diff --git a/balloon/balloon_scope.h b/balloon/balloon_scope.h
deleted file mode 100644
index 5435535..0000000
--- a/balloon/balloon_scope.h
+++ /dev/null
@@ -1,260 +0,0 @@
-#ifndef __BALLOON_SCOPE_H__
-#define __BALLOON_SCOPE_H__
-
-
-/*
-	when running a balloon process
-	there will be two types of blocks:
-		root block
-			if-else block
-			loop block
-		function block
-	and many types of local scopes:
-		if-else local scope
-		loop local scope
-	local scopes must be put in a block
-	values in different blocks cannot call each other
-*/
-class balloon_scope
-{
-	private:
-		std::list<var> global;
-		std::list<std::list<std::list<var> > > scope_list;
-		/*
-			example:
-				std::list<var> global                  // global scope
-				std::list<std::list<std::list<var> > > // total scope
-					-> std::list<std::list<var> >      // block scope
-						->std::list<var>               // local scope
-							-> var -> var -> var -> var
-		*/
-	public:
-		void set_clear()
-		{
-			global.clear();
-			scope_list.clear();
-			return;
-		}
-		bool check_redefine(std::string name)
-		{
-			if(!scope_list.empty() && !scope_list.back().empty())
-			{
-				// check the last block scope
-				// redefinition only occurs in last block scope
-				// if scope list is empty ,then check the global scope
-				std::list<std::list<var> >::iterator i=scope_list.back().end();
-				--i;
-				for(std::list<var>::iterator j=i->begin();j!=i->end();++j)
-					if(j->get_name()==name)
-						return true;
-				return false;
-			}
-			if(!global.empty())
-			{
-				for(std::list<var>::iterator i=global.begin();i!=global.end();++i)
-					if(i->get_name()==name)
-						return true;
-				return false;
-			}
-			return false;
-		}
-		bool search_var(std::string name)
-		{
-			if(!scope_list.empty() && !scope_list.back().empty())
-			{
-				// get the last block
-				std::list<std::list<var> >::iterator i=scope_list.back().end();
-				--i;
-				for(;;--i)
-				{
-					if(!i->empty())// avoid sigsegv
-					{
-						for(std::list<var>::iterator j=i->begin();j!=i->end();++j)
-							if(j->get_name()==name)
-								return true;
-					}
-					if(i==scope_list.back().begin())
-						break;
-				}
-			}
-			if(!global.empty())
-			{
-				for(std::list<var>::iterator i=global.begin();i!=global.end();++i)
-					if(i->get_name()==name)
-						return true;
-			}
-			return false;
-		}
-		void add_new_var(var t)
-		{
-			if(!scope_list.empty() && !scope_list.back().empty())
-			{
-				// get the last block and the get the last local scope in this blcok
-				std::list<std::list<var> >::iterator i=scope_list.back().end();
-				--i;
-				i->push_back(t);
-				return;
-			}
-			global.push_back(t);
-			return;
-		}
-		void print_last_block()
-		{
-			if(!scope_list.empty() && !scope_list.back().empty())
-			{
-				std::list<std::list<var> >::iterator i=scope_list.back().end();
-				--i;
-				// get the last scope block(std::list<std::list<var> >)
-				for(;;--i)
-				{
-					if(!i->empty())// avoid sigsegv
-					{
-						for(std::list<var>::iterator j=i->begin();j!=i->end();++j)
-							std::cout<<j->get_name()<<std::endl;
-					
-					}
-					if(i==scope_list.back().begin())
-						break;
-				}
-			}
-			return;
-		}
-		var get_var(std::string name)
-		{
-			if(!scope_list.empty() && !scope_list.back().empty())
-			{
-				std::list<std::list<var> >::iterator i=scope_list.back().end();
-				--i;
-				// get the last scope block(std::list<std::list<var> >)
-				for(;;--i)
-				{
-					if(!i->empty())// avoid sigsegv
-					{
-						for(std::list<var>::iterator j=i->begin();j!=i->end();++j)
-							if(j->get_name()==name)
-								return *j;
-					}
-					if(i==scope_list.back().begin())
-						break;
-				}
-			}
-			if(!global.empty())
-			{
-				for(std::list<var>::iterator i=global.begin();i!=global.end();++i)
-					if(i->get_name()==name)
-						return *i;
-			}
-			return error_var;
-		}
-		var* append_get_addr(std::string name)
-		{
-			var* addr=NULL;
-			if(!scope_list.empty())
-			{
-				int cnt=1;
-				// append function will get array's address from parameters' scope so the last two blocks will be checked
-				// because when calling a function,a new block scope will be created.
-				// but the array does not exist in this block,
-				// so you must find the block before this block.
-				std::list<std::list<std::list<var> > >::iterator blk=scope_list.end();
-				--blk;
-				for(;;--blk,++cnt)
-				{
-					if(!blk->empty())// avoid sigsegv
-					{
-						std::list<std::list<var> >::iterator i=blk->end();
-						--i;
-						for(;;--i)
-						{
-							if(!i->empty())// avoid sigsegv
-							{
-								for(std::list<var>::iterator j=i->begin();j!=i->end();++j)
-									if(j->get_name()==name)
-									{
-										addr=&(*j);
-										return addr;
-									}
-							}
-							if(i==blk->begin())
-								break;
-						}	
-					}
-					if(cnt==2 || blk==scope_list.begin())
-						break;
-				}
-			}
-			if(!global.empty())// if can't find array's address,find the global scope
-			{
-				for(std::list<var>::iterator i=global.begin();i!=global.end();++i)
-					if(i->get_name()==name)
-					{
-						addr=&(*i);
-						return addr;
-					}
-			}
-			return &error_var;
-		}
-		var* get_addr(std::string name)
-		{
-			var* addr=NULL;
-			if(!scope_list.empty() && !scope_list.back().empty())
-			{
-				// get the last block
-				std::list<std::list<var> >::iterator i=scope_list.back().end();
-				--i;
-				for(;;--i)
-				{
-					if(!i->empty())// avoid sigsegv
-						for(std::list<var>::iterator j=i->begin();j!=i->end();++j)
-							if(j->get_name()==name)
-							{
-								addr=&(*j);
-								return addr;
-							}
-					if(i==scope_list.back().begin())
-						break;
-				}
-			}
-			if(!global.empty())
-				for(std::list<var>::iterator i=global.begin();i!=global.end();++i)
-					if(i->get_name()==name)
-					{
-						addr=&(*i);
-						return addr;
-					}
-			return &error_var;
-		}
-		void add_new_block_scope()
-		{
-			std::list<std::list<var> > new_list;
-			scope_list.push_back(new_list);
-			return;
-		}
-		void add_new_local_scope()
-		{
-			if(!scope_list.empty())
-			{
-				std::list<std::list<std::list<var> > >::iterator i=scope_list.end();
-				--i;
-				std::list<var> new_list;
-				i->push_back(new_list);
-			}
-			return;
-		}
-		void pop_last_block_scope()
-		{
-			if(!scope_list.empty())
-				scope_list.pop_back();
-			return;
-		}
-		void pop_last_local_scope()
-		{
-			if(!scope_list.empty() && !scope_list.back().empty())
-				scope_list.back().pop_back();
-			return;
-		}
-};
-
-balloon_scope scope;
-
-#endif