From 7ed7e0cd2b1fbf60e546b8141bb77e6dbf42fc7f Mon Sep 17 00:00:00 2001
From: Greg Hendershott <greghendershott@gmail.com>
Date: Tue, 2 Jul 2013 14:16:01 -0400
Subject: [PATCH] Add minus1

---
 main.rkt | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/main.rkt b/main.rkt
index 62b23fb..9106fcd 100644
--- a/main.rkt
+++ b/main.rkt
@@ -3,6 +3,10 @@
 (define (plus1 x)
   (add1 x))
 
+(define (minus1 x)
+  (sub1 x))
+
 (module+ test
   (require rackunit)
-  (check-equal? (plus1 1) 2))
+  (check-equal? (plus1 1) 2)
+  (check-equal? (minus1 1) 0))