diff --git a/homework1/CMakeLists.txt b/homework1/CMakeLists.txt
index 95bacc6..6c67530 100644
--- a/homework1/CMakeLists.txt
+++ b/homework1/CMakeLists.txt
@@ -6,3 +6,4 @@ set(CMAKE_CXX_STANDARD 20)
 add_executable(test1
         test1.cpp)
 add_executable(test2 test2.cpp)
+add_executable(test3 test3.cpp)
diff --git a/homework1/test2.cpp b/homework1/test2.cpp
index 4d46f15..23a4c35 100644
--- a/homework1/test2.cpp
+++ b/homework1/test2.cpp
@@ -28,7 +28,7 @@ void sort(book *arr, int size) {
 int main() {
     book books[100];
     int size = 0;
-    for (size = 0; 1; size++) {
+    for (size = 0; true; size++) {
         cin >> books[size].id >> books[size].name >> books[size].price;
         if (books[size].id == "0" && books[size].name == "0" && books[size].price == 0) {
             break;
@@ -36,7 +36,7 @@ int main() {
     }
     sort(books, size);
     for (int i = 0; i < size; i++) {
-        cout << books[i].id << " " << books[i].name << " " << fixed << setprecision(2) << books[i].price << endl;
+        cout << books[i].id << "\t" << books[i].name << "\t" << fixed << setprecision(2) << books[i].price << endl;
     }
     return 0;
 }
diff --git a/homework1/test3.cpp b/homework1/test3.cpp
new file mode 100644
index 0000000..bdc1756
--- /dev/null
+++ b/homework1/test3.cpp
@@ -0,0 +1,32 @@
+#include <iostream>
+#include <iomanip>
+
+using namespace std;
+
+typedef struct {
+    string id;
+    string name;
+    double price;
+} book;
+
+void alter_to_110_percent(book *books, int length) {
+    for (int i = 0; i < length; i++) {
+        books[i].price = books[i].price * 1.1;
+    }
+}
+
+int main() {
+    book books[100];
+    int length = 0;
+    for (length = 0; true; length++) {
+        cin >> books[length].id >> books[length].name >> books[length].price;
+        if (books[length].id == "0" && books[length].name == "0" && books[length].price == 0) {
+            break;
+        }
+    }
+    alter_to_110_percent(books, length);
+    for (int i = 0; i < length; i++) {
+        cout << books[i].id << "\t" << books[i].name << "\t" << fixed << setprecision(2) << books[i].price << endl;
+    }
+    return 0;
+}