using System;

using System.Collections.Generic;

​

public class Program

{

    public class customStack<T>

    {

        static public T[] myStack;

        static int top = 0;

        static customStack()

        {

            myStack = new T[10];

        }

​

        public customStack(T d)

        {

            myStack[top] = d;

            top++;

        }

​

        public void adder(T d)

        {

            myStack[top] = d;

            top++;

        }

​

        public IEnumerator<T> GetEnumerator()

        {

            int t = 0;

            while (t != 10)

            {

                yield return myStack[t];

                t++;

            }

        }

    }

​

    public static void Main()

    {

        var someStack = new customStack<int>(20);

        someStack.adder(30);

        someStack.adder(40);

        someStack.adder(50);

        someStack.adder(60);

        foreach (var x in someStack)

        {

            Console.WriteLine(x);

        }

​

        var someAnotherStack = new customStack<string>("Hello");

        someAnotherStack.adder("yo");

        someAnotherStack.adder("bro");

        someAnotherStack.adder("qwert");

        foreach (var x in someAnotherStack)

        {

            Console.WriteLine(x);

        }

    }

}