diff --git a/version3.0/nasal_gc.h b/version3.0/nasal_gc.h
index d7b78c9..8dccb36 100644
--- a/version3.0/nasal_gc.h
+++ b/version3.0/nasal_gc.h
@@ -56,9 +56,19 @@ public:
     ~nasal_scalar();
     void clear();
     bool set_type(int);
-    // +-*/~
-    // =
-    // unary - !
+    int nasal_scalar_add(int,int);
+    int nasal_scalar_sub(int,int);
+    int nasal_scalar_mult(int,int);
+    int nasal_scalar_div(int,int);
+    int nasal_scalar_link(int,int);
+    int nasal_scalar_unary_sub(int);
+    int nasal_scalar_unary_not(int);
+    int nasal_scalar_cmp_equal(int,int);
+    int nasal_scalar_cmp_not_equal(int,int);
+    int nasal_scalar_cmp_less(int,int);
+    int nasal_scalar_cmp_greater(int,int);
+    int nasal_scalar_cmp_less_or_equal(int,int);
+    int nasal_scalar_cmp_greater_or_equal(int,int);
 };
 
 class nasal_virtual_machine
diff --git a/version3.0/nasal_runtime.h b/version3.0/nasal_runtime.h
new file mode 100644
index 0000000..b9f4987
--- /dev/null
+++ b/version3.0/nasal_runtime.h
@@ -0,0 +1,39 @@
+#ifndef __NASAL_RUNTIME_H__
+#define __NASAL_RUNTIME_H__
+
+class nasal_runtime
+{
+private:
+    nasal_ast root;
+    std::stack<int> function_position;
+    std::stack<int> running_stack;
+    std::stack<int> closure_stack;
+public:
+    nasal_runtime();
+    ~nasal_runtime();
+};
+
+nasal_runtime::nasal_runtime()
+{
+    root.clear();
+    while(!function_position.empty())
+        function_position.pop();
+    while(!running_stack.empty())
+        running_stack.pop();
+    while(!closure_stack.empty())
+        closure_stack.pop();
+    return;
+}
+nasal_runtime::~nasal_runtime()
+{
+    root.clear();
+    while(!function_position.empty())
+        function_position.pop();
+    while(!running_stack.empty())
+        running_stack.pop();
+    while(!closure_stack.empty())
+        closure_stack.pop();
+    return;
+}
+
+#endif
\ No newline at end of file