#include<iostream> 
using namespace std; 
class Shape {
  public:
    virtual double volume() = 0;
};
class Cube : public Shape {
  private:
    int length; 
  public:
    Cube(int l) {
      length = l;
    }
    double volume() {
      return (length * length * length);
    }
};
class Cylinder : public Shape {
  private:
    double radius; 
    double height; 
  public:
    Cylinder(double r, double h) {
      radius = r;
      height = h;
    }
    double volume() {
      return (3.14 * radius * radius * height);
    }
};
class Box : public Shape {
  private:
    int length; 
    int breadth; 
    int height;
  public:
    Box(int l, int b, int h) {
      length = l;
      breadth = b;
      height = h;
    }
    double volume() {
      return (length * breadth * height);
    }
};

int main() 
{ 
  Shape *ptr;
  Cube c(9);
  Cylinder cy(10.2, 5.5);
  Box b(9, 4, 6);
  ptr = &c;
  cout << "Volume of Cube :" << ptr->volume() << endl;
  ptr = &cy;
  cout << "Volume of Cylinder :" << ptr->volume() << endl;
  ptr = &b;
  cout << "Volume of Box :" << ptr->volume() << endl;
  return 0;
}