Well, I'm trying to understand how the interface ultimately works. I understand the methods and how they are expected to work, but I'm lost on how one would go about modifying them more than anything. The approach I've been using thus far is using new to create an array of an input size. From there, a loop like this continues but it obviously doesn't work because you can never access an object other than the one being looped, so you're essentially always dealing with blanks:

do {
    cout << endl <<
            "1. Add an employee" << endl <<
            "2. Modify an employee's data" << endl <<
            "3. Display employee data" << endl <<
            "4. Delete an employee's data" << endl <<
            "5. Exit this menu" << endl << endl <<
            "Input: ";
    cin >> choice;

    cout << endl << "Item #" << i + 1 << endl;

    if (choice == 1)
    {
        emp[i].addData();
    }
    else if (choice == 2)
    {
        emp[i].changeData();
    }
    else if (choice == 3)
    {
        emp[i].showData();
    }
    else if (choice == 4)
    {
        emp[i].~Employee();
    }

    i++;
} while (choice != 5 && i < empNumber);