The information here corresponds with versions 370-372 of DrScheme, which are no longer current. See the parent web page for information on the current version.
Choose Language...option. For compatibility with Concrete Abstractions, select to the "Textual" language listed under the "PLT" heading.
By default, this language setting causes DrScheme to be "case
sensitive." For example, the symbols
Barbara are treated as distinct, contradicting Exercise
13.18. If you consider compatibility in this regard to be important,
you can use the
Show Details button within the
Change Language... panel and then turn case sensitivity off.
Note for instructors: These language settings can also be done once for all users with a site-specific preferences file, so that each user doesn't need to do it. Search in the Help Desk for "site-specific" for information on how to set this up.
The libraries can either be installed in your own user-specific storage area or in an area that is shared by all users of your computer system. For the user-specific version, download concabs.plt. For the shared version, download concabs-all-users.plt. On some systems, such as Microsoft Windows and Mac OS X, you should then be able to install the libraries by double-clicking the icon for the .plt file you downloaded. (Some web browsers may even offer to open the file for you.) Or, on any system, you can go into DrScheme's File menu and select "Install .plt File...". Then select the .plt file you downloaded.
To use the library for graphical images, your definitions file within DrScheme should start with the line
(require (lib "fungraph.ss" "concabs"))
Bug note: There is a relevant bug in version 370 of DrScheme, which was fixed in version 371. Therefore, we recommend using version 371 or later. If you need to use version 370, then unless you are using a Mac or Windows machine, read about the bug.
In addition to the features described in the textbook (most succinctly in the appendix), there are a few extensions. Descriptions of those extensions and a couple hints regarding usage are in a separate web page.
To use the object-oriented programming system library for chapter 14, your definitions file within DrScheme should start with the line
(require (lib "oops.ss" "concabs"))
We list below the affected names, organized into categories and listed within each category in their order of their appearance within the book:
newlineprocedure to break output into separate lines. Unfortunately, there are two different conventions in use by different Scheme systems. One is to always use
newlineat the start of each line of output, while the other is to always use it at the end of each line. As a result of this lack of standardization, wherever we positioned the uses of
(newline)in our programs would result in output that looked odd on some systems. We've tried in the textbook to make choices that don't look too horrible on any system, with the result that the output tends to look sub-optimal on every system. In particular, there tends to be extra blank lines. If you are working consistently within DrScheme (or any other one system), feel free to remove or reposition
(newline)as necessary to make the output look best.
rcross-bb, are neither pre-defined nor defined within the library. Instead, their definitions are in a separate file.
read-eval-print-loop, which gives a normal Scheme (as opposed to micro-Scheme or mini-Scheme) REPL. Thus, if you fail to execute the definition from the book, you could be fooled by DrScheme's loop into thinking that everything is working fine. To guard against this, be on the lookout for the different prompts; micro-Scheme and mini-Scheme both specifically identify themselves in their prompts.