A file is a record within the storage device that holds data. Files are organized into hierarchies using directories. A directory is a location that can contain files as well as other directories.

- use conditional processing to control the data set or sets to which an observation is written - control which variables are written to an output data set during a DATA step - control which variables ...

The class Keyboard.java is a robust version for the set of basic methods that you would want for keyboard input. The class hides all of these details from new users. On the other hand, in order to ...