the ID; void displayID() outputs the ID.

Define the student object in the main function, assign values ​​to the object initialization or call setValue() and setID() to assign values, and output student information.

#include<iostream>
using namespace std;
//定义类
class People{
    protected:
        int age;//age(年龄,整型)
        string name;//name(姓名，string)
    public:
        People(){};//默认构造函数
        People(int a,string n){//有参数的构造函数
            age = a;
            name = n;
        }
        ~ People(){};//析构函数
        void setValue(int m,string str){
            age = m;
            name = str;
        }
        virtual void display() const = 0;//纯虚函数
};
class Student : public People{//Student类公有继承People类
    private:
        int studentID;//studentID(学号,整型)
    public:
        Student(){};//默认构造
        Student(int age,string name,int studentID):People(age,name){//含参构造
            this->studentID = studentID;
        }
        ~Student(){};//析构
        void setID(int m){//给studentID赋值
            this->studentID = m;
        }
        void display() const{//覆盖基类的虚函数，输出学生的姓名、年龄、学号
            cout<<name<<","<<age<<","<<studentID<<endl;
        }
};

void fun(People *ptr){//定义抽象类的指针和引用
    ptr->display();
}

int main(){
    //定义对象
    People *people;
    Student student;

    int age;
    string name;
    int id;
    cout<<"请输入年龄、姓名"<<endl;
    cin>>age>>name;
    people = &student;
    people->setValue(age,name);
    cout<<"请输入学生学号"<<endl;
    cin>>id;
    student.setID(id);
    cout<<"输出信息："<<endl;
    fun(&student);
    return 0;
}