Relational operator overloading .cpp

#include <bits/stdc++.h>
using namespace std;
class number{
   int x , y;
   public:
       number(){x = 0, y = 0;}
       void input(){ cin >> x >> y;}
       void set (int a , int b)
       {
           x = a , y = b;
       }
       bool operator > (number ob)
       {
           return x + y > ob.x + ob.y;
       }
       bool operator < (number ob)
       {
           return x +y < ob.x + ob.y;
       }
        bool operator == (number ob)
       {
           return (x +y) == (ob.x + ob.y);
       }

};
int main()
{
   number n1 ,n2 , n3;
   n1.input();
   n2.input();
   if(n1 > n2)
    printf("N1 is greater then N2\n");
   else if(n1 < n2)
    printf("N2 is greater then N1\n");
    else if(n1  == n2)
        printf("Twice are same\n");
}