static void Main(string[] args) { const double PI = Math.PI; var daysType = typeof(Days); Console.WriteLine("PI Type: " + PI.GetType()); Console.WriteLine("Circumference: " + (PI * 3)); Console.WriteLine("\nFirst Name:" + Days.Sat); Console.WriteLine("\n1st Index: " + (int)Days.Sat); string name = Enum.GetName(daysType, 1); Console.WriteLine("\n2nd Index: " + name); bool flag = Enum.IsDefined(daysType, "Mon"); Console.WriteLine("Contains Mon?: " + flag); Console.ReadKey(); }