Fix div-by-0, some javadoc

higher level parsers can return null, but their return is ignored anycase.
div-by-0 is defined to be 0, backported to ch2,3,4,5

1 files changed, 8 insertions, 7 deletions

diff --git a/chapter05/src/test/java/com/seaofnodes/simple/Chapter05Test.java b/chapter05/src/test/java/com/seaofnodes/simple/Chapter05Test.java
index bb95dc18..ea65900f 100644
--- a/chapter05/src/test/java/com/seaofnodes/simple/Chapter05Test.java
+++ b/chapter05/src/test/java/com/seaofnodes/simple/Chapter05Test.java
@@ -69,7 +69,13 @@ return c;
         StopNode stop = parser.parse();
         assertEquals("return Phi(Region33,Phi(Region21,2,3),Phi(Region31,4,5));", stop.toString());
     }
-
+    
+    @Test
+    public void testChapter5True() {
+      StopNode stop = new Parser("return true;").parse();
+      assertEquals("return 1;",stop.toString());
+    }
+    
     @Test
     public void testChapter5HalfDef() {
         try { 
@@ -91,12 +97,6 @@ return c;
     }
     
     @Test
-    public void testChapter5True() {
-      StopNode stop = new Parser("return true;").parse();
-      assertEquals("return 1;",stop.toString());
-    }
-    
-    @Test
     public void testChapter5BadNum() {
         try { 
             new Parser("return 1-;").parse();
@@ -135,6 +135,7 @@ return c;
             assertEquals("Syntax error, expected =: (",e.getMessage());
         }
     }
+    
     @Test
     public void testChapter4Peephole() {
         Parser parser = new Parser("return 1+arg+2; #showGraph;");