#include <iostream>
#include <string>

using namespace std;

class Shape {
  protected:
    string c; // color
    int w; // weight
  public:
    string getC() { return "white"; };
    virtual int getW() { return 0; }; // virtual function
    virtual int getV() = 0; // pure virtual function    /* problem 4-1 */
};

class Cube: public Shape {
  private:
    int s; // side
  public:
    Cube(string v1, int v2, int v3): s(v3) { setC(v1); setW(v2); };
    void setC(string v) { c = v; };
    void setW(int v) { w = v; };
    int getS() { return s; };
    string getC() { return c; };
    string getC(Cube *o) { return c + o->getC(); }; // function overloading
    virtual int getW() { return w; }
    virtual int getV() { return s * s * s; };
    Cube operator + (Cube& o) {  // operator overloading    /* problem 4-2 */
      return Cube(getC() + o.getC(), getW() + o.getW(), getS() + o.getS());
    }
};

int main() {
  Shape *p1 = new Cube("cyan", 1, 2);
  Cube *p2 = new Cube("blue", 3, 4);
  Cube cube = Cube("red", 5, 6) + *p2;
  cout << p1->getC() << endl;    /* problem 4-3: white */
  cout << p1->getW() << endl;    /* problem 4-4: 1 */
  cout << p2->getC() << endl;    /* problem 4-5: blue */
  cout << p2->getW() << endl;    /* problem 4-6: 3 */
  cout << cube.getC() << endl;    /* problem 4-7: redblue */
  cout << cube.getC(p2) << endl;    /* problem 4-8: redblueblue */
  cout << cube.getV() << endl;    /* problem 4-9: 1000 */
}