#include <iostream>
using namespace std;
class Ratio {
    public:
        int n,d;
        Ratio add(Ratio x){
            Ratio result;
            result.n=(n*x.d+x.n*d);
            result.d=(d*x.d);
            return result;
        }
        Ratio mul(Ratio x){
        }
        Ratio div(Ratio x){
        }
        Ratio subs(Ratio x){
        }
        bool equals(Ratio x){

        }


};
Ratio a, b,c;
int main(void){
    a.n=2;
    a.d=4;
    b.n=1;
    b.d=2;
    c=a.add(b);
    cout<<c.n<<"/"<<c.d<<endl;
    system("pause");
    return 0;
}