如何查找哪个类对象位于数组的特定索引上(多态性）

我有一个银行的基类，它被"储蓄"、"支票"、"流动"和"投资"类继承。我正在为我的学校练习多态性。

我有一个很长的代码，我不能在这里分享。我在这段代码中所做的只是在指针 this->bank 处分配动态数组(我有单独的函数，grow2D(，并通过询问用户是否要创建"保存"、"检查"、"当前"或"投资"帐户的对象在运行时创建对象。我的问题是，在我通过询问用户创建完对象后，我如何检查对象的哪种类型("保存"、"检查"、"当前"或"投资"(位于特定索引上。

例如，使用 在银行 [0] 创建一个类型为"储蓄"的对象。当用户完成添加所有帐户后，如何在代码中稍后找到 bank[0] 上所在的对象类型？

string name;
unsigned long long int accountNumber;
unsigned long int balance;
int option = 0;
size++;
this->bank = grow2D(bank, size);
cout <<endl << "1 for Saving" << endl;
cout << "2 for Checking" << endl;
cout << "3 for Current" << endl;
cout << "4 for Investment" << endl;
cout << "Enter option";
cin >> option;
cin.ignore();
cout << "Enter name";
getline(cin, name);
cout << "Enter Account Number";
cin >> accountNumber;
cout << "Enter Balance";
cin >> balance;
if(option==1)
{
int interestRate;
cout << "Enter Interest Rate: ";
cin >> interestRate;
bank[size - 1] = new Saving(name,accountNumber,balance,interestRate);
}
else if (option == 2)
{
int fee;
cout << "Enter Fee: ";
cin >> fee;
bank[size - 1] = new Checking(name, accountNumber, balance,fee);
}
else if (option == 3)
{
int fee;
unsigned long int minimumBalance;
cout << "Enter Fee: ";
cin >> fee;
cout << "Enter Minimum balance: ";
cin >> minimumBalance;
bank[size - 1] = new Current(name, accountNumber, balance,fee,minimumBalance);
}
else if (option == 4)
{
int fee;
unsigned long int minimumBalance;
int profit;
cout << "Enter Fee: ";
cin >> fee;
cout << "Enter Minimum balance: ";
cin >> minimumBalance;
cout << "Enter Profit: ";
cin >> profit;
bank[size - 1] = new Investment(name, accountNumber, balance, fee, minimumBalance,profit);
}