From 3fca1475f6afffcb7cdddaec7dbdc2ea0b521b67 Mon Sep 17 00:00:00 2001
From: Fung Cheok Yin <61836418+E7-87-83@users.noreply.github.com>
Date: Sun, 26 Jul 2020 18:20:28 +0800
Subject: Add files via upload

---
 ch-2.lsp | 15 +++++++++++++++
 1 file changed, 15 insertions(+)
 create mode 100644 ch-2.lsp

diff --git a/ch-2.lsp b/ch-2.lsp
new file mode 100644
index 0000000000..8cce700264
--- /dev/null
+++ b/ch-2.lsp
@@ -0,0 +1,15 @@
+(setf n 4)
+(setf a '(0 1))
+(setf m (- n 1))
+
+(loop for i from 1 upto m do
+  (setf 2power (expt 2 i))
+  (defun add2pow (terms) (+ 2power terms))
+  (setf b (reverse a))
+  (setf b (mapcar #'add2pow b))
+  (setf a (append a b))
+)
+
+;;now the variable a stores the n-bit gray code sequence
+
+a 
-- 
cgit