diff --git a/codes/cpp/chapter_stack_and_queue/stack.cpp b/codes/cpp/chapter_stack_and_queue/stack.cpp
index bac778c..52d0b77 100644
--- a/codes/cpp/chapter_stack_and_queue/stack.cpp
+++ b/codes/cpp/chapter_stack_and_queue/stack.cpp
@@ -34,5 +34,6 @@ int main(){
 
     /* 判断是否为空 */
     bool empty = stack.empty();
+    
     return 0;
 }