C++ Class_1.1

#include <iostream>
using namespace std;
class rec
      {
      int x,y;
      public:
             void set_values(int,int);
             int area(){return (x*y);}
      };
      void rec::set_values(int a, int b)
      {
           x=a;
           y=b;
      }
      int main()
      {
          rec rect;
          rect.set_values(3,4);
          cout << "area: "<< rect.area();
          system("pause");
          return 0;
      }

The Output is Given Below:

12