Class.cpp

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

class Student {
    int age;
    string first_name;
    string last_name;
    int standard;

    public:
    void set_age(int age);
    void set_first_name(string fname);
    void set_last_name(string lname);
    void set_standard(int standard);

    int get_age();
    string get_first_name();
    string get_last_name();
    int get_standard();

    string to_string();

};

void Student :: set_age(int a) {
    age = a;
}

void Student :: set_first_name(string fname) {
    first_name = fname;
}

void Student :: set_last_name(string lname) {
    last_name = lname;
}

void Student :: set_standard(int s) {
    standard = s;
}

int Student :: get_age() {return age;}
string Student :: get_first_name() {return first_name;}
string Student :: get_last_name() { return last_name;}
int Student :: get_standard() {return standard;}

string Student :: to_string() {
    char ch = ',';
    stringstream ss;
    ss << age << ch << first_name << ch << last_name << ch << standard;
    return ss.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_standard(standard);
    st.set_first_name(first_name);
    st.set_last_name(last_name);
    
    cout << st.get_age() << "\n";
    cout << st.get_last_name() << ", " << st.get_first_name() << "\n";
    cout << st.get_standard() << "\n";
    cout << "\n";
    cout << st.to_string();
    
    return 0;
}