Overload the << Operator for an ostream

1. Define a friend function operator<<() for the CRational class, and another friend function operator<<() for the CMatrix class.
2. Define a friend function operator>>() for the CRational class, and another friend function operator>>() for the CMatrix class.
3. Now the previous main program

   
       cin >> n;
       CMatrix a(n,n), b(n,n), c(n,n);
       a.Read();
       b.Read();
       c = a + b;
       c.Print();
   
   

   can be simplified as

   
       cin >> n;
       CMatrix a(n,n), b(n,n), c(n,n);
       cin >> a >> b;
       c = a + b;
       cout << c;