static void Main() { // Namespace: Files, Class: File 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")); // Namespace: Figure, Class: Cube Console.WriteLine("Distance in the 2D space = {0:f2}", Cube.Distance(1, -2, 3, 4)); Console.WriteLine("Distance in the 3D space = {0:f2}", Cube.Distance(5, 2, -1, 3, -6, 4)); Cube.Width = 3; Cube.Height = 4; Cube.Depth = 5; Console.WriteLine("Volume = {0:f2}", Cube.CalcVolume()); Console.WriteLine("Diagonal XYZ = {0:f2}", Cube.CalcDiagonalXYZ()); Console.WriteLine("Diagonal XY = {0:f2}", Cube.CalcDiagonalXY()); Console.WriteLine("Diagonal XZ = {0:f2}", Cube.CalcDiagonalXZ()); Console.WriteLine("Diagonal YZ = {0:f2}", Cube.CalcDiagonalYZ()); }