#3ModifyBiAtCurrPosition

static void Main()
        {
            Console.WriteLine("Enter a number to change a current bit of its binary code.");
            int n = int.Parse(Console.ReadLine());
            Console.WriteLine("Which bit position you'd like to change?");
            int p = int.Parse(Console.ReadLine());
            Console.WriteLine("What value would you like the bit at pos {0} to hold?\nChoose between 0 and 1", p);
            int v = int.Parse(Console.ReadLine());
            Console.WriteLine("Number in binary: {0}", Convert.ToString(n, 2).PadLeft(16, '0'));
            switch (v)
            {
                case 0:
                    {
                        int mask = ~(1 << p);
                        int result = mask & n;
                        Console.WriteLine("Result in decimal: {0}", result);
                        Console.WriteLine("Result in binary: {0}", Convert.ToString(result, 2).PadLeft(16, '0'));
                        break;
                    }
                case 1:
                    {
                        int mask = 1 << p;
                        int result = mask | n;
                        Console.WriteLine("Result in decimal: {0}", result);
                        Console.WriteLine("Result in binary: {0}", Convert.ToString(result, 2).PadLeft(16, '0'));
                        break;
                    }
                default:
                    {
                        Console.WriteLine("Wrong input!");
                        break;
                    }
            }
        }