From: Ramakrishnan Muthukrishnan <vu3rdd@gmail.com>
Date: Wed, 15 Sep 2010 18:22:05 +0000 (+0530)
Subject: solution to 2.67
X-Git-Url: https://git.rkrishnan.org/listings/vdrive//%22news.html/%22?a=commitdiff_plain;h=91f1f1e211d8d46eb6b5933f16fc805fbaa54607;p=sicp.git

solution to 2.67
---

diff --git a/src/sicp/ex2_67.rkt b/src/sicp/ex2_67.rkt
new file mode 100644
index 0000000..a740f05
--- /dev/null
+++ b/src/sicp/ex2_67.rkt
@@ -0,0 +1,15 @@
+#lang racket
+
+(require "ch2_3.rkt"
+         rackunit)
+
+;; Exercise 2.67.  Define an encoding tree and a sample message:
+(define sample-tree
+  (make-code-tree (make-leaf 'A 4)
+                  (make-code-tree 
+                   (make-leaf 'B 2)
+                   (make-code-tree (make-leaf 'D 1)
+                                   (make-leaf 'C 1)))))
+(define sample-message '(0 1 1 0 0 1 0 1 0 1 1 1 0))
+
+(check equal? (decode sample-message sample-tree) '(A D A B B C A))
\ No newline at end of file