completato binary tree e implementato euler tour astratto + una sua implementazione per computazione aritmetica

euler_tour/expressions/ExpressionVariable.java

@@ -0,0 +1,18 @@
+package euler_tour.expressions;
+
+/**
+ * Created with MONSTER.
+ * User: xgiovio
+ * Date: 27/04/2014
+ * Time: 13:06
+ */
+public class ExpressionVariable extends ExpressionTerm {
+
+    protected Integer var;
+    public ExpressionVariable(Integer x) { var = x; }
+    public void setVariable(Integer x) { var = x; }
+    public Integer getValue() { return var; }
+    public String toString() { return var.toString(); }
+
+
+}