diff --git a/homework2/CMakeLists.txt b/homework2/CMakeLists.txt
index b651fc5..a8d698f 100644
--- a/homework2/CMakeLists.txt
+++ b/homework2/CMakeLists.txt
@@ -10,3 +10,7 @@ add_executable(test2 test2.cpp
         LinkList.h
         LinkList.cpp
 )
+add_executable(test3 test3.cpp
+        LinkList.h
+        LinkList.cpp
+)
diff --git a/homework2/test3.cpp b/homework2/test3.cpp
new file mode 100644
index 0000000..11489e2
--- /dev/null
+++ b/homework2/test3.cpp
@@ -0,0 +1,21 @@
+//test3.cpp
+#include <iostream>
+#include"LinkList.h"
+using namespace std;
+
+void alter_to_110_percent(bookList &l) {
+    bookNode *temp = l->next;
+    while (temp != NULL) {
+        temp->price *= 1.1;
+        temp = temp->next;
+    }
+}
+
+int main() {
+    bookList books = new bookNode;
+    books->next = NULL;
+    create(books);
+    alter_to_110_percent(books);
+    display(&books);
+    return 0;
+}