diff --git a/homework2/test4.cpp b/homework2/test4.cpp
index 1ec628d..9c15836 100644
--- a/homework2/test4.cpp
+++ b/homework2/test4.cpp
@@ -1,4 +1,5 @@
 //test4.cpp
+#include <iomanip>
 #include<iostream>
 #include"LinkList.h"    //LinkList类见实验一
 using namespace std;
@@ -20,12 +21,37 @@ void create_with_count(bookList &l, int count) {
     }
 }
 
+double find_max_price(bookList *l) {
+    bookNode *temp = (*l)->next;
+    double max = 0;
+    while (temp != NULL) {
+        if (temp->price > max) {
+            max = temp->price;
+        }
+        temp = temp->next;
+    }
+    return max;
+}
+
+void display_max_prices(bookList *l, double max_price) {
+    bookNode *temp = *l;
+    while (temp != NULL) {
+        if (temp->price == max_price) {
+            cout << temp->id << " " << temp->name << " " << fixed << setprecision(2) << temp->price << endl;
+        }
+        temp = temp->next;
+    }
+}
+
 int main() {
-    bookList books = new bookNode;
-    books->next = NULL;
     int count;
+    bookList books = new bookNode;
+    double max_price;
+    books->next = NULL;
     cin >> count;
     create_with_count(books, count);
-    display(&books);
+    max_price = find_max_price(&books);
+    cout << max_price << endl;
+    display_max_prices(&books, max_price);
     return 0;
 }