Hackerrank-C++-Class solution

 #include <iostream>

#include <sstream>
#include <string.h>
using namespace std;

class Student{
    public:
    int age;
    int standard;
    string first_name;
    string last_name;
    
    void set_age(int a)
    {
        age=a;
    }
    void set_standard(int s)
    {
        standard=s;
    }
    void set_first_name(string s1)
    {
        first_name=s1;
    }
    void set_last_name(string s2)
    {
        last_name=s2;
    }
    int get_age()
    {
        return age;
    }
    string get_last_name()
    {
        return last_name;
    }
    string get_first_name()
    {
        return first_name;
    }
    int get_standard()
    {
        return standard;
    }
    string to_string()
    {
        string data_1,data_2,data_3,data_4;
    
        stringstream ss1;
        ss1<<age;
        ss1>>data_1;
        
        data_2=first_name;
        data_3=last_name;
        
        stringstream ss2;
        ss2<<standard;
        ss2>>data_4;
        
        
        string data_5=data_1+","+data_2+","+data_3+","+data_4;
        return data_5;
    }
};
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;
}

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