#include <iostream>
#include <string>

using namespace std;

class A{
    public: 
        A(string n): name(n){};
        virtual ~A() = default;

        virtual void Name(string n) {
           name = n;
        }
        virtual string Name() {
            return name;
        }
        virtual void ChangeName() = 0;
    private:
       string name; 
};

class B: public A {
    public:
      B(string n):A(n) {};
      void ChangeName() override {
           string data = Name();
           for(auto & x: data) {
               x = static_cast<char>(toupper(x));
           }
           Name( data);
      }
};

class C: public A {
    public:
      C(string n):A(n) {};
      void ChangeName() override {
           string data = Name();
           for(auto & x: data) {
               x = static_cast<char>(tolower(x));
           }
           Name(data);
      }
};

class D: public B, public C {
    public:
        D(string n): B(n), C(n) {};
        void ChangeName() override {
           // this will bomb
           //string data = Name();
           string data = "hello";

           for(size_t i=0; i< data.size(); i++) {
              if (i%2) {
                   data[i] = static_cast<char>(toupper(data[i]));
              } else {
                   data[i] = static_cast<char>(tolower(data[i]));
              }
           }
           // this will bomb
           // Name(data);
           
           cout << data << endl;
        }
};

int main() {
    B b("fred");
    C c("Bob");
    D d("DaVe");

    cout << b.Name() << endl;
    b.ChangeName();
    cout << b.Name() << endl;

    cout <<c.Name() << endl;
    c.ChangeName();
    cout << c.Name() << endl;

    cout << d.B::Name() << endl;
    cout << d.C::Name() << endl;
    d.B::ChangeName();
    d.C::ChangeName();
    cout << d.B::Name() << endl;
    cout << d.C::Name() << endl;
    d.ChangeName();
    // this will bomb
    //cout << d.Name() <<endl;

    return 0;
}