Editing class private in C++ - c++

Question

I am working on this code. It is not yet done. The problem is that I do not get why I cannot update numAccount in my simple_account.h. It just keeps printing out "1" if I print out numAccount. Can anyone tell me why I cannot access and change the private value here?
main.cc
#include <iostream>
#include "simple_account.h"
using namespace std;
int main() {
char job;
int i = 0;
while (true) {
cout << "Job?" << endl;
cin >> job;
if (job == 'Q')
break;
if (job == 'N') {
Admin* user = new Admin[10];
(user+i)->newAccount(i);
cout << "i: " << i << endl;
i++;
}
}
simple_account.h
#pragma once
#include <iostream>
class Account {
public:
int id;
int b = 0;
};
class Admin {
class Account {
int id;
int b = 0;
};
int numAccount = 0;
Account **acnt[10];
public:
void newAccount();
void deposit(Account id, int money);
void withdrawal(Account id, int money);
void transfer(Account id1, Account id2, int money);
void check(Account id);
};
simple_acount.cc
#include "simple_account.h"
void Admin::newAccount() {
numAccount += 1;
}

Answer 1

The problem occurs when you press 'N' to open a new account.
if (job == 'N') {
Admin* user = new Admin[10];
(user+i)->newAccount(i);
cout << "i: " << i << endl;
i++;
}
This code creates ten new Admin objects, and initializes each one with the default constructor. Each Admin has its own numAccount member, which is initialized to zero because that's the default value you specified here: int numAccount = 0;
After creating ten Admin objects, the code then picks one with (user+i) and calls newAccount(i). This should not compile, because the newAccount() method does not take a parameter. But if it worked, it would increment that one Admin's numAccount member to 1 from the initial 0.
(There's another problem here, which is that when i reaches 10, you will be trying to call newAccount() on something that's outside your array of Admin objects, so you're going to see some undefined behavior.)
How to fix this.... depends on what you're trying to do. As suggested, you can make numAccounts a static member of the Admin class. But I think you'll need to review your design: what is an Admin, and how many should there be?