Exercises for Touretzky’s “COMMON LISP: A Gentle Introduction to Symbolic Computation”

A repository containing exercises and solutions for the book: Common Lisp: A Gentle Introduction

For each exercise (where possible) I have provided an assertion to test against.

Executing exercises

1. Open the exercise lisp file in emacs.
2. M-x slime (install Slime addon if missing)
3. Add the function required to make the assertion pass.
4. Ctrl+Alt+x your defun.
5. Ctrl+Alt+x the assertion;
   • if it has completed successfully NIL will appear in the bottom bar of emacs
   • if it has failed, a error will appear in your repl

Loading sdraw

Sdraw will render your objects using similar notation to what is in the book. To use it in your repl perform the following steps:

1. In your repl, execute (load "sdraw.lisp")
2. You can now call sdraw: (sdraw:sdraw (list 1 2 3))
3. You should observe something like the following in your REPL:

   [*|*]--->[*|*]--->[*|*]--->NIL
   |        |        |
   v        v        v
   1        2        3
       

Loading dtrace

Dtrace will trace your function calls more thoroughly than trace can. To use dtrace in your repl perform the following steps.

1. In your repl, execute (load "dtrace.lisp")
2. You can now call dtrace:

   (defun my-add (a b)
     (+ a b))
   (dtrace my-add)
   (my-add 1 2) 
       

3. You should observe something like the following in your REPL

   ----Enter MY-ADD
   |     Arg-1 = 1
   |     Arg-2 = 2
   \--MY-ADD returned 3
   3