#include <iostream.h>


class parent
{
public:

   int i1;

   void f1()
   {
      cout << "parent method" << endl;
   }
};

class child : public parent
{
public:
   int i2;

   void f2()
   {
      cout << "child method" << endl;
   }
};

int main(int argc, char **argv)
{
   parent x, *p;
   child *q;


   x.i1 = 1;

   p = &x;	      // p points to a parent variable (object)

   q = (child *) p;   // May cause problems - if you access child part !....
// q = (child *) &x;

   cout << "q->i1 = " << q->i1 << endl;   // OK
   cout << "q->i2 = " << q->i2 << endl;   // Access a non-existing variable !!
}