public static void Main() { Console.WriteLine(File.GetFileExtension("example")); Console.WriteLine(File.GetFileExtension("example.pdf")); Console.WriteLine(File.GetFileExtension("example.new.pdf")); Console.WriteLine(File.GetFileNameWithoutExtension("example")); Console.WriteLine(File.GetFileNameWithoutExtension("example.pdf")); Console.WriteLine(File.GetFileNameWithoutExtension("example.new.pdf")); Console.WriteLine("Distance in the 2D space = {0:f2}", Shape.CalculateDistance2D(new Point2D(1, -2), new Point2D(3, 4))); Console.WriteLine("Distance in the 3D space = {0:f2}", Shape.CalculateDistance3D(new Point3D(5, 2, -1), new Point3D(3, -6, 4))); Shape.Width = 3; Shape.Height = 4; Shape.Depth = 5; Console.WriteLine("Volume = {0:f2}", Shape.CalculateVolume()); Console.WriteLine("Diagonal XYZ = {0:f2}", Shape.CalculateDiagonalXYZ()); Console.WriteLine("Diagonal XY = {0:f2}", Shape.CalculateDiagonalXY()); Console.WriteLine("Diagonal XZ = {0:f2}", Shape.CalculateDiagonalXZ()); Console.WriteLine("Diagonal YZ = {0:f2}", Shape.CalculateDiagonalYZ()); }