diff --git a/sources/zweic/Printer.scala b/sources/zweic/Printer.scala
index f76db90..3425ead 100755
--- a/sources/zweic/Printer.scala
+++ b/sources/zweic/Printer.scala
@@ -27,24 +27,19 @@
    */
   private var level = 0;
 
-  def joinprint(args:List[Tree], sep: String):Printer = args match {
+  def joinprint(args:List[Tree], sep: => Printer):Printer = args match {
     case h :: Nil => 
       print(h);      
     case h :: t => 
-      print(h).print(sep);
-      joinprint(t, sep);      
+      print(h);
+      sep;
+      joinprint(t, sep);
     case Nil =>
       print("");
   }
 
-  def joinprint(args:List[Tree]):Printer = args match {
-    case h :: Nil => 
-      print(h);      
-    case h :: t => 
-      print(h).println;
-      joinprint(t);      
-    case Nil =>
-      print("");
+  def joinprint(args:List[Tree], sep:String):Printer = {
+    joinprint(args, print(sep));
   }
 
   /**
@@ -56,9 +51,7 @@
    
     tree match {
     case Program(decls, main) =>
-      for (val d <- decls) {
-        print(d).println;
-      }
+      joinprint(decls, println).println;
       print(main).println;
       
     //
@@ -72,7 +65,7 @@
 	case _ => null;
       }
       print(" {").indent.println;
-    joinprint(members);
+      joinprint(members, println.println);
       undent.println.print("}").println;
 
     case FieldDecl(formal) =>
@@ -105,7 +98,7 @@
 
     case While(cond, stats) =>
       print("while (").print(cond).print(") {");
-      indent.println.joinprint(stats).undent.println.print("}");
+      indent.println.joinprint(stats, println).undent.println.print("}");
 
     case Var(varname, vartype, init) =>
       print(vartype).print(" ").print(varname).print(" = ").