#include <iostream>

// This base class induces a memory leak
// in the derived class!
class Base{
public:
   Base() {}
   virtual ~Base() { std::cout << "In BASE destructor" << std::endl; }
};

class Derived : public Base {
public:
   Derived(int n = 2) : Base(), a(new int[n]) {}
   ~Derived() { 
      delete [] a; 
      std::cout << "In DERIVED destructor!\n"; 
    }
private:
   int *a;
};

main() {
   Base *D = new Derived(500);
   delete D;
   std::cout << "Program terminating" << std::endl;
}