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();
}
