Installing DrRacket on Your Computer

1. Download the latest version of DrRacket to your Desktop. Click on the installer file and accept the installation defaults.

2. Start DrRacket, and under the Language menu select Choose Language, then click on Show Details to expand the dialog window.

3. Select Other Languages, click on Pretty Big, then un-check the setting Disallow redefinition of initial bindings. Also make sure that the Output Style setting is set to write. Then click OK.

   

4. Click Run in the upper right corner of the DrRacket window. You should see something like this in the lower half of the window:

   Welcome to DrRacket, version 8.6 [cs].
   Language: Pretty Big [custom]; memory limit: 128 MB.
   >
   

5. If DrRacket starts up with a black background instead of a white background, change the color scheme by going to DrRacket → Preferences → Colors and clicking on Classic. Check the box labeled Revert to default colors. Then click OK.

6. Remove the installer file from your Desktop.

Installing the Concabs Graphics Library

1. • On a Mac, download the file mac-concabs.zip to your Desktop, and double-click on it, which will create a folder named concabs.

   • On Windows, download the file win-concabs.zip and open it. Inside you should see a folder called concabs.

2. Locate the DrRacket folder on your hard drive. On a Mac, it should be named Racket v8.6 in your Applications folder; on Windows, it should be under C:\Program Files\Racket. Inside this folder, you should see a subfolder called collects. Drag the concabs folder to the collects folder. You can then delete the zip file you downloaded in step 1, which is no longer needed.

3. To check if everything works, start DrRacket and type the following line in the upper part of the DrRacket window, then click Run:

   (require (lib "fungraph.ss" "concabs"))
   

   Then type test-bb at the DrRacket prompt in the lower part of the window and hit Return. You should see a black triangle, as shown below. The other graphical building blocks are called rcross-bb, corner-bb, bitw-bb, and nova-bb. To use the building blocks in a program, you must include the require line at the top of your program file.