using System;

public class Program

{

        static void Main(string[] args)

        {

            uint a = 0b_0001;

​

            uint b = new Program().Reverse(a, 4);

            Console.WriteLine(b);

        }

​

        public uint Reverse(uint a, int length)

        {

            uint b = 0b_0;

            for (int i = 0; i < length; i++)

            {

                b = (b << 1) | (a & 0b_1);

                a = a >> 1;

            }

            return b;

        }

}