using System ;

using System.Collections.Generic;

​

namespace Program 

{

    public class Prg

    {

        public static void Main(string[] args)

        {

            IList<int> myList = new List<int>(); // -> []

            myList.Add(7); // -> [7]

            myList.Add(5); //-> [7, 5]

            myList.Insert(2,12); //-> [7, 12, 5]

            for (int i=0;i<myList.Count;i++)

            {

                Console.WriteLine(myList[i]);

            }

            myList.RemoveAt(1); // removed 12 -> [7, 5]

            myList.Add(1); // ->[1]

            myList.Add(2); //-> [1,2]

            //Console.WriteLine(myList);

            //Console.WriteLine(myList.Count); // -> 2      

            ISet<string> ingredients = new HashSet<string>();

            ingredients.Add("eggs");

            ingredients.Add("sugar");

            ingredients.Add("butter");

            ingredients.Add("salt");

            //Console.WriteLine(ingredients.Count);

            //Console.WriteLine(ingredients (0));

            IDictionary<string, int> myDictionary = new Dictionary<string, int>();          

            myDictionary.Add("Jenny", 34);

            myDictionary.Add("Livia", 28);

            myDictionary.Add("Paul", 31);

            string name = Console.ReadLine();

            do{

                switch (name)

                {

                  case "Jenny":

                      Console.WriteLine(myDictionary[name]);

                      break;

                  case "Livia":

                      Console.WriteLine(myDictionary[name]);

                      break;

                  case "Paul":

                      Console.WriteLine(myDictionary[name]);

                      break;

                  default:

                      Console.WriteLine("The name does not exist in the database"); 

                      break;

                } 

            } while (true);

        }

                //Console.WriteLine(myDictionary["Jenny"]); // -> 34

            }

        public interface IList : System.Collections.ICollection 

        {}

    }

​

​