Virtual Functions

class Person
{
    friend class Professor;
    friend class Student;
    string Name;
    int age;
    public:
    virtual void getdata() {;};
    virtual void putdata() {;};
};

class Professor : public Person
{
    
    static int all_id;
    int curr_id;
    int publications;
    public:
    Professor(){curr_id = all_id; ++all_id;};
    void getdata() override;
    void putdata() override;
};

class Student :  public Person
{
    
    static int all_id;
    int curr_id;
    vector <float> marks = vector<float>(6);
    float sum;
    public:
    Student(){curr_id = all_id; ++all_id;};
    void getdata() override;
    void putdata() override;
};

int Professor::all_id=1;
int Student::all_id=1;

void Professor::getdata()
{
    cin >> Name >> age >> publications;    
}

void Professor::putdata()
{
    cout << Name<<" " << age<<" " << publications <<" "<<curr_id<<endl;
}

void Student::getdata()
{
    cin >> Name >> age >> marks[0] >> marks[1]>> marks[2]>> marks[3]>> marks[4]>> marks[5];
    for (auto& n : marks)
    sum += n;
}

void Student::putdata()
{
    cout << Name<<" " << age<<" "<<sum<<" "<<curr_id<<" "<<endl;
}