Student, teaching and non-teaching staff from person

Design: a base class Person holds common data (name, age, address). Three classes derive from it publicly: Student (roll number, programme), TeachingStaff (department, subject) and NonTeachingStaff (department, post). Each class has getdata() and display().

#include <iostream>
#include <string>
using namespace std;

class Person {
protected:
    string name, address;
    int age;
public:
    void getPerson() {
        cout << "Name: ";    cin >> name;
        cout << "Age: ";     cin >> age;
        cout << "Address: "; cin >> address;
    }
    void showPerson() {
        cout << "Name: " << name << ", Age: " << age
             << ", Address: " << address << endl;
    }
};

class Student : public Person {
    int roll;
    string program;
public:
    void getdata() {
        getPerson();
        cout << "Roll no: ";   cin >> roll;
        cout << "Programme: "; cin >> program;
    }
    void display() {
        cout << "--- Student ---" << endl;
        showPerson();
        cout << "Roll: " << roll << ", Programme: " << program << endl;
    }
};

class TeachingStaff : public Person {
    string department, subject;
public:
    void getdata() {
        getPerson();
        cout << "Department: "; cin >> department;
        cout << "Subject: ";    cin >> subject;
    }
    void display() {
        cout << "--- Teaching Staff ---" << endl;
        showPerson();
        cout << "Dept: " << department << ", Subject: " << subject << endl;
    }
};

class NonTeachingStaff : public Person {
    string department, post;
public:
    void getdata() {
        getPerson();
        cout << "Department: "; cin >> department;
        cout << "Post: ";       cin >> post;
    }
    void display() {
        cout << "--- Non-teaching Staff ---" << endl;
        showPerson();
        cout << "Dept: " << department << ", Post: " << post << endl;
    }
};

int main() {
    Student s;
    TeachingStaff t;
    NonTeachingStaff n;

    cout << "Enter student details" << endl;           s.getdata();
    cout << "Enter teaching staff details" << endl;    t.getdata();
    cout << "Enter non-teaching staff details" << endl; n.getdata();

    s.display();
    t.display();
    n.display();
    return 0;
}

This is hierarchical inheritance: one base class (Person) with three derived classes. The common data is written once in Person and reused, which shows the reusability benefit of inheritance. Members are protected so derived classes can access them but outside code cannot.