diff -r c45d3cd9a749 -r dcaab8068baa progs/lecture1.scala
--- a/progs/lecture1.scala	Sat Nov 04 16:17:19 2017 +0000
+++ b/progs/lecture1.scala	Sun Nov 05 12:02:09 2017 +0000
@@ -13,6 +13,28 @@
 // (you cannot reassign values: z = 9 will give an error)
 
 
+
+// Hello World
+//=============
+
+// an example of a stand-alone scala file;
+// in the coursework students must submit 
+// plain scala "work-sheets"
+
+object Hello extends App { 
+  println("hello world")
+}
+
+// can be called with
+//
+// $> scalac hello-world.scala
+// $> scala Hello
+//
+// $> java -cp /usr/local/src/scala/lib/scala-library.jar:. Hello
+
+
+
+
 // Collections
 //=============
 List(1,2,3,1)
@@ -126,24 +148,6 @@
 val t = (4,1,2,3)
 t._4
 
-// Hello World
-//=============
-
-// an example of a stand-alone scala file;
-// in the coursework students must submit 
-// plain scala "work-sheets"
-
-object Hello extends App { 
-  println("hello world")
-}
-
-// can be called with
-//
-// $> scalac hello-world.scala
-// $> scala Hello
-//
-// $> java -cp /usr/local/src/scala/lib/scala-library.jar:. Hello
-
 
 // Function Definitions
 //======================