atm hep!

#include <iostream>
#include <fstream>
#include <iomanip>
#include <cstdlib>

using namespace std;

void welcome();
int login(int, int);
void menu();
void withdrawal();
void deposit();
void update();
void balance();
void quit();

int main()
{
	int accountID;
	int pin;
	
	cout << "************************************************************" << endl;
	cout << "             Welcome to the Bank of the Universe" << endl;
	cout << "************************************************************" << endl << endl;
	cout << "Please enter your nine digit account ID number." << endl;
	cin >> accountID;
	cout << "Please enter your four digit PIN number." << endl;
	cin >> pin;
///////////////////////////////////////////////////
	if pin == 
	
	


	void menu();
		
		return 0;
}

void menu()
{
	int choice;

	cout << "************************************************************" << endl;
	cout << "             Welcome to the Bank of the Universe" << endl;
	cout << "************************************************************" << endl << endl;
	cout << "1. Withdrawal" << endl;
	cout << "2. Deposit" << endl;
	cout << "3. Update" << endl;
	cout << "4. Balance" << endl;
	cout << "5. Quit" << endl << endl;
	cin >> choice;

	switch (choice)
	{
		case 1: void withdrawal(); break;
		case 2: void deposit(); break;
		case 3: void update(); break;
		case 4: void balance(); break;
		case 5: void quit(); break;
		default: cout << "Please pick a valid menu item" << endl; break;
		
	}
	return 0;
}

void withdrawal()
{
	float amount;
	
	cout << "Enter the amount you wish to withdraw" << endl;
	cin >> amount;
	//if (current_account.get_balance() < amount)
	//	cout << "Sorry, you have insufficient funds." << endl;
	//else
	//	current_account.withdraw(amount);
}







/////////////////////////////////////////////
void quit()
{
	cout << "Thank you for using the Bank of the Universe!" << endl;
	return;
}