3 Basic class program

#include <iostream>
using namespace std;
class student{
    int roll;
    public:
    void getdata() {
        cout<<"enter your roll no ";
        cin>>roll;
    }
    void display() {
        cout<<"roll no "<<roll;
    }
};
using namespace std;
int main()
{
    student s;
    s.getdata();
    s.display();
    return 0;
}
/*
Output
enter your roll no 5
roll no 5
*/