diff --git a/balloon/abstract_syntax_tree.cpp b/balloon/abstract_syntax_tree.cpp
index 5134364..322a4fd 100644
--- a/balloon/abstract_syntax_tree.cpp
+++ b/balloon/abstract_syntax_tree.cpp
@@ -700,13 +700,7 @@ void abstract_syntax_tree::run_root()
 		else if(i->type==__equal || i->type==__add_equal || i->type==__sub_equal || i->type==__mul_equal || i->type==__div_equal || i->type==__link_equal)
 			i->assignment();
 		else if(i->type==__add_operator || i->type==__sub_operator || i->type==__mul_operator || i->type==__div_operator || i->type==__link_operator || i->type==__or_operator || i->type==__and_operator || i->type==__nor_operator)
-		{
 			var t=i->calculation();
-			if(t.get_type()==__var_number)
-				std::cout<<t.get_number()<<std::endl;
-			else if(t.get_type()==__var_string)
-				std::cout<<t.get_string()<<std::endl;
-		}
 		else if(i->type==__number || i->type==__string)
 			;
 		else if(i->type==__id)
@@ -757,7 +751,6 @@ int abstract_syntax_tree::run_loop()
 		return 0;
 	}
 	int ret=0;
-	scope.add_new_local_scope();
 	
 	abstract_syntax_tree condition=children.front();
 	abstract_syntax_tree blk=children.back();
@@ -774,7 +767,6 @@ int abstract_syntax_tree::run_loop()
 		if(exit_type!=__process_exited_successfully)
 			break;
 	}
-	scope.pop_last_local_scope();
 	--recursion_depth;
 	return ret;
 }
@@ -789,8 +781,6 @@ int abstract_syntax_tree::run_ifelse()
 		return 0;
 	}
 	int ret=0;
-	scope.add_new_local_scope();
-	
 	for(std::list<abstract_syntax_tree>::iterator i=children.begin();i!=children.end();++i)
 	{
 		if((i->type==__if || i->type==__elsif) && i->children.front().condition_check())
@@ -804,7 +794,6 @@ int abstract_syntax_tree::run_ifelse()
 			break;
 		}
 	}
-	scope.pop_last_local_scope();
 	--recursion_depth;
 	return ret;
 }
@@ -922,6 +911,7 @@ int abstract_syntax_tree::run_block()
 		return 0;
 	}
 	scope.add_new_local_scope();
+	int ret=0;
 	for(std::list<abstract_syntax_tree>::iterator i=children.begin();i!=children.end();++i)
 	{
 		if(i->type==__definition)
@@ -950,13 +940,7 @@ int abstract_syntax_tree::run_block()
 		else if(i->type==__equal || i->type==__add_equal || i->type==__sub_equal || i->type==__mul_equal || i->type==__div_equal || i->type==__link_equal)
 			i->assignment();
 		else if(i->type==__add_operator || i->type==__sub_operator || i->type==__mul_operator || i->type==__div_operator || i->type==__link_operator || i->type==__or_operator || i->type==__and_operator || i->type==__nor_operator)
-		{
-			var t=i->calculation();
-			if(t.get_type()==__var_number)
-				std::cout<<t.get_number()<<std::endl;
-			else if(t.get_type()==__var_string)
-				std::cout<<t.get_string()<<std::endl;
-		}
+			i->calculation();
 		else if(i->type==__while)
 		{
 			int type=i->run_loop();
@@ -964,8 +948,8 @@ int abstract_syntax_tree::run_block()
 			{
 				if(type==__return)
 				{
-					--recursion_depth;
-					return type;
+					ret=type;
+					break;
 				}
 				else
 				{
@@ -979,19 +963,14 @@ int abstract_syntax_tree::run_block()
 			int type=i->run_ifelse();
 			if(type)
 			{
-				--recursion_depth;
-				return type;
+				ret=type;
+				break;
 			}
 		}
-		else if(i->type==__continue)
+		else if(i->type==__continue || i->type==__break)
 		{
-			--recursion_depth;
-			return __continue;
-		}
-		else if(i->type==__break)
-		{
-			--recursion_depth;
-			return __break;
+			ret=i->type;
+			break;
 		}
 		else if(i->type==__return)
 		{
@@ -1000,15 +979,15 @@ int abstract_syntax_tree::run_block()
 			if(!(i->children.empty()))
 				temp=i->children.front().calculation();
 			ret_stack.push(temp);
-			--recursion_depth;
-			return __return;
+			ret=__return;
+			break;
 		}
 		if(exit_type!=__process_exited_successfully)
 			break;
 	}
 	scope.pop_last_local_scope();
 	--recursion_depth;
-	return 0;
+	return ret;
 }
 
 
diff --git a/balloon/balloon_scope.h b/balloon/balloon_scope.h
index 22a5a2d..004c1bb 100644
--- a/balloon/balloon_scope.h
+++ b/balloon/balloon_scope.h
@@ -23,8 +23,9 @@ class balloon_scope
 		}
 		bool search_var(std::string name)
 		{
-			if(!scope_list.empty())
+			if(!scope_list.empty() && !scope_list.back().empty())
 			{
+				
 				std::list<std::list<var> >::iterator i=scope_list.back().end();
 				--i;
 				for(;;--i)
@@ -46,7 +47,7 @@ class balloon_scope
 		}
 		void add_new_var(var t)
 		{
-			if(!scope_list.empty())
+			if(!scope_list.empty() && !scope_list.back().empty())
 			{
 				std::list<std::list<var> >::iterator i=scope_list.back().end();
 				--i;
@@ -58,7 +59,7 @@ class balloon_scope
 		}
 		var get_var(std::string name)
 		{
-			if(!scope_list.empty())
+			if(!scope_list.empty() && !scope_list.back().empty())
 			{
 				std::list<std::list<var> >::iterator i=scope_list.back().end();
 				--i;
@@ -83,7 +84,7 @@ class balloon_scope
 		var* get_addr(std::string name)
 		{
 			var* addr=NULL;
-			if(!scope_list.empty())
+			if(!scope_list.empty() && !scope_list.back().empty())
 			{
 				std::list<std::list<var> >::iterator i=scope_list.back().end();
 				--i;
@@ -136,11 +137,8 @@ class balloon_scope
 		}
 		void pop_last_local_scope()
 		{
-			if(!scope_list.empty())
-			{
-				std::list<std::list<var> > temp=scope_list.back();
-				temp.pop_back();
-			}
+			if(!scope_list.empty() && !scope_list.back().empty())
+				scope_list.back().pop_back();
 			return;
 		}
 };