provided code

src/main/wacc/Main.scala

@@ -0,0 +1,15 @@
+package wacc
+
+import parsley.{Success, Failure}
+
+def main(args: Array[String]): Unit = {
+    println("hello WACC!")
+
+    args.headOption match {
+        case Some(expr) => parser.parse(expr) match {
+            case Success(x) => println(s"$expr = $x")
+            case Failure(msg) => println(msg)
+        }
+        case None => println("please enter an expression")
+    }
+}