using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        Queue<int>  myque = new Queue<int>();

        //insert elements

        myque.Enqueue(1);

        myque.Enqueue(2);

        myque.Enqueue(3);

        myque.Enqueue(4);

        myque.Enqueue(5);

        //count the number of elements

        Console.WriteLine("Number of elements in the queue: {0}", myque.Count);

        //display elements of myque

        Console.WriteLine("\nDisplaying elements of queue:");

        foreach(int item in myque)

        {

            Console.WriteLine(item);

        }

        //display first element in the queue

        Console.WriteLine("\nFirst element of myque is: {0}", myque.Peek());

        myque.Dequeue();

        Console.WriteLine("\nSecond oldest element of myque is after dequeue: {0}", myque.Peek());

        Console.WriteLine("\nNumber of elements in the queue after dequeing first element: {0}", myque.Count);

        Console.WriteLine("\nDisplaying elements of queue after dequeue:");

        foreach(int item in myque)

        {

            Console.WriteLine(item);

        }

        Console.WriteLine("\nDoes myque contains 1: {0}", myque.Contains(1));

        //copy queue elements to array

        Console.WriteLine("\nCreate array then copy element of myque:");

        int[] myarr = new int[10];

        myque.CopyTo(myarr,0);

        Console.WriteLine("\nElements of array after CopyTo Method:");

        foreach(int item in myarr)

        {

            Console.WriteLine(item);

        }

    }

}