using System;

using System.Collections;

namespace stackProject

{

     class Program

    {

       public static void Main(string[] args)

        {

            Stack s = new Stack();

            //PUSHING ELEMENTS INTO STACK//

            s.Push("new stack");

            s.Push('A');

            s.Push(25000);

            s.Push('B');

            //NOW PRINTING ELEMENTS FROM STACK BUT PRINTS ACCORFINF L-I-F-O//

            Console.WriteLine("ELEMENTS IN STACK ARE : ");

            foreach(object o in s)

            {

                Console.WriteLine(o);

            }

            //NOW REMOVING ELEMENTS using pop removes only top element from stack //

            s.Pop();

            //now top element is remmoved//

            Console.WriteLine("now top element is removed using pop and elements of stack are : ");

            foreach (object o in s)

            {

                Console.WriteLine(o);

            }

            //TO CHECK WHETHER AN ELEMENT IS CONTAINED IN STACK//

            Console.WriteLine("CHECKING WHETHER AN ELEMENT IS PRESENT IN STACK");

            Console.WriteLine(s.Contains("new stack"));

            //using peek method returns top element withoiut removing it//

            Console.WriteLine("GETTING TOP ELEMENT THROUGH PEEK()");

            Console.WriteLine(s.Peek());

            //returning all elements of stack to array//

            object[] obj = new object[5];

             obj = s.ToArray();

            Console.WriteLine("after copying all elements of stack to array so elements of array are:");

            foreach(object i in obj)

            {

                Console.Write(i+" ");

            }

            //deleting entire stack using clear()//

            s.Clear();

            Console.WriteLine("\nNOW WE CLEARED STACK SO ITS EMPTY");

            foreach (object i in s)

            {

                Console.Write(i + " ");

            }

            Console.WriteLine("giving input at runtime from user to store in stack");

            s.Push(Console.ReadLine());

            Console.WriteLine("Now displaying element entered by user from stack");

            foreach (object i in s)

            {

                Console.Write(i + " ");

            }

            Console.Read();

        }

    }

}

​