C# isEven Tower

                                   using System;
                     class Program{static void Main(){int x=0;
                  for(;;){Console.Write("> ");if(!Int32.TryParse(
         Console.ReadLine(),out x))return;Console.WriteLine("{0} is {1}",
   x,IsEvenOrOdd(x)?"even":"odd");}}static bool IsEvenOrOdd(int x,bool e=true){
l:if(x==0)return e;else if(x<0)return IsEvenOrOdd(~x,!e);else{x=x-1;e=!e;goto l;}}}