PIN Lockout

Type in the following code, and get it to compile.

import java.util.Scanner;

public class PinLockout
{
	public static void main( String[] args )
	{
		Scanner keyboard = new Scanner(System.in);
		int pin = 12345;
		int tries = 0;

		System.out.println("WELCOME TO THE BANK OF MITCHELL.");
		System.out.print("ENTER YOUR PIN: ");
		int entry = keyboard.nextInt();
		tries++;

		while ( entry != pin && tries < 3 )
		{
			System.out.println("\nINCORRECT PIN. TRY AGAIN.");
			System.out.print("ENTER YOUR PIN: ");
			entry = keyboard.nextInt();
			tries++;
		}

		if ( entry == pin )
			System.out.println("\nPIN ACCEPTED. YOU NOW HAVE ACCESS TO YOUR ACCOUNT.");
		else if ( tries >= 3 )
			System.out.println("\nYOU HAVE RUN OUT OF TRIES. ACCOUNT LOCKED.");
	}
}

What You Should See

WELCOME TO THE BANK OF MITCHELL.
ENTER YOUR PIN: 10101

INCORRECT PIN. TRY AGAIN.
ENTER YOUR PIN: 23232

INCORRECT PIN. TRY AGAIN.
ENTER YOUR PIN: 99999

YOU HAVE RUN OUT OF TRIES. ACCOUNT LOCKED.

What You Should Do on Your Own

Assignments turned in without these things will receive no credit.

  1. Change the code so that it locks them out after 4 tries instead of 3. Make sure to change the message at the bottom, too.
  2. Move the "maximum tries" value into a variable, and use that variable everywhere instead of just the number.


©2013 Graham Mitchell

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