diff --git a/homework4/src/test2.c b/homework4/src/test2.c
new file mode 100644
index 0000000..80f088f
--- /dev/null
+++ b/homework4/src/test2.c
@@ -0,0 +1,8 @@
+// test2.c
+// 点亮数码管段b和c，让数码管显示一个数字1；
+
+#include "homework4.h"
+
+void main() {
+
+}
\ No newline at end of file