C# Code

using System;
class Lb
{
    static void Main(string[] args)
    {
        while (true)
        {
            Console.Write ("Enter number:");
            String s=Console.ReadLine(); uint x;
            try
            {
                x = uint.Parse(s);
            }
            catch (OverflowException e)
            {
                Console.WriteLine("Number is too big");
                continue; 
            }
            catch (Exception e)
            {
                Console.WriteLine("Error type of enter");
                continue;
            }
            double l = Math.Log(x, 2);
            Console.WriteLine("Lb({0}={1}", x, l);
        }
    }
}