class.cpp

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

class Student
{
	private:
	int age,standard;
	string first_name,last_name;
	public:
	void set_age(int a)
	{ 
	  age = a;
    }
	int get_age()
	{
	return age;
	}
	void set_standard(int s)
	{
	standard=s;
    }
	int get_standard()
	{
	  return standard;	
	}
	void set_first_name(string f)
	{
	first_name = f; //String can be directly modified 	
	} 	
	string get_first_name()
	{
		return first_name; //Just returning the instance member variable type string
	}
	void set_last_name(string l)
	{
	last_name =""+ l; //Operations can be performed on this type unlike char array.	
	}
	string get_last_name()
	{
		return last_name;
	}
	string to_string()
	{
		stringstream obj;
		obj<<age<<","<<first_name<<","<<last_name<<","<<standard;
	    return obj.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;
}