basic class

#include <iostream>
using namespace std;

class Age    {
    private :
         int size;
         int year;
    public :
        void SetSize(int aSize)   {     size = aSize;       }
        int  GetSize()            {   return   size ;       }
        void SetYear(int aYear)   {     year = aYear;       }
        int  GetYear()            {   return   year ;       }
        int  Area()               {  int res = size - year;
                                      return   res;
                                  }
};

int main()   {
    Age x;
    x.SetYear(2020);
    x.SetSize(5000);

    cout << "Year:" << x.GetYear() << ", Size:" << x.GetSize() << ", Area:" << x.Area() << endl;

    int z; cin >> z;
    return 0;
}