Computer Programs, Information, Data

DrScheme looks like this:

Beware! If your window does not say Language: Beginner in the lower window like the above picture, then see the IMPORTANT note in Preparing DrScheme.

DrScheme's bottom area is called the interactions window. It evaluates Scheme expressions. The next section, Numbers and Arithmetic, demonstrates how to type Scheme expressions in the interactions window.

The top area, the definitions window, is for defining new programs. We'll explain how to use this window later, in Variables and Programs.