SICP Exercises

Root directories are the section in the text, filenames are exercise number. Plain text responses in .txt files, scheme source in .ss files (tested with PLT Scheme), clojure source in .clj files (tested with Clojure v20081217).

Also included are exerciese from the Instructor's Manual, prefixed with an 'M'.

Support Files

I've included clojure.jar, v20081217, and a simple wrapper bash script that will open up the Clojure REPL.

Notes

There are some special form differences between the scheme presented in SICP and Clojure. I'm documenting them here as I go along.

Scheme                                Clojure

(define a 3)                          (def a 3)

(cond ((= a 4) 6)                     (cond (= a 4) 6
      ((= b 4) (+ 6 7 a))                   (= b 4) (+ 6 7 a)
      (else 25))                            :else 25)

(define (a-plus-abs-b a b)            (defn a-plus-abs-b [a b]
  ((if (> b 0) + -) a b))               ((if (> b 0) + -) a b))

                                      ; The JVM doesn't automatically support
                                      ; tail-call optimization, so Clojure
                                      ; provides a keyword to hint it
(defn sqrt-iter [guess x]             (defn sqrt-iter [guess x]
  (if (good-enough? guess x)            (if (good-enough? guess x)
      guess                                 guess
      (sqrt-iter (improve guess x)          (recur (improve guess x)
                 x)))                              x)))