diff --git "a/Algorithms/\347\272\277\346\200\247\347\273\223\346\236\204/\346\240\210/Stack.cpp" "b/Algorithms/\347\272\277\346\200\247\347\273\223\346\236\204/\346\240\210/Stack.cpp"
index 068d7d7..263cfa2 100644
--- "a/Algorithms/\347\272\277\346\200\247\347\273\223\346\236\204/\346\240\210/Stack.cpp"
+++ "b/Algorithms/\347\272\277\346\200\247\347\273\223\346\236\204/\346\240\210/Stack.cpp"
@@ -12,12 +12,12 @@ Stack::Stack()
 
 bool Stack::isEmpty() const
 {
-    return _top >= 0;
+    return _top >! 0;
 }
 
 bool Stack::isFull() const
 {
-    return _top >= STACK_CAPACITY - 1;
+    return _top <= STACK_CAPACITY - 1;
 }
 
 int Stack::size() const