using System;

using System.Collections.Generic;

//using Newtonsoft.Json;  //Please uncomment once the json.net has been added

//using System.IO;        //Please uncomment when the block code responsible for saving the json file has been uncommented

​

​

public class Program

{

    public class Item

    {

        //Declare the properties of the Class Item

        public string Type{get;set;}

        public string Name{get;set;}

        public string Area{get;set;}

    }

    public static void Main()

    {

    //Question#1:

        //Declare the list items and add the 3 elements into it before showing the result

        List<Item> items = new List<Item>();

            items.Add(new Item{ Type="Circle", Name="BlueCircle", Area="12cm²" });

            items.Add(new Item{ Type="Triangle", Name="White Triangle", Area="15cm²"});

            items.Add(new Item{ Type="Square", Name="Red Square", Area="16cm²"});

            //Loop through the list and display its values

            foreach(var item in items)

            Console.WriteLine("{0} - {1} - {2}",item.Type,item.Name,item.Area);

​

    //Question#2:  

         //Prompting the user to enter a new Geometric shape

         Console.WriteLine("Please Enter the new type you want to add :");

         string typeInput = String.Format(Console.ReadLine());

         //Prompting the user to enter a new name for this shape 

         Console.WriteLine("Enter a Name for your Shape:");

         string nameInput = String.Format(Console.ReadLine());

         //Prompting the user to enter a new area for this shape 

         Console.WriteLine("Enter the area of your Shape:");

         string areaInput = String.Format(Console.ReadLine());

         //Displaying the string as comma seperated so that we can match what the exercise is asking for (parsing)                         

          var newItem = string.Concat(typeInput + " " , nameInput + " " , areaInput);

         Console.WriteLine("{0}",newItem);

         //Declare an array to split by spaces

         string[] thisArray = newItem.Split(' ');

         //Adding the new element to the list by invoking the AddNewItem method from the service class extension            

         items.AddNewItem(new Item{ Type=thisArray[0], Name= thisArray[1], Area=thisArray[2]  });

​

    //Question#4:Display the price of all the elements of the collection based on the first way of calculating      

        //Initializing the area

        var superficie = 5 ;

        //Instantiating the anonymous type Pricer

        var pricer = new Pricer() ;

        //invoking the overriding method Price of the first child class Pricer

        var cout1 = pricer.Price(superficie);

        foreach(var item in items)

            {

                Console.WriteLine("{0} - {1} - {2} - {3}€",item.Type,item.Name,item.Area,cout1);

            }

    //Question#5:Display the price of all the elements of the collection based on the first way of calculating      

        //Instantiating the anonymous type Pricer1 

        var pricer1 = new OtherPricer() ;

        //invoking the overriding method Price of the second child class Pricer1

        var cout2 = pricer1.Price(superficie);

           foreach(var item in items)

            {

                Console.WriteLine("{0} - {1} - {2} - {3}€",item.Type,item.Name,item.Area,cout2);

            }

    }

}

​

            //Method that adds the new item from question#2  

            public static class Service

            {

                public static List<T> AddNewItem<T>(this List<T> myList,T item)

                {

                    myList.Add(item);

                    return myList;

    /*Question#3: Please uncomment the below code once Json.NET has been installed from "http://www.newtonsoft.com/json" or added through Nugget

                    //Save the newly created list to a file using the Serializer object from Json.Net(The fastest)

                    string json = JsonConvert.SerializeObject(myList.ToArray());

                    //write string to a json file format

                    File.WriteAllText(@"D:\Mydocuments\Collection.txt", json);*/

                }

            }

​

                //Declaring the interface signatures

                public interface IPricer

                {

                                int Price(int superficie) ;

                }

                //Adding a new Base class that inherits from the interface 

                public abstract class BasePricer : IPricer

                {   

                    //Make the Base class method abstract

                    public abstract int Price(int superficie);

                }

                //Inherit from the Base Class BasePricer

                public class Pricer : BasePricer

                {

                    //Override the Base class method from the first derived class

                    public override int Price(int superficie)

                    {

                                    return superficie * 2 ;

                    }

                }

                public class OtherPricer : BasePricer

                { 

                    //Override the Base class method from the second derived class

                    public override int Price(int  superficie )

                    {

                                    return superficie * 4 ;

                    }

                }

​