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

{ vector <person *> A;
  A.push_back(new person("Lavinia", "Leopard", "55 Frog St.", "4046662233")):
  A.push_back(new person("Jim", "James", "987 Horse Rd.", "7364536475")):
  A.push_back(new person("Joe", "Jones", "123 Cat St.", "3051112222")):
  A.push_back(new person("Jemimah", "Jones", "123 Cat St.", "3051112222")):
  A.push_back(new person("Jimmy", "Jones", "123 Cat St.", "3051234321")):
  A.push_back(new person("Jilly", "Jones", "123 Cat St.", "3053242315")):
  A.push_back(new person("Anathema", "Hamsoup", "234 Dog Av.", "3057651243")):
  A.push_back(new employee("Colin", "Nostril", "234 Dog Av.", "9765432124", "34500", "manager")):
  A.push_back(new employee("Evangelina", "Smith", "17 Ant St.", "7253981256", "64250", "designer")):
  A.push_back(new employee("Lumpy", "Morris", "550 Bee St.", "7352749812", "52000", "secretary")):
  A.push_back(new employee("Ravioli", "Johnson", "99 Bat St.", "6364858272", "57500", "typist")):
  A.push_back(new criminal("Knuckles", "Badman", "77 Dark Lane", "9875674532", "burglary")):
  A.push_back(new criminal("Basher", "McRough", "245 Dog St.", "8272636451", "assault")):
  A.push_back(new criminal("Murgatroyd", "Madd", "591 Eel Way", "3547852371", "murder")):
  A.push_back(new banker("Arthur", "Arthropod-Smythe", "3 Rich Road", "1426378491", "57000000")):
  A.push_back(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[3]'s position is " << e->position << "\n";

  That mistake causes a run-time error

4)
  employee * e = (employee *) A[15];
  cout << "A[15]'s position is " << e->position << "\n";

  Even worse - an undetected wrong answer

5)
  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.