crear un cajero con todas sus funciones

#include <iostream>
using namespace std;

int get_money(int amount_withdrawn) {
  int available_bills[] = {100, 50, 20, 10, 5, 2, 1};
  int number_of_bills[7];
  for (int i = 0; i < 7; i++) {
    number_of_bills[i] = amount_withdrawn / available_bills[i];
    amount_withdrawn -= number_of_bills[i] * available_bills[i];
  }
  return 0;
}

int main() {
  int amount_withdrawn = 0;
  cout << "Amount to be withdrawn: ";
  cin >> amount_withdrawn;
  get_money(amount_withdrawn);
  return 0;
}