// B2.5.cpp : Defines the entry point for the console application.
//
// Given the classes:
//
// class A {
// public: 
//   virtual void fun1(int);
//   virtual int fun2(); 
//   void fun3();
// };
// class B : public A {
// public: 
//   void fun1(int); 
//   virtual void fun4();
// }
//
// show how you would call each of these five functions using
// a pointer of type A*.

#include "stdafx.h"
#include <iostream>
using namespace std;

// Given:

class A { 
public:
  A() :ival(0) {}
  virtual void fun1(int i) { cout << "\n  in A::fun1(" << i << ")"; ival = i; }
  virtual int fun2() { cout << "\n  in A::fun2()"; return ival;}
  void fun3() { cout << "\n  in A::fun3()"; }
  int& value() { return ival; }
private:
  int ival;
};

class B : public A {
public:
  void fun1(int i) { cout << "\n  in B::fun1(" << i << ")"; value()=i; }
  virtual void fun4() { cout << "\n  in B::fun4()"; }
};

// show how you invoke fun4 using a pointer of type A*.

int _tmain(int argc, _TCHAR* argv[])
{
  std::cout << "\n  Exam B2 - Question #5 "
            << "\n =======================\n";

  A a;
  A *pA = &a;
  pA->fun1(5);
  pA->fun2();
  pA->fun3();

  B b;
  pA = &b;
  pA->fun1(5);
  pA->fun2();
  pA->fun3();

//// answer //////////////////////
  dynamic_cast<B*>(pA)->fun4();
//////////////////////////////////

  cout << "\n\n";
  return 0;
}