diff --git a/balloon/balloon_var.h b/balloon/balloon_var.h
deleted file mode 100644
index fbc237c..0000000
--- a/balloon/balloon_var.h
+++ /dev/null
@@ -1,208 +0,0 @@
-#ifndef __BALLOON_VAR_H__
-#define __BALLOON_VAR_H__
-
-class var
-{
-	private:
-		int type;
-		double number;
-		std::string str;
-		std::string name;
-		std::list<var> balloon_array;
-		std::list<var> balloon_hash;
-		abstract_syntax_tree function;
-	public:
-		var()
-		{
-			type=__null_type;
-			number=0;
-			str="";
-			name="";
-			balloon_array.clear();
-			balloon_hash.clear();
-			function.set_clear();
-			return;
-		}
-		var(const var& p)
-		{
-			type=p.type;
-			number=p.number;
-			str=p.str;
-			name=p.name;
-			balloon_array=p.balloon_array;
-			balloon_hash=p.balloon_hash;
-			function=p.function;
-			return;
-		}
-		var& operator=(const var& p)
-		{
-			type=p.type;
-			number=p.number;
-			str=p.str;
-			name=p.name;
-			balloon_array.clear();
-			balloon_hash.clear();
-			function.set_clear();
-			balloon_array=p.balloon_array;
-			balloon_hash=p.balloon_hash;
-			function=p.function;
-			return *this;
-		}
-		void print_var()
-		{
-			std::cout<<"[type: ";
-			print_scalar(type);
-			std::cout<<",name: "<<name<<",number: "<<number<<",string: "<<str<<" ]";
-			return;
-		}
-		void set_type(int);
-		void set_name(std::string);
-		void set_number(double);
-		void set_string(std::string);
-		void set_function(abstract_syntax_tree);
-		void append_array(var);
-		void append_hash(var);
-		int get_type();
-		std::string get_name();
-		double get_number();
-		std::string get_string();
-		var get_array_member(int);
-		var* get_array_member_addr(int);
-		var get_hash_member(std::string);
-		var* get_hash_member_addr(std::string);
-		abstract_syntax_tree get_function();
-		int get_array_size();
-};
-
-var error_var;
-
-void var::set_type(int _type)
-{
-	type=_type;
-	return;
-}
-
-void var::set_name(std::string _name)
-{
-	name=_name;
-	return;
-}
-
-void var::set_number(double _num)
-{
-	number=_num;
-	return;
-}
-
-void var::set_string(std::string _str)
-{
-	str=_str;
-	return;
-}
-
-void var::set_function(abstract_syntax_tree p)
-{
-	function=p;
-	return;
-}
-
-void var::append_array(var _new_var)
-{
-	balloon_array.push_back(_new_var);
-	return;
-}
-
-void var::append_hash(var _new_var)
-{
-	balloon_hash.push_back(_new_var);
-	return;
-}
-
-int var::get_type()
-{
-	return type;
-}
-
-std::string var::get_name()
-{
-	return name;
-}
-
-double var::get_number()
-{
-	return number;
-}
-
-std::string var::get_string()
-{
-	return str;
-}
-
-var var::get_array_member(int _place)
-{
-	if(balloon_array.empty())
-	{
-		std::cout<<">>[Runtime-error] overflow when searching member "<<_place<<" but the max size of array \'"<<name<<"\' is 0."<<std::endl;
-		return error_var;
-	}
-	int cnt=0;
-	for(std::list<var>::iterator i=balloon_array.begin();i!=balloon_array.end();++i,++cnt)
-		if(cnt==_place)
-			return *i;
-	std::cout<<">>[Runtime-error] overflow when searching member "<<_place<<" but the max size of array \'"<<name<<"\' is "<<cnt<<"(this means 0-"<<cnt-1<<")."<<std::endl;
-	return error_var;
-}
-
-var* var::get_array_member_addr(int _place)
-{
-	var* addr=NULL;
-	if(balloon_array.empty())
-	{
-		std::cout<<">>[Runtime-error] overflow when searching member "<<_place<<" but the max size of array \'"<<name<<"\' is 0."<<std::endl;
-		return &error_var;
-	}
-	int cnt=0;
-	for(std::list<var>::iterator i=balloon_array.begin();i!=balloon_array.end();++i,++cnt)
-		if(cnt==_place)
-		{
-			addr=&(*i);
-			return addr;
-		}
-	std::cout<<">>[Runtime-error] overflow when searching member "<<_place<<" but the max size of array \'"<<name<<"\' is "<<cnt<<"(this means 0-"<<cnt-1<<")."<<std::endl;
-	return &error_var;
-}
-
-var var::get_hash_member(std::string _name)
-{
-	for(std::list<var>::iterator i=balloon_hash.begin();i!=balloon_hash.end();++i)
-		if(i->name==_name)
-			return *i;
-	std::cout<<">>[Runtime-error] hash \'"<<name<<"\' does not have a member named \'"<<_name<<"\'"<<std::endl;
-	return error_var;
-}
-
-var* var::get_hash_member_addr(std::string _name)
-{
-	var* addr=NULL;
-	for(std::list<var>::iterator i=balloon_hash.begin();i!=balloon_hash.end();++i)
-		if(i->name==_name)
-		{
-			addr=&(*i);
-			return addr;
-		}
-	std::cout<<">>[Runtime-error] hash \'"<<name<<"\' does not have a member named \'"<<_name<<"\'"<<std::endl;
-	return &error_var;
-}
-
-abstract_syntax_tree var::get_function()
-{
-	return function;
-}
-
-int var::get_array_size()
-{
-	int cnt=0;
-	for(std::list<var>::iterator i=balloon_array.begin();i!=balloon_array.end();++i)++cnt;
-	return cnt;
-}
-#endif