3.15 Bits Exchange

// Write a program that exchanges bits 3, 4 and 5 with bits 24, 25 and 26 of given 32-bit unsigned integer.

namespace _15.BitsExchange
{
    using System;

    public class BitsExchange
    {
        public static void Main(string[] args)
        {
            checked
            {
                Console.Write("Enter a whole 32-bits non-negative number: ");
                uint num = uint.Parse(Console.ReadLine());

                // First checking bit values on given positions. If founded bit values is equals, the exchange does not necessary and given number is output result.
                long bitValueOn543 = ((long)num >> 3) & 7;
                long bitValueOn262524 = ((long)num >> 24) & 7;
                uint resultNum = num;
                if (bitValueOn543 != bitValueOn262524)
                {
                    // Now must nullifying bits on given positions:
                    long bitMask543 = bitValueOn543 << 3;
                    resultNum = (uint)(num ^ bitMask543);
                    long bitMask262524 = bitValueOn262524 << 24;
                    resultNum ^= (uint)bitMask262524;

                    // Exchages the bits on positions 3, 4 and 5:
                    long bitMaskExchange543 = bitValueOn262524 << 3;
                    resultNum |= (uint)bitMaskExchange543;

                    // Exchanges the bits on positions 24, 25 and 26:
                    long bitMaskExchange262524 = bitValueOn543 << 24;
                    resultNum |= (uint)bitMaskExchange262524;
                }

                Console.WriteLine("The Number After Bits Exchange is: {0} !", resultNum);
            }
        }
    }
}