Everything the same as before, now we'll try using all that data.

{ person * A[16];
  A[0] = new person("Lavinia", "Leopard", "55 Frog St.", "4046662233");
  A[1] = new person("Jim", "James", "987 Horse Rd.", "7364536475");
  A[2] = new person("Joe", "Jones", "123 Cat St.", "3051112222");
  A[3] = new person("Jemimah", "Jones", "123 Cat St.", "3051112222");
  A[4] = new person("Jimmy", "Jones", "123 Cat St.", "3051234321");
  A[5] = new person("Jilly", "Jones", "123 Cat St.", "3053242315");
  A[6] = new person("Anathema", "Hamsoup", "234 Dog Av.", "3057651243");
  A[7] = new employee("Colin", "Nostril", "234 Dog Av.", "9765432124", "34500", "manager");
  A[8] = new employee("Evangelina", "Smith", "17 Ant St.", "7253981256", "64250", "designer");
  A[9] = new employee("Lumpy", "Morris", "550 Bee St.", "7352749812", "52000", "secretary");
  A[10] = new employee("Ravioli", "Johnson", "99 Bat St.", "6364858272", "57500", "typist");
  A[11] = new criminal("Knuckles", "Badman", "77 Dark Lane", "9875674532", "burglary");
  A[12] = new criminal("Basher", "McRough", "245 Dog St.", "8272636451", "assault");
  A[13] = new criminal("Murgatroyd", "Madd", "591 Eel Way", "3547852371", "murder");
  A[14] = new banker("Arthur", "Arthropod-Smythe", "3 Rich Road", "1426378491", "57000000");
  A[15] = new banker("Melinda", "Machiavelli", "1 1st St.", "9872436472", "72500000");

1)
  cout << "A[9]'s position is " << A[9]->position << "\n";

  fails because A[9] was declared as a pointer to a person, and persons do not have
  positions. The computer doesn't know what we actually stored there

2)
  employee * e = (employee *) A[9];
  cout << "A[9]'s position is " << e->position << "\n";

  A traditional typecast succeeds, but is dangerous

3)
  employee * e = (employee *) A[3];
  cout << "A[9]'s position is " << e->position << "\n";

  That mistake causes a run-time error

4)
  employee * e = dynamic_cast<employee *>(A[9]);
  if (e == NULL)
    cout << "A[9] is not an employee\n";
  else
    cout << "A[9]'s position is " << e->position << "\n";

  A dynamic cast actually checks that it is safe.