using System;

​

    public class Program

    {

        public static void Main()

        {

            string newPin,userPin,retype,billerName,y;

            string dpin = "4040";

            int deposit,withdraw,billAmount = 0;

            int balance = 10000;

            string userChoice;

            string yes = "y";

            Console.WriteLine("Welcome to BPI ATM Banking");

            Console.Write("Enter the Pin: ");

            userPin = Console.ReadLine();

            while(!(userPin.Equals(dpin)))

            {

            Console.WriteLine("Wrong Pin Try again");

            Console.Write("Enter the Pin: ");

            userPin = Console.ReadLine();

            }

            do

            {

            Console.WriteLine("[1] Balance Inquiry \n" +

                              "[2] Withdraw \n" +

                              "[3] Deposit\n" +

                              "[4] Change Pin\n" +

                              "[5] Paybills \n" +

                              "[x] Cancel ");

            Console.Write("Please select Transaction: ");

            userChoice = Console.ReadLine();

            switch(userChoice)

            {

                case "1":

                     Console.WriteLine("Your current balance in your account is {0}",balance);

                     break;

                case "2":

                     Console.Write("Enter amount to withdraw: ");

                     withdraw = int.Parse(Console.ReadLine());

                     Console.WriteLine("Please collect the cash {0}",withdraw);

                     balance = balance - withdraw;

                     Console.WriteLine("Your current balance in your account is {0}",balance);

                     break;

                case "3":

                     Console.Write("Enter the amount to be deposit: ");

                     deposit = int.Parse(Console.ReadLine());

                     balance = balance + deposit;

                     Console.WriteLine("Your current balance in your account is {0}",balance);

                     break;

                case "4":

                Console.Write("Want to change your pin? \n" +

                                  "Enter your previous pin: ");

                userPin = Console.ReadLine();

                Console.Write("Enter your new pin: ");

                newPin = Console.ReadLine();

                Console.Write("Re-type new pin: ");

                retype = Console.ReadLine();

                while(!((newPin.Equals(retype)))&&(!(retype.Equals(newPin)))&&(!((userPin.Equals(newPin)))&&(!((newPin.Equals(userPin))))))

                {

                     Console.Write("New pin mismatched. Try Again. \n" +

                                  "Enter your new pin: ");

                     userPin = Console.ReadLine();

                     Console.Write("Re-type new pin: ");

                     newPin = Console.ReadLine();

                }

                dpin = newPin;

                Console.WriteLine("Your pin is changed now.");

                    break;

                case "5":

                     Console.Write("Enter biller name(Globe, Cepalco, Parasat, Credit Card):");

                     billerName = Console.ReadLine();

                switch(billerName)

                {

                        case "Globe":

                        case "globe":

                        billerName = "Globe";

                        Console.Write("Enter the amount of bill: ");

                        billAmount = int.Parse(Console.ReadLine());

                              break;

                        case "cepaclo":

                        case "Cepalco":

                        billerName = "Cepalco";

                        Console.Write("Enter the amount of bill: ");

                        billAmount = int.Parse(Console.ReadLine());

                              break;

                        case "parasat":

                        case "Parasat":

                        billerName = "Parasat";

                        Console.Write("Enter the amount of bill: ");

                        billAmount = int.Parse(Console.ReadLine());

                              break;

                        case "credit card":

                        case "Credit Card":

                        billerName = "Credit Card";

                        Console.Write("Enter the amount of bill: ");

                        billAmount = int.Parse(Console.ReadLine());

                              break;

                        default:

                              break;

                }      

                        Console.WriteLine("{0} paid to Credit {1}",billAmount,billerName);

                        balance = balance - billAmount;

                        Console.WriteLine("Your current balance in your account is {0}",balance);

                              break;

                default:

                Console.WriteLine("Thank You for banking with us. Goodbye!");

                     return;

            }

            Console.Write("Proceed with another transaction? y/n: ");

            y = Console.ReadLine();

            }while((y.Equals(yes)));

            Console.WriteLine("Thank You for banking with us. Goodbye!\n");

        }

    }

​