diff --git a/sources/zweic/Printer.scala b/sources/zweic/Printer.scala
index 6d68ab9..1a32f82 100755
--- a/sources/zweic/Printer.scala
+++ b/sources/zweic/Printer.scala
@@ -27,6 +27,15 @@
    */
   private var level = 0;
 
+  def joinprint(args:List[Tree], sep:String):Printer = args match {
+    case h :: Nil => 
+      print(h);      
+    case h :: t => 
+      print(h).print(sep);    
+      joinprint(t, sep);      
+    case Nil =>
+      print("---");
+  }
   /**
    * Prints a tree node.
    */
@@ -59,9 +68,7 @@
 
     case MethodDef(name, args, returntype, expression) =>
       print(returntype).print(" ").print(name).print(" (");
-      for (val a <- args) {	
-	print(a).print(", ");
-      }
+      joinprint(args, ", ");
       print(") {").println;
       indent;
       print(expression).println;
@@ -87,12 +94,13 @@
 // Tree nodes for statements
 
     case While(cond, stats) =>
-      print("while (").print(cond).print(") {").println;
-      indent;
+      print("while (").print(cond).print(") {");
+      indent; println;
       for (val s <- stats) {
 	print(s).println;
       }
       undent;
+      println;
       print("}");
 
     case Var(varname, vartype, init) =>
@@ -118,9 +126,7 @@
 
     case New(name, args) =>
       print("new ").print(name).print("(");
-      for (val a <- args) {
-	print(a).print(",");
-      }
+      joinprint(args, ", ");
       print(")");
 
     case Select(prefix, selector) =>
@@ -128,9 +134,7 @@
 
     case Call(obj, funcname, args) =>
       print(obj).print(".").print(funcname).print("(");
-      for (val a <- args) {
-	print(a).print(",");
-      }
+      joinprint(args, ", ")
       print(")");
 
     case NullLit() =>