using System;

public class Program

{

    public static void Main()

    {

        {Item item=new Item();

            string Title="Happry Potter";

            string Publisher="default";

            DateTime YearPublished=DateTime.Now;

            int ISBN=00000000;

            double Price=0;

            DateTime YearPurchased=DateTime.Now;

            Console.WriteLine(Title+Publisher);

        }

    }

}

​

public class Item

{

    //add properties

    public string Title {get;set;}

    public string Publisher{get;set;}

    public DateTime YearPublished{get;set;}

    public string ISBN{get;set;}

    public double Price{get;set;}

    public DateTime YearPurchased{get;set;}

 //add method

    public virtual void Test()

    {

        Console.WriteLine(Title+Publisher);

    }

    public virtual string WarrantyDetails()

    {

        return "1-Year";

    }

    public virtual void Purchase()

    {

        Console.WriteLine("This item"+this.Title+"has been purchased successfully!");

    }

}

​

public class Book:Item,IWebItem  //book extends Item

{

    //set properties

    public string Author {get;set;}

    public string Edition{get;set;}

    public string Volume{get;set;}

    //default constructor

    //code to overload

    public override void Test()

    {

    Console.WriteLine(this.Title+this.Publisher+this.Author+this.Edition);  

    }

    public override string WarrantyDetails()

    {

        return "This item has a 6 month warranty";

    }

    public override void Purchase() 

    {

        Console.WriteLine("This book"+this.Title+"has been purchased successfully!");

    }

    public int WebID 

    {get;

    set;}

    public Boolean FreeShipping

    {get;

     set;

 } 

}

public class MusicCD:Item,IWebItem //////// overload missing 

{

    //set field

    public string Artist{get;set;}

    public int Volume{get;set;}

    public int WebID {get;set;}

    public Boolean FreeShipping

    {get;set;} 

    //overload the method

    public void Test(int I)

    {if (Volume>=0 && Volume<=10)

    {Console.WriteLine(this.Title+this.Publisher+this.Artist+this.Volume);}

     else 

     {Console.WriteLine("Please enter 0-10 for Volume");}

        }

    public override string WarrantyDetails()

    {

        return  "This item has a 3 month warranty";

    }

    public override void Purchase()

    {

    Console.WriteLine("This CD"+this.Title+"has been purchased successfully!"); 

    }

}

​

interface IWebItem

{int WebID {get;set;}

 Boolean FreeShipping{get; set;} 

}   

public class Software:Item

{

    public string Version{get;set;}

    public override void Test()

    {Console.WriteLine(this.Title+this.Publisher+this.Version); }

    public override string  WarrantyDetails() 

    {Console.WriteLine("This item has a 1 month warranty");}

    public override void Purchase()

    {Console.WriteLine("This software"+this.Title+"has been purchased successfully!");}

}

​

​