diff --git a/.vscode/settings.json b/.vscode/settings.json
new file mode 100644
index 0000000..36f10cd
--- /dev/null
+++ b/.vscode/settings.json
@@ -0,0 +1,7 @@
+{
+    "files.associations": {
+        "iostream": "cpp",
+        "ostream": "cpp",
+        "stdexcept": "cpp"
+    }
+}
\ No newline at end of file
diff --git a/.vscode/tasks.json b/.vscode/tasks.json
new file mode 100644
index 0000000..ccfcfb2
--- /dev/null
+++ b/.vscode/tasks.json
@@ -0,0 +1,28 @@
+{
+    "tasks": [
+        {
+            "type": "cppbuild",
+            "label": "C/C++: g++.exe build active file",
+            "command": "C:\\mingw64\\bin\\g++.exe",
+            "args": [
+                "-fdiagnostics-color=always",
+                "-g",
+                "${file}",
+                "-o",
+                "${fileDirname}\\${fileBasenameNoExtension}.exe"
+            ],
+            "options": {
+                "cwd": "${fileDirname}"
+            },
+            "problemMatcher": [
+                "$gcc"
+            ],
+            "group": {
+                "kind": "build",
+                "isDefault": true
+            },
+            "detail": "Task generated by Debugger."
+        }
+    ],
+    "version": "2.0.0"
+}
\ No newline at end of file
diff --git a/data.h b/data.h
index 0955567..61b738f 100644
--- a/data.h
+++ b/data.h
@@ -5,15 +5,19 @@
 #include "sqlist.h"
 
 
-// 函数声明
+struct Book {
+    int id;        // 编号
+    string title;  // 标题
+    int number;    // 数量
+    };
 
-void print_book(void);   // 打印
-void query_book(void);   // 查询
-void add_book(void);     // 添加
-void delete_book(void);  // 删除
-void boorow_book(void);  // 借书
-void repaid_book(void);  // 还书
+SqList <Book> books;
 
+// 函数声明
+bool bookempty();         // 书籍库判空
+void input(Book& b);      // 输入一本书的信息
+void print(const Book& b);// 打印一本书的信息
+int find(int id);         // 根据 id 查找图书 || 若找到，返回元素的位序，找不到时返回 0
 
 void DoAddBook();    // 添加图书
 void DoFindBook();   // 查找图书
@@ -21,54 +25,11 @@ void DoDeleteBook(); // 删除图书
 void DoPrintBook();  // 打印所有图书
 void DoRepaidBook(); // 归还图书
 void DoBoorowBook(); // 借用图书
+void DoReviseBook(); // 修改图书
+void DoSortBook();   // 排序图书
 
 
-
-
-void repaid_book(void)  // 还书
-    {
-        printf("还书\n");
-        DoRepaidBook();
-    }
-void boorow_book(void)  // 借书
-    {
-        printf("借书\n");
-        DoBoorowBook();
-    }
-void query_book(void)   // 查询
-    {
-        printf("查书\n");
-        DoFindBook();
-    }
-void print_book(void)   // 打印
-    {
-        printf("打印\n");
-        DoPrintBook();
-    }   
-void add_book(void)     // 添加
-    {
-        puts("添加");
-        DoAddBook(); 
-    }
-void delete_book(void)  // 删除
-    {
-        puts("删除");
-        DoDeleteBook();
-    }
-
-
-
-
-
-struct Book {
-    int id;        // 编号
-    string title;  // 标题
-    int number;    // 数量
-    };
-
-SqList <Book> books;
-
-    // 输入一本书的信息
+// 输入一本书的信息
 void input(Book& b)
 {
     cout << "ID    : ";
@@ -108,10 +69,22 @@ int find(int id)
     return 0; // not found
 }
 
+// 书籍库判空
+bool bookempty()
+{
+    int a=0;
+    for (int i=1;i<=books.length;i++)
+    {
+        if (find(i)==0) a++;
+    }
+    if (a==books.length) return true;
+    else return false;
+}
 
 // 添加图书
 void DoAddBook()
 {
+    cout << endl << "Add Book"<< endl<<endl;
     Book book;
     input(book); //输入图书
     books.elem[books.length + 1] = book;
@@ -123,6 +96,7 @@ void DoAddBook()
 // 查找图书
 void DoFindBook()
 {
+    cout << endl << "Find Book" << endl <<endl;
     int id;
     cout << "Enter book ID: ";
     cin >> id;
@@ -142,6 +116,7 @@ void DoFindBook()
 // 删除图书
 void DoDeleteBook()
 {
+    cout << endl << "Delete Book" << endl << endl;
     int id;
     cout << "Which book you wanna delelet?"<<endl;
     cout << "Enter book ID: ";
@@ -166,6 +141,7 @@ void DoDeleteBook()
 // 打印所有图书
 void DoPrintBook()
 {
+    cout << endl << "Print All Books" << endl <<endl;
     int flag = 0;
     for (int i = 0; i < books.length; i++)
     {
@@ -182,6 +158,7 @@ void DoPrintBook()
 // 归还图书
 void DoRepaidBook()
 {
+    cout << endl << "Repaid Book" << endl<<endl;
     int id;
     cout << "Which book you wanna repaid ? " << endl;
     cin >> id;
@@ -198,6 +175,7 @@ void DoRepaidBook()
 // 借用图书
 void DoBoorowBook()
 {
+    cout << endl << "Boorow Book" << endl <<endl;
     int id;
     cout << "Which book you wanna boorow ? " << endl;
     cin >> id;
@@ -210,9 +188,35 @@ void DoBoorowBook()
         --books.elem[find(id)].number;
     }else cout << "***************************"<< endl
     << "Book empty" << endl << "***************************" << endl;
-    }else throw "NOT FOUND THIS BOOK";
+    }else cout<< "NOT FOUND THIS BOOK"<<endl;
 }
 
+// 修改图书
+void DoReviseBook()
+{
+    cout <<endl<< "Revise Book" <<endl <<endl;
+    int id;
+	printf( "Which book you wanna revise ?\n" );
+    cin >> id;
 
+	if ( find(id)!=0 ) {
+		printf ( "Original book number : %d\n", books.elem[id].number );
+		printf ( "Revised number :" );
+		int xiugai;
+		scanf ( "%d", &xiugai );
+		books.elem[id].number+=xiugai;
+        cout << "**********************" << endl;
+		printf ( "Revise success \n" );
+	}
+	else printf ( "No such book\n");
+}
+
+// 排序图书
+void DoSortBook()
+{
+    cout << endl << "Sort Books" << endl << endl;
+    int a=0;
+    if (bookempty()) cout << "Book data empty"<< endl;
 
+}  
 #endif // DATA_H_INCLUDED
\ No newline at end of file
diff --git a/title.cpp b/title.cpp
index 0e3f6d7..007ba69 100644
--- a/title.cpp
+++ b/title.cpp
@@ -10,11 +10,13 @@
     enum {
     CMD_QUIT,   // 退出程序
     CMD_QUERY,  // 查书(数量)
-    CMD_BOOROW, // 借书
-    CMD_REPAID, // 还书
+    CMD_BOOROW, // 借用书籍
+    CMD_REPAID, // 归还书籍
     CMD_PRINT,  // 打印书籍
     CMD_INSERT, // 添加书籍
     CMD_DELETE, // 删除书籍
+    CMD_UPDATE, // 修改书籍
+    CMD_SORT,   // 排序书籍
     };
 
 
@@ -40,22 +42,28 @@
         int c = make_choice();
         switch(c) {
         case CMD_REPAID:// 还书
-            {repaid_book();
+            {DoRepaidBook();
             break;}
         case CMD_BOOROW:// 借书
-            {boorow_book();
+            {DoBoorowBook();
             break;}
         case CMD_PRINT:// 打印所有书籍
-            {print_book();
+            {DoPrintBook();
             break;}
         case CMD_QUERY:// 查找书籍
-            {query_book();
+            {DoFindBook();
             break;}
         case CMD_INSERT:// 添加书籍
-            {add_book();
+            {DoAddBook();
             break;}
         case CMD_DELETE:// 删除书籍
-            {delete_book();
+            {DoDeleteBook(); 
+            break;}
+        case CMD_UPDATE:// 修改书籍
+            {DoReviseBook();
+            break;}
+        case CMD_SORT:  // 排序书籍
+            {DoSortBook();
             break;}
         case CMD_QUIT:// 退出程序
             {if (confirm("确定要退出吗？")) quit(); // 仅在确认后退出
@@ -90,8 +98,8 @@
     void display_menu(void)
     {
         cout << "————————————————————————————————————————————————————————————————"<<endl;
-        printf("| %d 查书 | %d 借书 | %d 还书 | %d 打印 | %d 添加 | %d 删除 | %d 退出 |\n",
-       CMD_QUERY,CMD_BOOROW,CMD_REPAID,CMD_PRINT,CMD_INSERT,CMD_DELETE,CMD_QUIT);
+        printf("| %d 查书 | %d 借书 | %d 还书 | %d 打印 | %d 添加 |\n| %d 删除 | %d 修改 | %d 排序 | %d 退出 |\n",
+       CMD_QUERY,CMD_BOOROW,CMD_REPAID,CMD_PRINT,CMD_INSERT,CMD_DELETE,CMD_UPDATE,CMD_SORT,CMD_QUIT);
         cout << "————————————————————————————————————————————————————————————————"<<endl;
     }
     int make_choice(void)