using System;

​

    public class Program

    {

        public static void Main()

        {

            Customer[] custArray = new Customer[3];

​

            // First Customer

            custArray[0] = CreateCustomer("Joe", "Smith");

            custArray[0].Orders[0] = CreateOrder(new Automobile(2,2,2), 19.99M, 1);

            // Second Customer

            custArray[1] = CreateCustomer("Sally", "Jones");

            custArray[1].Orders[0] = CreateOrder(new Motorcycle(2.5, 3),39.99M,1);

            DisplayCustomerOrders(custArray);

​

        }

​

        private static Order CreateOrder(Vehicle Vehical, decimal Price, int Quantity)

        {

            return new Order() { Transport = Vehical, Price = Price, Quantity = Quantity };

        }

​

        private static Customer CreateCustomer(string FirstName, string LastName)

        {

            return new Customer() { FirstName = FirstName, LastName = LastName, Orders = new Order[2] };

        }

​

        private static void DisplayCustomerOrders(Customer[] custArray)

        {

            foreach (var customer in custArray)

            {

                if (customer == null)

                    continue;

                Console.WriteLine("Customer:\n");

                Console.WriteLine("{0, 15} {1, 17}", "First Name", "Last Name");

                Console.WriteLine("{0, 10} {1, 20}", customer.FirstName, customer.LastName);

                Console.WriteLine("========================================");

                Console.WriteLine("Orders:\n");

                foreach (var order in customer.Orders)

                {

                    if (order == null)

                        continue;

                    Console.WriteLine("{0, 10} {1, 10} {2, 10} {3, 10}", 

                        order.Transport.Description, 

                        order.Transport.CalculateCapacity(), 

                        order.Price, order.Quantity);

                }

                Console.WriteLine("\n\n");

            }

            Console.ReadLine();

        }

    }

​

    class Customer

    {

        public string FirstName {get; set;}

        public string LastName {get; set;}

        public Order[] Orders {get; set;}

    }

​

    class Order

    {

        public Vehicle Transport {get; set;}

        public decimal Price { get; set; }

        public int Quantity { get; set; }

    }

​

    abstract class Vehicle

    {

        public int Wheels { get; set; }

        public string Description { get; set; }

        public int HorsePower { get; set; }

        protected double Height { get; set; }

        public abstract double CalculateCapacity();

    }

​

    class Automobile : Vehicle

    {

        private double _length { get; set; }

        private double _width { get; set; }

​

        public Automobile(double Length, double Width, double Height)

        {

            this._length = Length;

            this._width = Width;

            base.Height = Height;

​

            base.Description = "Automobile";

        }

​

        public override double CalculateCapacity()

        {

            return _length * _width + base.Height;

        }

    }

​

    class Motorcycle : Vehicle

    {

        private double _radius { get; set; }

​

        public Motorcycle(double Radius, double Height)

        {

            _radius = Radius;

            base.Height = Height;

            base.Description = "Motorcycle";

        }

​

        public override double CalculateCapacity()

        {

            return (Math.PI * (_radius * _radius) * base.Height) * 2;

        }

    }

​