ResizableArray

namespace ResizablArray
{
    using System;
    using System.Linq;
    using System.Text;

    public class ResizablArray
    {
        public static int currentSizeOfArray = 4;
        public static int currIndexOfElement = 0;
        public static int[] array = new int[4];

        public static void Main()
        {
            string inputLine = ReadInputFromConsole();
            while (inputLine != "end")
            {
                string[] commandInfo = inputLine.Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);

                switch (commandInfo[0])
                {
                    case "push":
                        int number = int.Parse(commandInfo[1]);

                        PushElementInTheEndOfTheArray(number);
                        break;

                    case "pop":
                        RemoveElementAtIndex(array.Length - 1);
                        break;

                    case "removeat":
                        int index = int.Parse(commandInfo[1]);

                        RemoveElementAtIndex(index);
                        break;

                    case "clear":
                        ClearTheArray();
                        break;

                    default:
                        break;
                }

                inputLine = ReadInputFromConsole();
            }

            PrintTheElements();
        }

        private static void PrintTheElements()
        {
            StringBuilder result = new StringBuilder();
            if (currIndexOfElement == 0)
            {
                result.Append("empty array");

                goto Print;
            }

            for (int currElement = 0; currElement < currIndexOfElement; currElement++)
            {
                result.Append(array[currElement]);

                if (currElement + 1 != currIndexOfElement)
                {
                    result.Append(" ");
                }
            }

            Print:
            Console.WriteLine(result.ToString());
        }

        private static void ClearTheArray()
        {
            currentSizeOfArray = 4;
            currIndexOfElement = 0;

            array = new int[currentSizeOfArray];
        }

        private static void RemoveElementAtIndex(int index)
        {
            if (array.Length == 0 || index < 0 || index >= array.Length)
            {
                return;
            }

            for (int currElement = index; currElement < array.Length - 1; currElement++)
            {
                array[currElement] = array[currElement + 1];
            }

            array[array.Length - 1] = 0;

            currIndexOfElement--;
        }

        private static void PushElementInTheEndOfTheArray(int numberToAdd)
        {
            if (currIndexOfElement == array.Length)
            {
                DoubleUpTheSizeOfTheArray();
            }

            array[currIndexOfElement] = numberToAdd;

            currIndexOfElement++;
        }

        private static void DoubleUpTheSizeOfTheArray()
        {
            int[] arrayHolder = array.ToArray();

            currentSizeOfArray *= 2;
            array = new int[currentSizeOfArray];

            for (int currElement = 0; currElement < arrayHolder.Length; currElement++)
            {
                array[currElement] = arrayHolder[currElement];
            }
        }

        private static string ReadInputFromConsole()
        {
            return Console.ReadLine().Trim().ToLower();
        }
    }
}