Student and Sports

#include <iostream>
using namespace std;
class student
{
  public:
  int roll_no,mark_1,mark_2;
  void get()
  {
    cin>>roll_no;
    cin>>mark_1;
    cin>>mark_2;
  }
};
class sports
{public:
 int sport_mark;
 void getsm()
 {
   cin>>sport_mark;
 }
};
class statement:public student,public sports
{
public:
int total,average;
void display()
{
total=mark_1+mark_2+sport_mark;
average=(mark_1+mark_2+sport_mark)/3;
cout<<roll_no<<endl;
cout<<total<<endl;
cout<<average;
}
};
int main()
{
  statement obj;
  obj.get();
  obj.getsm();
  obj.display();
  return 0;
}