using System;

    public class Program

    {

        public static void Main()

        {

​

​

            // Can I use my VS to code? Coding here is kind of difficult..

            //I have used VS for coding & testing and there was no error thrown. In this application it is throwing exceptions.

            try

            {

                string input = Console.ReadLine();

                long inputValue = 0;

​

                long.TryParse(input, out inputValue);

                //tried to debug so commented the below code and added these 3 line code above.

                //long.TryParse(Console.ReadLine(), out long inputValue);

​

                if (inputValue > 0)

                {

                    Console.WriteLine(ReturnSize(inputValue));

                }

​

                if (input.Length > 0 && inputValue == 0)

                {

                    Console.WriteLine("Please enter a valid/numeric input eg:1234567890 ");

                }

​

            }

​

            catch (Exception ex)

            {

                //Console.WriteLine("Unhandled exception is thrown");

                Console.WriteLine(ex.Message);

            }

            /*

    125 = 125  bytes

    1040 = 1.01 kb

    9999999 = 9.53 mb

​

    1024 bytes = 1 KB

    1024 KB = 1 MB

    1024 MB = 1 GB      

            */

​

            //Console.WriteLine("Hello World");

        }

​

        public static string ReturnSize(long inputValue)

        {

            int counter = 0;

            string[] size = { "b", "Kb", "Mb", "Gb" };

            double result = inputValue;

​

            for (int incrementer = 0; incrementer <= size.Length - 1; incrementer++)

            {

                //checking for the size max limit

                if (result >= 1024)

                {

                    result = Math.Round(inputValue / Convert.ToDouble(1024), 2);

                    counter++;

                }

                else

                    break;

            }

​

​

            if (counter >= size.Length)

            {

                return result.ToString() + size[size.Length - 1];

            }

            else

                return result.ToString() + size[counter];

        }

​

    }

​