--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/core_testing3/postfix_test1.scala	Thu Nov 02 13:53:37 2023 +0000
@@ -0,0 +1,10 @@
+
+def urbanmain() = {
+  import C3a._
+
+
+  assert(syard(split("3 + 4 * ( 2 - 1 )")) == List("3", "4", "2", "1", "-", "*", "+"))
+  assert(syard(split("( ( ( 3 ) ) + ( ( 4 + ( 5 ) ) ) )")) == List("3", "4", "5", "+", "+"))
+  assert(syard(split("5 + 7 / 2")) == List("5", "7", "2", "/", "+"))
+  assert(syard(split("5 * 7 / 2")) == List("5", "7", "*", "2", "/"))
+}