#include <iostream>
#include <iomanip>

using namespace std;

int selection, PIN_input = 0, attempts = 0;
const int PIN = 1065, attempts_limit = 3;
double balance = 100, money;

// This assignment is worth 5 points
// -2 if the pin number is not utilized as a constant

const int
	sel_op1 = 1,
	sel_op2 = 2,
	sel_op3 = 3,
	sel_op4 = 4;
const string
	option1 = "Withdraw",
	option2 = "Deposit",
	option3 = "Check Balance",
	option4 = "Exit";

int main()
{
	cout << fixed << setprecision(2);
	cout << "Enter PIN number: ";
	while(PIN_input != PIN && attempts < attempts_limit)
	{
		if(attempts > 0)
			cout << "Wrong PIN. Try again: ";

		cin >> PIN_input;
		
		if(++attempts == attempts_limit && PIN_input != PIN)
			cout << "Wrong PIN. Ending session." << endl;
		
	}

	while(PIN_input == PIN && selection != sel_op4)
	{
		cout << "Welcome!" << endl
		     << "1. " << option1 << endl
		     << "2. " << option2 << endl
		     << "3. " << option3 << endl
		     << "4. " << option4 << endl
		     << "Please select your option: ";
		cin >> selection;

//		bool flag = true;
		switch(selection)
		{
		  case sel_op1:	// Withdraw money
		    //bool flag = true;	// Cannot declare variables inside switch-case
		    do
		    {
		      cout << "Amount to withdraw ($): ";
		      cin >> money;
		      cin.ignore();

		      if(money > balance)
		        cout << "Withdrawal amount exceeds balance! "
			     << "Available balance is $" << balance << ".\n";
/*		      else
		      {
			balance -= money;
			flag = false;
			cout << "Your balance is now $" << balance << ".\n";
			cout << "Press Enter to continue";
			cin.get();
		      }*/
		    } while(money > balance /*&& flag*/);
		    balance -= money;
		    cout << "Your balance is now $" << balance << ".\n";
		    cout << "Press Enter to continue";
		    cin.get();
		    break;

		  case sel_op2:	// Deposit money
		    cout << "Amount to deposit ($): ";
		    cin >> money;
		    cin.ignore();

		    balance += money;
		    cout << "Your balance is now $" << balance << ".\n";
		    cout << "Press Enter to continue";
		    cin.get();
		    break;

		  case sel_op3:	// Check current balance
		    cout << "Your current balance is $" << balance << ".\n";
		    cout << "Press Enter to continue";
		    cin.get();
		    break;
		
		  case sel_op4:	// Exit program
		    cout << "Have a nice day!" << endl;
		    break;
		
		  default:
		    cout << "Invalid option. Please try again.\n";
		    break;
		}
	}

	//if(PIN_input == PIN)
	//	cout << "Have a nice day!" << endl;

	return 0;
}