personStudentTeacher

#include <iostream>
using namespace std;

class Person{
    //...
    public:
        Person(){
            name = "noName";
        }
        Person(string n){
            name = n;
        }
    virtual void talk(){
        cout << "You shouldn't see this sentence.'" << endl;
    }
    protected:
        string name;
};
class Student : public Person{
    public:
        Student(){
        }
        Student(string n) : Person(n){
        }

    string getName(){
        return name;
    }

    void talk(){
        cout << "Studying sucks!" << endl;
    }

    //...
};

class Teacher : public Person{
    public:
        Teacher(){
            //name = "NoName_Student";
        }
        Teacher(string n) : Person(n){
        }
    void talk(){
        cout << "Studying makes your life better." << endl;
    }

};

int main() {
    Student s1("Sam"), s3("Jamie");
    Teacher t2("David"), t4("Tommmy");

// if you can know where I am; then, you can be me (pointer)
    Person *p[4] = {&s1, &t2, &s3, &t4};
    for (int i = 0 ; i < 4; i++){
        p[i]->talk();
    }
/*
    p[0]->talk();
    p[1]->talk();
    p[2]->talk();
    p[3]->talk();
*/
/*
    s1.talk();
    t2.talk();
    s3.talk();
    t4.talk();
*/

}