Присвоение производных классов в массив родительского класса

class Human {
 
private:
int number;
int age;
AnsiString name;
AnsiString surname;
 
public:
 
int get_number () {return(number);}
void set_number (int number_in) {number = number_in;}
 
int get_age () {return(age);}
void set_age (int age_in) {age = age_in;}
 
AnsiString get_name () {return(name);}
void set_name (string name_in) {name = name_in;}
 
AnsiString get_surname () {return(surname);}
void set_surname (string surname_in) {surname = surname_in;}
 
//------------------------------------------------------------------------------
 
Human();
Human(int Number, int Age, AnsiString Name, AnsiString Surname);
 
 
};
 
 
class Student : public Human{
 
private:
int group;
int course;
AnsiString specialization;
 
public:
 
int get_group () {return(group);}
void set_group (int group_in) {group = group_in;}
 
int get_course () {return(course);}
void set_course (int course_in) {course = course_in;}
 
AnsiString get_specialization () {return(specialization);}
void set_specialization (string specialization_in) {specialization = specialization_in;}
 
//------------------------------------------------------------------------------
 
Student();
 
Student(int Number, int Age, AnsiString Name, AnsiString Surname,
            int Group, int Course, AnsiString Specialization);
 
};
 
 
class Teacher : public Human{
 
private:
int experience;
AnsiString degree;
AnsiString subject;
 
public:
 
int get_experience () {return(experience);}
void set_experience (int experience_in) {experience = experience_in;}
 
AnsiString get_degree () {return(degree);}
void set_degree (string degree_in) {degree = degree_in;}
 
AnsiString get_subject () {return(subject);}
void set_subject (string subject_in) {subject = subject_in;}
 
//------------------------------------------------------------------------------
 
Teacher(int Number, int Age, AnsiString Name, AnsiString Surname,
            int Experience, AnsiString Degree, AnsiString Subject);
 
};

#include <vcl.h>
#pragma hdrstop
 
#include "Unit3.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm3 *Form3;
 
#include <string>
#include <iostream>
#include <iomanip>
 
//------------------------------------------------------------------------------
 
int write_counter = 0;
Human *my_array = new Human[write_counter];
 
//---------------------------------------------------------------------------
 
Human::Human(){
number = -1;
age = 0;
name = "";
surname = "";
};
 
Human::Human(int Number, int Age, AnsiString Name, AnsiString Surname){
 
number = Number;
age = Age;
name = Name;
surname = Surname;
 
}
 
Student::Student():Human(){
 
group = 1;
course = 1;
specialization  = "dddd";
};
 
Student::Student(int Number, int Age, AnsiString Name,
         AnsiString Surname, int Group, int Course, AnsiString Specialization) :
         Human(Number, Age, Name, Surname){
 
group = Group;
course = Course;
specialization = Specialization;
 
};
 
Teacher::Teacher(int Number, int Age, AnsiString Name, AnsiString Surname,
         int Experience, AnsiString Degree, AnsiString Subject):
         Human(Number, Age, Name, Surname){
 
experience = Experience;
degree = Degree;
subject = Subject;
 
};
 
 
__fastcall TForm3::TForm3(TComponent* Owner)
    : TForm(Owner)
{
}
//---------------------------------------------------------------------------
 
void __fastcall TForm3::Button_AddClick(TObject *Sender)
{
 
write_counter++;
 
Human *newArray = new Human[write_counter];
 
for (int i = 0; i < write_counter - 1; i++)
{
newArray[i] = my_array[i];
}
 
delete[] my_array;
 
my_array = newArray;
 
if (Check_Student->Checked) {
 
    my_array[write_counter] = new Student(write_counter, 2,
              "aa", "dd",  4,
                 6, "gf");
}
}

void __fastcall TForm3::Button_AddClick(TObject *Sender)
{
   write_counter++;
   Human **newArray = new Human*[write_counter]; // массив УКАЗАТЕЛЕЙ на базовый класс
   for (int i = 0; i < write_counter - 1; i++)
         newArray[i] = my_array[i];  // my_array тоже должен быть массив УКАЗАТЕЛЕЙ на базовый класс
   delete[] my_array;
   my_array = newArray;
   if (Check_Student->Checked) {
         my_array[write_counter] = new Student(write_counter, 2,"aa", "dd",  4, 6, "gf");
}
}

Human **my_array = new Human*[write_counter];  // массив УКАЗАТЕЛЕЙ на базовый класс

static_cast<Student*>(my_array[i])->get_specialization();