svn:ignore set on bottomup directory, added Evaluator

git-svn-id: svn://anubis/gvsu@111 45c1a28c-8058-47b2-ae61-ca45b979098e

cs675/bottomup/Makefile

@@ -4,3 +4,7 @@ all: sablecc
 .PHONY: sablecc
 sablecc:
 	sablecc arithmetic.grammar
+
+.PHONY: run
+run:
+	java jholtrop.gvsu.cs675.bottomup.Evaluator

cs675/bottomup/jholtrop/gvsu/cs675/bottomup/Evaluator.java

@@ -0,0 +1,29 @@
+
+package jholtrop.gvsu.cs675.bottomup;
+
+import java.io.*;
+
+public class Evaluator
+{
+    public static void main(String[] args)
+    {
+        Evaluator e = new Evaluator();
+        e.evaluate();
+    }
+
+    void evaluate()
+    {
+        try
+        {
+            System.out.println("Enter an expression to evaluate");
+            Parser p = new Parser(new Lexer(new PushbackReader(
+                            new InputStreamReader(System.in), 1024)));
+
+            Start tree = p.parse();
+        }
+        catch (Exception e)
+        {
+            System.out.println(e.getMessage());
+        }
+    }
+}