Make full_adder simpler.

diff --git a/Adders.hs b/Adders.hs
index 03f04101ff9c72612bea6e4ab5030bc8b9fc2eda..71d38dc4197293febaaca3917998fc8cf94841e2 100644 (file)
--- a/Adders.hs
+++ b/Adders.hs
@@ -42,8 +42,9 @@ half_adder (a, b) =
 full_adder :: (Bit, Bit, Bit) -> (Bit, Bit)
 full_adder (a, b, cin) = (s, c)
   where
-    s = a `hwxor` b `hwxor` cin
-    c = a `hwand` b `hwor` (cin `hwand` (a `hwxor` b))
+    x = a `hwxor` b
+    s = x `hwxor` cin
+    c = a `hwand` b `hwor` (cin `hwand` x)
 
 -- Four bit adder
 -- Explicit version