diff --git a/version0.15/version0.15.1/code_generator.h b/version0.15/version0.15.1/code_generator.h
deleted file mode 100644
index 368d5b0..0000000
--- a/version0.15/version0.15.1/code_generator.h
+++ /dev/null
@@ -1,81 +0,0 @@
-#ifndef __CODE_GENERATOR_H__
-#define __CODE_GENERATOR_H__
-
-#include "nasal_parser.h"
-#include "abstract_syntax_tree.h"
-#include <stack>
-
-class code_generator
-{
-	private:
-		ASTree root;
-		std::stack<ASTree> node_stack;
-		std::stack<parse_unit> temp;
-	public:
-		code_generator()
-		{
-			root.set_data(0,__root);
-		}
-		void number_node_gen()
-		{
-			NumberNode t;
-			t.setnumber(temp.top().content);
-			t.set_data(temp.top().line,__number);
-			if(node_stack.empty())
-				node_stack.push(t);
-			else if(node_stack.top().return_type()==__operator)
-				node_stack.top().return_child().push_back(t);
-			else
-				node_stack.push(t);
-			return;
-		}
-		void operator_node_gen()
-		{
-			OperatorNode t;
-			t.set_operator_type(temp.top().content);
-			t.set_data(temp.top().line,__operator);
-			if(node_stack.empty())
-			{
-				std::cout<<"line "<<temp.top().line<<":parse error.\n";
-				return;
-			}
-			if(node_stack.top().return_type()==__number || node_stack.top().return_type()==__operator)
-			{
-				t.return_child().push_back(node_stack.top());
-				node_stack.pop();
-				node_stack.push(t);
-			}
-			return;
-		}
-		void run()
-		{
-			root.print_tree();
-			std::cout<<std::endl;
-			return;
-		}
-		void stack_input(std::stack<parse_unit>& parse)
-		{
-			while(!node_stack.empty())
-				node_stack.pop();
-			temp=parse;
-			while(!temp.empty())
-			{
-				switch(temp.top().type)
-				{
-					case __number:number_node_gen();break;
-					case __add_operator:operator_node_gen();break;
-					case __sub_operator:operator_node_gen();break;
-					default:std::cout<<"line "<<temp.top().line<<":parse error.\n";break;
-				}
-				temp.pop();
-			}
-			while(!node_stack.empty())
-			{
-				root.return_child().push_back(node_stack.top());
-				node_stack.pop();
-			}
-			return;
-		}
-};
-
-#endif