3.ModifyBitAtGivenPosition

using System;

class ModifyABitAtGivenPosition
{
    static void Main ()
    {
        Console.Write("Please, enter a whole integer non-negative number, N = ");
        string numberStr = Console.ReadLine();
        int numberN = int.Parse(numberStr);
        Console.Write("Enter 0 or 1, for a bit value V = ");
        numberStr = Console.ReadLine();
        int makeBitValue = int.Parse(numberStr);
        Console.Write("Enter other whole non-negative number in the range [0 ... 31], P = ");
        numberStr = Console.ReadLine();
        int numberP = int.Parse(numberStr);
        int bitMask = 1 << numberP;
        int numberAfterBitModify;
        if (makeBitValue == 0)
        {
            numberAfterBitModify = numberN & (~bitMask);
        }
        else
        {
            if ((numberN & bitMask) == 0)
            {
                numberAfterBitModify = numberN | bitMask;
            }
            else
            {
                numberAfterBitModify = numberN;
            }
        }
        Console.WriteLine("After modifing Bit at P-position, Number have change to NEW NUMBER = "
            + numberAfterBitModify);
        Console.ReadLine();
    }
}