Update hello and ex1.txt from ch13

Author: dwayne

ch13/ex1.txt

@@ -1,3 +1,5 @@
+Intermission: Check your understanding
+
 1. forever and when
 
 2. Data.Bits and Database.Blacktip.Types
@@ -10,6 +12,6 @@ a) MV  == Control.Concurrent.MVar
    FPC == Filesystem.Path.CurrentOS
    CC  == Control.Concurrent
 
-b) FS.writeFile refers to the Filesystem's writeFile function
+b) FS.writeFile refers to the Filesystem module, writeFile function
 
 c) forever came from the Control.Monad library

ch13/hello/exe/Main.hs

@@ -1,8 +1,10 @@
 module Main where
 
+import System.IO
+
 import DogsRule
 import Hello
-import System.IO
+
 
 main :: IO ()
 main = do

ch13/hello/hello.cabal

@@ -23,5 +23,5 @@ library
   hs-source-dirs:      src
   exposed-modules:     DogsRule
                      , Hello
-  build-depends:       base >= 4.7 && < 5
   default-language:    Haskell2010
+  build-depends:       base >= 4.7 && < 5

ch13/hello/src/DogsRule.hs

@@ -1,4 +1,7 @@
-module DogsRule ( dogs ) where
+module DogsRule
+  ( dogs )
+  where
+
 
 dogs :: IO ()
 dogs = do

ch13/hello/src/Hello.hs

@@ -1,4 +1,7 @@
-module Hello ( sayHello ) where
+module Hello
+  ( sayHello )
+  where
+
 
 sayHello :: String -> IO ()
-sayHello name = putStrLn $ "Hi " ++ name ++ "!"
+sayHello name = putStrLn ("Hi " ++ name ++ "!")