Update my answers in ch3

Author: dwayne

ch3/ex1.txt

@@ -1,5 +1,7 @@
+Exercises: Scope
+
 1. Yes, y is in scope for z.
-2. No, h is not in scope for g.
+2. No, h is not in scope for g. h is not even defined.
 3. No, everything needed to execute area is not in scope. The d used to compute
    the radius is not in scope. See ex1.hs.
 4. Yes, everything needed to execute area is in scope. See ex1.hs.

ch3/ex3.txt

@@ -5,7 +5,7 @@ Reading syntax
 a) concat [[1, 2, 3], [4, 5, 6]], is ok
 b) ++ [1, 2, 3] [4, 5, 6] should be (++) [1, 2, 3] [4, 5, 6]
 c) (++) "hello" " world" is ok
-d) ["hello" ++ " world] should be "hello" ++ " world"
+d) ["hello" ++ " world] should be ["hello" ++ " world"]
 e) 4 !! "hello" should be "hello" !! 4
 f) (!!) "hello" 4 is ok
 g) take "4 lovely" should be take 4 "lovely"

ch3/print3broken.hs

@@ -1,5 +1,10 @@
 module Print3Broken where
 
+-- To make it compile
+-- 1. Define greeting at the top-level
+greeting :: String
+greeting ="Yarrrrr"
+
 printSecond :: IO ()
 printSecond = do
   putStrLn greeting -- Not in scope: 'greeting'
@@ -8,4 +13,5 @@ main :: IO ()
 main = do
   putStrLn greeting
   printSecond
-  where greeting = "Yarrrrr"
+  -- 2. This can be commented out
+  -- where greeting = "Yarrrrr"