​

​

using System;

​

public class DoughnutShop

{

    public static void Main()

    {

        char input;

        int choice = 0;

        bool flag = false;

        do

        {

            displayMenu();

            if (!Char.IsDigit(input = Console.ReadLine()[0]) || (choice = input - '0') < 1 || choice > 6)

            {

                Console.WriteLine("Please choose from 1 - 6 only. {0}", choice);

                continue;

            }

            flag = true;

        } while(!flag);

        PlainDoughnut pdObject = null;

        switch(choice)

        {

            case 1: pdObject = new PlainDoughnut();

                    break;

            case 2: pdObject = new Menu.PlainChoco();

                    break;

            case 3: pdObject = new Menu.PlainStrawberry();

                    break;

            case 4: pdObject = new Menu.ChocoCrunch();

                    break;

            case 5: pdObject = new Menu.StrawberrySprinkles();

                    break;

            case 6: pdObject = new Menu.CinnamonCrunch();

                    break;

            default: return;

        }

        Console.WriteLine("The total amount is {0}", pdObject.ComputeCost());

    }

    public static void displayMenu()

    {

        Console.WriteLine("Order a Dozen piece of Doughnut; choose a flavor:");

        Console.WriteLine("[1] Plain Doughnut");

        Console.WriteLine("[2] Plain Choco");

        Console.WriteLine("[3] Plain Strawberry");

        Console.WriteLine("[4] Choco Crunch");

        Console.WriteLine("[5] Strawberry Sprinkles");

        Console.WriteLine("[6] Cinnamon Crunch");

    }

}

​

public class Menu

{

    public class PlainChoco : PlainDoughnut

    {

        public PlainChoco()

        {

            Console.WriteLine("PlainChoco");

            Console.WriteLine("Toppings: ");

            toppings[tCount++] = new ChocoGlaze();

        }

    }

​

    public class PlainStrawberry : PlainDoughnut

    {

        public PlainStrawberry()

        {

            Console.WriteLine("PlainStrawberry");

            Console.WriteLine("Toppings: ");

            toppings[tCount++] = new StrawberryGlaze();

        }

    }

    public class ChocoCrunch : PlainChoco

    {

        public ChocoCrunch()

        {

            Console.WriteLine("ChocoCrunch");

            Console.WriteLine("Toppings: ");

            toppings[tCount++] = new PeanutCrunch();

        }

    }

​

    public class StrawberrySprinkles : PlainStrawberry

    {

        public StrawberrySprinkles()

        {

            Console.WriteLine("StrawberrySprinkles");

            Console.WriteLine("Toppings: ");

            toppings[tCount++] = new CandySprinkles();

        }

    }

    public class CinnamonCrunch : PlainDoughnut

    {

        public CinnamonCrunch()

        {

            Console.WriteLine("CinnamonCrunch");

            Console.WriteLine("Toppings: ");

            toppings[tCount++] = new CinnamonDust();

            toppings[tCount++] = new PeanutCrunch();

        }

    }

}

​

public class PlainDoughnut

{

    protected Topping[] toppings = new Topping[5];

    protected int tCount;

    private double cost;

    public PlainDoughnut()

    {

        Console.WriteLine("PlainDoughnut");

        cost = 20.00;

        tCount = 0;

    }

    public double ComputeCost()

    {

        foreach (Topping t in toppings)

        {

            if (t != null) cost += t.cost;

        }

        return cost;

    }

}

​

public interface Topping

{

    double cost { get; }

}

​

public class ChocoGlaze : Topping

{

    public ChocoGlaze()

    {

        Console.WriteLine("...ChocoGlaze");

    }

    public double cost

    {

        get { return 5.00; }

    }

}

​

public class StrawberryGlaze : Topping

{

    public StrawberryGlaze()

    {

        Console.WriteLine("...StrawberryGlaze");

    }

​

    public double cost

    {

        get { return 3.00; }

    }

}

​

public class CandySprinkles : Topping

{

    public CandySprinkles()

    {

        Console.WriteLine("...CandySprinkles");

    }

    public double cost

    {

        get { return 1.50; }

    }

}

​

public class PeanutCrunch : Topping

{

    public PeanutCrunch()

    {

        Console.WriteLine("...PeanutCrunch");

    }

    public double cost

    {

        get { return 1.75; }

    }

}

​

public class CinnamonDust : Topping

{

    public CinnamonDust()

    {

        Console.WriteLine("...CinnamonDust");

    }

    public double cost

    {

        get { return 1.25; }

    }

}

​

​

​