While Loops

import java.util.Scanner;

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

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

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

        System.out.println("\nPIN ACCEPTED. YOU NOW HAVE ACCESS TO YOUR ACCOUNT.");
    }
}

import java.util.Random;
import java.util.Scanner;

public class KeepGuessing
{
    public static void main( String[] args )
    {
        Random r = new Random();
        Scanner keyboard = new Scanner(System.in);
        int number = 1 + r.nextInt(10);
        int guess;

        System.out.println("I have chosen a number between 1 and 10. Try to guess it.");
        System.out.print("Your guess: ");
        guess = keyboard.nextInt();

        while ( guess != number )
        {
            System.out.println("That is incorrect. Guess again.");
            System.out.print("Your guess: ");
            guess = keyboard.nextInt();
        }

        System.out.println("That's right! You're a good guesser.");
    }
}

import java.util.Random;

public class DiceDoubles
{
    public static void main( String[] args )
    {
        Random r = new Random();

        int roll1 = 1 + r.nextInt(6);
        int roll2 = 1 + r.nextInt(6);

        System.out.println("HERE COMES THE DICE!\n");

        while ( roll1 != roll2 )
        {
            System.out.printf("Roll #1: %s\n", roll1);
            System.out.printf("Roll #2: %s\n", roll2);
            System.out.printf("The total is %s!\n\n", roll1 + roll2);

            roll1 = 1 + r.nextInt(6);
            roll2 = 1 + r.nextInt(6);
        }

        System.out.printf("Roll #1: %s\n", roll1);
        System.out.printf("Roll #2: %s\n", roll2);
        System.out.printf("The total is %s!\n", roll1 + roll2);
    }
}

import java.util.Scanner;

public class CountingWhile
{
    public static void main( String[] args )
    {
        Scanner keyboard = new Scanner(System.in);

        System.out.println( "Type in a message, and I'll display it five times." );
        System.out.print( "Message: " );
        String message = keyboard.nextLine();

        int n = 0;
        while ( n < 5 )
        {
            System.out.println( (n+1) + ". " + message );
            n++;
        }

    }
}

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.");
    }
}

import java.util.Random;
import java.util.Scanner;

public class NumberGuessingWithCounter
{
    public static void main( String[] args )
    {
        Random r = new Random();
        Scanner keyboard = new Scanner(System.in);
        int number = 1 + r.nextInt(10);
        int guess;
        int tries = 0;

        System.out.println("I have chosen a number between 1 and 10. Try to guess it.");
        System.out.print("Your guess: ");
        guess = keyboard.nextInt();
        tries++;

        while ( guess != number )
        {
            System.out.println("That is incorrect. Guess again.");
            System.out.print("Your guess: ");
            guess = keyboard.nextInt();
            tries++;
        }

        System.out.println("That's right! You're a good guesser.");
        System.out.printf("It only took you %s tries.\n", tries);
    }
}

import java.util.Random;
import java.util.Scanner;

public class HiLoLimited
{
    public static void main( String[] args )
    {
        Random r = new Random();
        Scanner keyboard = new Scanner(System.in);
        int number = 1 + r.nextInt(100);
        int guess;
        int tries = 1;

        System.out.println("I'm thinking of a number between 1-100. You have 7 guesses.");

        System.out.print("First guess: ");
        guess = keyboard.nextInt();

        while ( guess != number && tries < 7 )
        {
            if ( guess < number )
                System.out.println("Sorry, you are too low.");
            if ( guess > number )
                System.out.println("Sorry, that guess is too high.");

            System.out.printf("Guess #%s: ", tries + 1);
            guess = keyboard.nextInt();
            tries++;
        }

        if ( guess == number )
            System.out.println("You guessed it! What are the odds?!?");
        else
            System.out.println("Sorry, you didn't guess it in 7 tries. You lose.");
    }
}

import java.util.Scanner;

public class AddingValuesInALoop
{
    public static void main( String[] args )
    {
        Scanner keyboard = new Scanner(System.in);
        int number;
        int total = 0;

        System.out.println("I will add up the numbers you give me.");

        System.out.print("Number: ");
        number = keyboard.nextInt();
        total += number;
        System.out.printf("The total so far is %s", total);

        while ( number != 0 )
        {
            System.out.print("Number: ");
            number = keyboard.nextInt();
            total += number;
            if (number != 0){
                System.out.printf("The total so far is %s", total);
            } else {
                System.out.printf("\nThe total is %s", total);
            }
        }
    }
}

import java.util.Scanner;

public class SafeSquareRoot
{
    public static void main( String[] args )
    {
        Scanner keyboard = new Scanner(System.in);
        double number;

        System.out.println("SQUARE ROOT!");
        System.out.print("Enter a number: ");
        number = keyboard.nextDouble();

        while ( number < 0 )
        {
            System.out.println("You can't take the square root of a negative number, silly.");
            System.out.print("Try again: ");
            number = keyboard.nextDouble();
        }

        System.out.printf("The square root of %s is %s.\n", number, Math.sqrt(number));
    }
}

import java.util.Scanner;

public class RightTriangleChecker
{
    public static void main( String[] args )
    {
        Scanner keyboard = new Scanner(System.in);
        int side1, side2 = 0, side3 = 0;
        int stop = 2;

        System.out.println("Enter three integers:");
        System.out.print("Side 1: ");
        side1 = keyboard.nextInt();

        while ( stop <= 3 )
        {
            System.out.printf("\nSide %s: ", stop);
            if ( stop == 2 )
            {
                side2 = keyboard.nextInt();
                while ( side2 < side1 )
                {
                    System.out.printf("%s is smaller than %s. Try again.\n", side2, side1);
                    System.out.printf("Side %s: ", stop);
                    side2 = keyboard.nextInt();
                }
            }
            else if ( stop == 3 )
            {
                side3 = keyboard.nextInt();
                while ( side3 < side2 )
                {
                    System.out.printf("%s is smaller than %s. Try again.\n", side3, side2);
                    System.out.printf("Side %s: ", stop);
                    side3 = keyboard.nextInt();
                }
            }
            stop++;
        }

        System.out.printf("\nYour three sides are %s %s %s\n", side1, side2, side3);

        if ( Math.pow(side1, 2) + Math.pow(side2, 2) == Math.pow(side3, 2) )
            System.out.println("These sides *do* make a right triangle.  Yippy-skippy!");
        else
            System.out.println("NO!  These sides do not make a right triangle!");
    }
}

import java.util.Scanner;

public class CollatzSequence
{
    public static void main( String[] args )
    {
        Scanner keyboard = new Scanner(System.in);
        int number;

        System.out.print("Starting number: ");
        number = keyboard.nextInt();

        System.out.printf("%s\t", number);
        while ( number != 1 )
        {
            if ( number % 2 == 0 )
                number /= 2;
            else
                number = 3 * number + 1;

            System.out.printf("%s\t", number);
        }
    }
}

import java.util.Scanner;

public class Adventure2
{
    public static void main( String[] args )
    {
        Scanner keyboard = new Scanner(System.in);

        int nextroom = 1;
        String choice = "";

        while ( nextroom != 0 )
        {
            if ( nextroom == 1 )
            {
                System.out.println( "Kamu saat ini di halaman sekarang mau kemana? \"ruang tamu\" / \"keluar\"" );
                System.out.print( "> " );
                choice = keyboard.nextLine();
                if ( choice.equals("ruang tamu") )
                    nextroom = 2;
                else if ( choice.equals("keluar") )
                    nextroom = 0;
                else
                    System.out.println( "ERROR." );
            }
            if ( nextroom == 2 )
            {
                System.out.println( "Kamu saat ini di ruang tamu sekarang mau kemana? \"kamar tidur\" / \"keluar\"" );
                System.out.print( "> " );
                choice = keyboard.nextLine();
                if ( choice.equals("kamar tidur") )
                    nextroom = 3;
                else if ( choice.equals("keluar") )
                    nextroom = 0;
                else
                    System.out.println( "ERROR." );
            }
            if ( nextroom == 3 )
            {
                System.out.println( "Kamu saat ini di kamar tidur sekarang mau kemana? \"kamar mandi\" / \"tidur\"" );
                System.out.print( "> " );
                choice = keyboard.nextLine();
                if ( choice.equals("kamar mandi") )
                    nextroom = 4;
                else if ( choice.equals("tidur") )
                    nextroom = 0;
                else
                    System.out.println( "ERROR." );
            }
            if ( nextroom == 4 )
            {
                System.out.println( "Kamu saat ini di kamar mandi sekarang mau kemana? \"ambil handuk\" / \"gajadi\"" );
                System.out.print( "> " );
                choice = keyboard.nextLine();
                if ( choice.equals("ambil handuk") )
                    nextroom = 5;
                else if ( choice.equals("gajadi") )
                    nextroom = 0;
                else
                    System.out.println( "ERROR." );
            }
            if ( nextroom == 5 )
            {
                System.out.println( "Setelah kamu ambil handuk sekarang mau kemana? \"mandi\" / \"balik kamar\"" );
                System.out.print( "> " );
                choice = keyboard.nextLine();
                if ( choice.equals("mandi") )
                    nextroom = 6;
                else if ( choice.equals("balik kamar") )
                    nextroom = 3;
                else
                    System.out.println( "ERROR." );
            }
            if ( nextroom == 2 )
            {
                System.out.println( "Kamu saat ini sedang mandi sekarang mau kemana? \"selesai\" / \"tamatina ae lah\"" );
                System.out.print( "> " );
                choice = keyboard.nextLine();
                if ( choice.equals("selesai") )
                    nextroom = 0;
                else if ( choice.equals("tamatin ae lah") )
                    nextroom = 0;
                else
                    System.out.println( "ERROR." );
            }
        }

        System.out.println( "\nEND." );
    }
}

import java.util.Scanner;

public class BabyNim
{
    public static void main( String[] args )
    {
        Scanner keyboard = new Scanner(System.in);
        int pileA = 3, pileB = 3, pileC = 3;
        String pile;
        int num;

        System.out.printf("A: %s\tB: %s\tC: %s\n", pileA, pileB, pileC);

        while ( pileA > 0 || pileB > 0 || pileC > 0 )
        {
            System.out.print("\nChoose a pile: ");
            pile = keyboard.next();
            System.out.print("How many to remove from pile " + pile + ": ");
            num = keyboard.nextInt();

            if ( pile.equals("A") )
                pileA -= num;
            else if ( pile.equals("B") )
                pileB -= num;
            else if ( pile.equals("C") )
                pileC -= num;

            System.out.printf("\nA: %s\tB: %s\tC: %s\n", pileA, pileB, pileC);
        }

        System.out.println("\nAll piles are empty. Good job!");
    }
}

import java.util.Scanner;

public class Nim
{
    public static void main( String[] args )
    {
        Scanner keyboard = new Scanner(System.in);
        int pileA = 3, pileB = 4, pileC = 5;
        String pile;
        int num;

        System.out.print("Player 1, enter your name: ");
        String player1 = keyboard.next();
        System.out.print("Player 2, enter your name: ");
        String player2 = keyboard.next();

        System.out.printf("\nA: %s\tB: %s\tC: %s\n", pileA, pileB, pileC);

        while ( pileA > 0 || pileB > 0 || pileC > 0 )
        {
            System.out.print("\n" + player1 + ", choose a pile: ");
            pile = keyboard.next();
            System.out.print("How many to remove from pile " + pile + ": ");
            num = keyboard.nextInt();

            if ( pile.equals("A") )
                pileA -= num;
            else if ( pile.equals("B") )
                pileB -= num;
            else if ( pile.equals("C") )
                pileC -= num;

            System.out.printf("\nA: %s\tB: %s\tC: %s\n", pileA, pileB, pileC);

            if ( pileA == 0 && pileB == 0 && pileC == 0 )
            {
                System.out.println("\n" + player1 + ", there are no counters left, so you WIN!");
                break;
            }

            System.out.print("\n" + player2 + ", choose a pile: ");
            pile = keyboard.next();
            System.out.print("How many to remove from pile " + pile + ": ");
            num = keyboard.nextInt();

            if ( pile.equals("A") )
                pileA -= num;
            else if ( pile.equals("B") )
                pileB -= num;
            else if ( pile.equals("C") )
                pileC -= num;

            System.out.printf("\nA: %s\tB: %s\tC: %s\n", pileA, pileB, pileC);

            if ( pileA == 0 && pileB == 0 && pileC == 0 )
            {
                System.out.println("\n" + player2 + ", there are no counters left, so you WIN!");
                break;
            }
        }
    }
}