using System;

class Myqueue<T>

{

    int capacity;

   T[] queue;

   int rear,front; 

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   public Myqueue(int MaxElements)

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   {

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       capacity = MaxElements;

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       queue = new T[capacity];

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       rear=-1;

       front=-1;

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       //initialize top with -1

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   }

    public int enqueue(T Element)

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   {

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       //Check Overflow

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       if (rear == capacity - 1)

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       {

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           // return -1 if over flow is there

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           return -1;

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       }

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       else

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       {

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           // insert elementt into stack

          if(rear==-1)

            {

            rear=0;

            front=0;

            }

           rear = rear + 1;

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           queue[rear] = Element;

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       }

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       return 0;

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   }

    public T dequeue()

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   {

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       T RemovedElement;

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       T temp = default(T);

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       //check Underflow

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       if(front>=0)

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       {

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             front = front+1;

             RemovedElement = queue[front];

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             return RemovedElement;

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       }

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       return temp;

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   }

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    public T peep(int position)

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   {

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       T temp = default(T);

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       //check if Position is Valid or not

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       if (position < rear && position >= front)

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       {

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            return queue[position];

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        }

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       return temp;

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   }

     public T[] GetAllStackElements()

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   {

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       T[] Elements = new T[rear+1];

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       Array.Copy(queue,front+1,Elements,0,rear+1-front);

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       return Elements;

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   }

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}

public class stat{

  public static void Main()

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{

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    int capacity;

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   Console.WriteLine("Enter Capacity of queue :");

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   capacity = int.Parse(Console.ReadLine());

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   Myqueue<string> qq = new Myqueue<string>(10);

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   while (true)

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   {

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       Console.WriteLine("1.enqueue");

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       Console.WriteLine("2.dequeue");

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       Console.WriteLine("3.Peep");

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       Console.WriteLine("4.Print queue Elements:");

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       Console.WriteLine("5.Exit");

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       Console.WriteLine("Eneter your Choice :");

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       int choice = int.Parse(Console.ReadLine());

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       switch (choice)

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       {

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             case 1:

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             {

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                   Console.WriteLine("Enter String to enqueue :");

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                   string temp = Console.ReadLine();

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                   int result = qq.enqueue(temp);

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                   if ( result != -1)

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                   {

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                        Console.WriteLine("Element enqueued !");

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                   }

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                   else

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                   {

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                        Console.WriteLine("queue Overflow !");

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                   }

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                   break;

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             }

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             case 2:

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             {

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                    string Result = qq.dequeue();

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                     if(Result != null)

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                     {

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                        Console.WriteLine("Delete Element :"+Result);

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                     }

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                     else

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                     {

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                        Console.WriteLine("queue Underflow !");

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                     }

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                     break;

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             }

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             case 3:

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             {

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                     Console.WriteLine("Enter Position of Element to dequeue:");

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                     int Position = int.Parse(Console.ReadLine());

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                     string Result = qq.peep(Position);

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                     if(Result != null)

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                     {

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                        Console.WriteLine("Element at Position"+Position+ " is "+Result);

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                     }

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                     else

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                     {

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                        Console.WriteLine("Entered Element is Out of queue Range ");

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                     }

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                     break;

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             }

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             case 4:

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             {

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                    string[] Elements = qq.GetAllStackElements();

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                   Console.WriteLine("**************queue Content **************");

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                   foreach (string str in Elements)

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                   {

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                        Console.WriteLine(str);

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                   }

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                   break;

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             }

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             case 5:

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             {

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                    System.Diagnostics.Process.GetCurrentProcess().Kill();

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                    break;

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             }

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             default:

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             {

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                    Console.WriteLine("You have Entered Wrong Choice ");

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                    break;

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             }

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        }

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    }

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}}

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