public static void Main()
double[] doubles = { 1.7, 2.3, 1.9, 4.1, 2.9 };
var sortedDoubles = doubles.OrderBy(n => n);
var doublesArray = sortedDoubles.ToArray();
Console.WriteLine("Every other double from highest to lowest:");
for (int d = 0; d < doublesArray.Length; d += 2)
Console.WriteLine(doublesArray[d]);