public static void Main()
Console.WriteLine("enter a number");
num = int.Parse(Console.ReadLine());
Console.WriteLine("sum of houses: {0}", (num % 10) + (num / 100) + (num / 10 % 10));
Console.WriteLine("the next num: {0}", num + 1);
Console.WriteLine("num flipped: {0}{1}{2}", (num % 10), (num / 10 % 10), (num / 100));