using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.IO;

​

namespace ConsoleApplication7

{

​

    public class Customer

    {

        private string first_name;

​

        private string last_name;

​

        public Order[] order { get; set; }

​

        public string FirstName

        {

            set

            {

              first_name =   string.IsNullOrEmpty(value) ? "Name cannot be null or empty" : value;

​

            }

            get

            {

                return string.IsNullOrEmpty(this.first_name) ? "No name is given" : this.first_name;

            }

        }

        public string LastName

        {

            set

            {

                last_name = string.IsNullOrEmpty(value) ? "Name cannot be null or empty" : value;

            }

            get

            {

                return string.IsNullOrEmpty(this.last_name) ? "No name is given" : this.last_name;

            }

        }

    }

​

    public class Order

    {

        private float price;

​

        public int quantity { get; set; }

​

        public Vehicle vehicle { get; set; }

​

        public float Price

        {

            set

            {

                this.price = (value <= 0) ? float.Parse("Price shouldn't be zero or negative") : value; 

            }

            get

            {

                return  this.price;

            }

        }

    }

​

    public class Vehicle

    {

        public string Description { get; set; }

        public int Wheels { get; set; }

​

        public int HP { get; set; }

        public double Length{ get; set; }

        public double Width{ get; set; }

        public double Height{ get; set; }

        public double Radius{ get; set; }

​

​

​

        public virtual double CargoCap()

        {

            return 0;

        }

​

    }

    public class Automobile : Vehicle

    {

        //public double Length, Width, Height;

        public override double CargoCap()

        {

            return Length * Width * Height;

​

        }

​

    }

​

    public class Motorcycle : Vehicle

    {

        // public double Radius, Height;

        public override double CargoCap()

        {

​

            return Math.PI * (Radius * Radius) * Height * 2;

​

​

        }

​

    }

​

​

    class Program

    {

        public static void Main(string[] args)

        {

            Customer[] customer = new Customer[4];

            customer[0] = new Customer { FirstName = "Joe", LastName = "Smith", order = new Order[2] };

​

            // customer[0] = customer1;

​

            Order item1 = new Order

            {

                quantity = 1,

                Price = 1000,

                vehicle = new Motorcycle

                {

                    Radius = 10,

                    Description = "Honda CD-70",

                    Height = 2,

                    HP = 70,

                    Wheels = 2

                }

            };

​

            customer[0].order[0] = item1;

            Order item2 = new Order

            {

                quantity = 1,

                Price = 35000,

                vehicle = new Automobile

                {

                    Length = 25,

                    Width = 20,

                    Height = 6,

                    Description = "Toyota",

                    HP = 2500,

                    Wheels = 4

                }

            };

            customer[0].order[1] = item2;

​

            customer[1] = new Customer { FirstName = "Muhammad", LastName = "Abbasi", order = new Order[2] };

            //customer[1] = customer2;

​

            Order item3 = new Order

            {

                quantity = 1,

                Price = 15000,

                vehicle = new Automobile

                {

                    Length = 5,

                    Width = 3,

                    Height = 2,

                    Description = "Honda Civic",

                    HP = 3500,

                    Wheels = 4

                }

​

            };

​

            customer[1].order[0] = item3;

            Order item4 = new Order

            {

                quantity = 1,

                Price = 2000,

                vehicle = new Motorcycle

                {

                    Radius = 12,

                    Wheels = 2,

                    Height = 3,

                    HP = 125,

                    Description = "Honda 125"

                }

​

​

            };

​

            customer[1].order[1] = item4;

            using(StreamWriter writer = new StreamWriter("file.txt"))

            {

        writer.WriteLine("======================================= PURCHASE ORDER RECORDING SYSTEM ================================== \n");

               // writer.Write("I am succeeded in writing to a file");

                foreach (var cust in customer)

                {

                    if (cust == null)

                        continue;

                    writer.WriteLine("\n");

                    writer.WriteLine("\n");

                    writer.WriteLine("Customer Name: {0,10} {1,20}", cust.FirstName, cust.LastName);

​

                    writer.WriteLine("=================================================================================================\n");

                    writer.WriteLine("Description      Price       Quantity        Horse Power     No. of Wheels       Cargo Capacity");

                    writer.WriteLine("-----------      -----       --------        -----------     -------------       --------------\n");

​

​

                    foreach (var ord in cust.order)

                    {

                        if (ord == null)

                            continue;

​

                        writer.WriteLine("{0,10}{1,11} {2,12} {3,15} {4,16} {5,25} ", ord.vehicle.Description, ord.Price, ord.quantity,

                        ord.vehicle.HP, ord.vehicle.Wheels,

                            ord.vehicle.CargoCap());

                        writer.WriteLine("\n");

                    }

                }

            }

                //Console.ReadLine();

            }

    }

}