using System;

using System.Collections.Generic;

public class ListExcercises{

    static void Main(string[] args){

        var List1 = new List<int>(){1,2,3,-1,10,-100};

        List1.Add(5);

        List1.AddRange(9,1,3);

        Console.WriteLine("After adding new element:");

        foreach(var num in List1){

            Console.WriteLine(num);

        }

        Console.WriteLine("Count of the list is :"+List1.Count);

        Console.WriteLine("Index of 1:"+List1.IndexOf(1));

        Console.WriteLine("Clearing 1:"+List1.Remove(1));

        foreach(var num in List1){

            Console.WriteLine(num);

        }

        //if we want to fully clear any particulat element we can use forloop

        Console.WriteLine("After removing all the 3");

        for(int i=0;i<List1.Count;i++){

            if(List1[i]==3){

                List1.Remove(List1[i]);

            }

        }

        foreach(var num in List1){

            Console.WriteLine(num);

        }

        List1.Sort();

        Console.WriteLine("After sorting");

        foreach(var num in List1){

            Console.WriteLine(num);

        }

    }

}