using System;

public class Program

{

    public static void Main()

    {

        string [] colours = new string[6];

​

        int tail = -1;

        int head = 0;

        int maxElements = 6;

        while(true) //enQueueing - adding things to a queue

        {

            Console.WriteLine("Do you want to add a colour? y/n to proceed");

            string yn = Console.ReadLine();

            if(yn == "y")

            {

                Console.WriteLine("ENTER A COLOUR");

                string item = Console.ReadLine();

                if(tail == maxElements -1)

                {

                    Console.WriteLine("QUEUE FULL!");

                    break;

                }   

                else

                {

                    tail = tail + 1;

                    colours[tail] = item;

                }

            }

            else

            {

            Console.WriteLine(string.Join(",", colours));

            break;  

            }

        }

        while(true) //deQueuing - removing items from the front of the queue

        {

            if(head == (tail + 1))

            {

                Console.WriteLine("No colours");

                break;

            }

            else

            {

                Console.WriteLine("Do you want to remove a colour? y/n to proceed");

                string yn = Console.ReadLine();

                if(yn == "y")

                {

                    Console.WriteLine(colours[head]);

                    head = head + 1;

                }

                else

                {

                    break;

                }

            }

        }

    }

}