#include<iostream>
using namespace std;

class Rational
{
      private:
          int top;
          int bot;
          int gcd(int x, int y) { return (x==0)? y : gcd(y%x, x); }
      public:
          Rational(int t = 0, int b = 1) 
             { int div = gcd(t,b );top = t/div, bot = b/div;}
          void print() {cout <<top<<"/"<<bot<<endl;}
          Rational add(Rational r);
          Rational mult(Rational r);
          bool equal(Rational r) { return ( top*r.bot == bot*r.top;}
};
Rational Rational::add (Rational r)
{
         int b = bot*r.bot;
         int t = top*r.bot+ bot*r.top;
         Rational res(t,b);
         return res;         
}          

int main()
{
    Rational r1(12,18), r2(4,16), r3(12, 45);
    Rational r = r2.add(r1);
    r = r.add(r3);
    r.print();
    system("pause");
    return 0;
}