diff --git a/stack.h b/stack.h
new file mode 100644
index 0000000000000000000000000000000000000000..9796be5f47ab539a622deaa3bf8b563157b7c7ab
--- /dev/null
+++ b/stack.h
@@ -0,0 +1,10 @@
+#ifndef _STACK_H_
+#define _STACK_H_
+
+typedef struct _stack {
+    int *data;
+    int capacity;
+    int top;
+} stack;
+
+#endif