Class.cpp

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

class Student{
    private:
        int age, standard;
        std::string first_name, last_name;
    public:
        void set_age(int x){this->age = x;}
        void set_standard(int x){this->standard = x;}
        void set_first_name(std::string x){this->first_name = x;}
        void set_last_name(std::string x){this->last_name = x;}
    
        int get_age(){return age;}
        int get_standard(){return standard;}
        std::string get_first_name(){return first_name;}
        std::string get_last_name(){return last_name;}
        std::string to_string(){
            std::stringstream ss;
            ss << age << "," << first_name << "," << last_name << "," << 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;
}