Class.cpp

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

class Student
{
private :
    int age, standard;
    string first_name,last_name;

public :
    void set_age(int Age)
    {
        age = Age;
    }

    void set_first_name(string First_name)
    {
        first_name = First_name;
    }

    void set_last_name(string Last_name)
    {
        last_name = Last_name;
    }

    void set_standard(int Standard)
    {
        standard = Standard;
    }

    int get_age()
    {
        return age;
    }

    string get_first_name()
    {
        return first_name;
    }

    string get_last_name()
    {
        return last_name;
    }

    int get_standard()
    {
        return standard;
    }

    string to_string()
    {
        stringstream s;

        s << age << "," << first_name << "," << last_name << "," << standard;

        return s.str();
    }
};

int main()
{
    int age,standard;
    string first_name,last_name;

    cin >> age >> first_name >> last_name >> standard;

    Student st;

    st.set_age(age);
    st.set_first_name(first_name);
    st.set_last_name(last_name);
    st.set_standard(standard);

    cout << st.get_age() << "\n";
    cout << st.get_last_name() << ", " << st.get_first_name() << "\n";
    cout << st.get_standard() << "\n\n";

    cout << st.to_string();

    return 0;
}