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/book.cpp b/book.cpp
deleted file mode 100644
index abb721f..0000000
--- a/book.cpp
+++ /dev/null
@@ -1,170 +0,0 @@
-#include <iostream>
-using namespace std;
-
-#include "sqlist.h" // 顺序表
-
-// 图书信息
-struct Book {
-    int id;        // 编号
-    string title;  // 标题
-    string author; // 作者
-    float price;   // 价格
-};
-
-// 所有书的列表
-SqList<Book> books;
-
-int get_command();   // 读取命令
-void DoAddBook();    // 添加图书
-void DoFindBook();   // 查找图书
-void DoDeleteBook(); // 删除图书
-void DoPrintBook();  // 打印图书
-
-int main()
-{
-    bool finish = false;
-
-    InitList(books);
-
-    while (!finish) {
-        switch (get_command()) {
-        case 1: // Add book
-            DoAddBook();
-            break;
-        case 2: // Find book
-            DoFindBook();
-            break;
-        case 3: // Delete book
-            DoDeleteBook();
-            break;
-        case 4: // Print
-            DoPrintBook();
-            break;
-        case 0: // Exit
-            finish = true;
-            break;
-        default: // no command
-            cout << "Error command." << endl;
-        }
-    }
-
-    DestroyList(books);
-
-    return 0;
-}
-
-// 读取命令
-int get_command()
-{
-    int cmd;
-    cout << "Commands: (1) Add, (2) Find, (3) Delete, (4) Print, (0) Exit\n";
-    cout << "Enter your choice (0-4): ";
-    cin >> cmd;
-    return cmd;
-}
-
-// 输入一本书的信息
-void read(Book& b)
-{
-    cout << "ID    : ";
-    cin >> b.id;
-    cin.ignore(1024, '\n'); // skip rest chars of the line
-    cout << "TITLE : ";
-    getline(cin, b.title);
-    cout << "AUTHOR: ";
-    getline(cin, b.author);
-    cout << "PRICE : ";
-    cin >> b.price;
-}
-
-// 打印一本书的信息
-void print(const Book& b)
-{
-    cout << "Book { id: " << b.id << ","
-         << " title:\"" << b.title << "\","
-         << " author: \"" << b.author << "\","
-         << " price: " << b.price << " }"
-         << endl;
-}
-
-// 根据 id 查找图书
-// 若找到，返回元素的位序，找不到时返回 0
-int find(int id)
-{
-    
-    for (int i = 1; i <= books.length; i++)
-    {
-        if (id == books.elem[i].id){
-        return i;
-        }
-    }
-    return 0; // not found
-}
-
-// 添加图书
-void DoAddBook()
-{
-    Book e;
-    read(e);
-    books.elem[books.length + 1] = e;
-    books.length++;
-    print(e);
-    cout << "Added" << endl;
-}
-
-// 查找图书
-void DoFindBook()
-{
-    int id;
-    cout << "Enter book ID: ";
-    cin >> id;
-    Book e;
-
-    if (find(id) == 0)
-        cout << "Not found" << endl;
-    else
-    {
-        e = books.elem[find(id)];
-        print(e);
-        cout << "Found" << endl;
-    }
-}
-
-// 删除图书
-void DoDeleteBook()
-{
-    int id;
-    cout << "Enter book ID: ";
-    cin >> id;
-    Book e;
-    int c = find(id);
-    if (find(id) == 0)
-        cout << "Not found" << endl;
-    else
-    {
-        e = books.elem[c];
-        print(e);
-        for (int i = c; i < books.length; i++)
-        {
-            books.elem[i] = books.elem[i + 1];
-        }
-        --books.length;
-        cout << "Deleted" << endl;
-    }
-}
-
-// 打印图书
-void DoPrintBook()
-{
-    int flag = 0;
-    for (int i = 0; i < books.length; i++)
-    {
-        Book e;
-        e = books.elem[i + 1];
-        print(e);
-        flag++;
-    }
-    cout << "Total: ";
-    cout << flag;
-    cout << " books" << endl;
-}
\ No newline at end of file
diff --git a/data.h b/data.h
index 24e086e..61b738f 100644
--- a/data.h
+++ b/data.h
@@ -2,54 +2,221 @@
 #define DATA_H_INCLUDED
 
 #include <stdio.h>
+#include "sqlist.h"
+
+
+struct Book {
+    int id;        // 编号
+    string title;  // 标题
+    int number;    // 数量
+    };
+
+SqList <Book> books;
+
 // 函数声明
-void read_data(void);    // 读取
-void save_data(void);    // 保存
-void print_data(void);   // 打印
-void query_data(void);   // 查询
-void add_data(void);     // 添加
-void update_data(void);  // 修改
-void delete_data(void);  // 删除
-void sort_data(void);    // 排序
-void make_chart(void);   // 图表
-
-
-void read_data(void)
-    {
-        printf("读取\n");
-    }
-void save_data(void)
-    {
-        printf("保存\n");
-    }
-void print_data(void)
-    {
-        printf("打印\n");
+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
+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
+
+
+// 输入一本书的信息
+void input(Book& b)
+{
+    cout << "ID    : ";
+    cin >> b.id;
+    cin.ignore(1024, '\n'); // skip rest chars of the line
+    cout << "TITLE : ";
+    getline(cin, b.title);
+    cout << "Number : ";
+    while (1){
+        cin >> b.number;
+        if (b.number>0) break;
+        cout << "Number ERROR" << endl;
+        cout << "Input again" << endl;
     }
-void query_data(void)
+}
+
+// 打印一本书的信息
+void print(const Book& b)
+{
+    cout << "Book " << endl << endl
+         <<"**************** id: " << b.id << " ****************" << endl
+         << "**** title: 《 " << b.title << " 》****" << endl
+         << "************** Number: " << b.number << " **************" << endl << endl;
+}
+
+// 根据 id 查找图书
+// 若找到，返回元素的位序，找不到时返回 0
+int find(int id)
+{
+    
+    for (int i = 1; i <= books.length; i++)
     {
-        printf("查询\n");
+        if (id == books.elem[i].id){
+        return i;
+        }
     }
-void add_data(void)
+    return 0; // not found
+}
+
+// 书籍库判空
+bool bookempty()
+{
+    int a=0;
+    for (int i=1;i<=books.length;i++)
     {
-        puts("添加");
+        if (find(i)==0) a++;
     }
-void update_data(void)
+    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;
+    books.length++;
+    print(book);
+    cout << "*******Added********" << endl;
+}
+
+// 查找图书
+void DoFindBook()
+{
+    cout << endl << "Find Book" << endl <<endl;
+    int id;
+    cout << "Enter book ID: ";
+    cin >> id;
+
+    Book book;
+    if (find(id) == 0)
+        cout << "Not found" << endl;
+    else
     {
-        puts("修改");
+        book = books.elem[find(id)];
+        cout << "Found" << endl;
+        cout << "************" << endl;
+        print(book);
     }
-void delete_data(void)
+}
+
+// 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: ";
+    cin >> id;
+    Book e;
+    if (find(id) == 0)
+        cout << "Not found" << endl;
+    else
     {
-        puts("删除");
+        e = books.elem[find(id)];
+        print(e);
+        for (int i = find(id); i < books.length; i++)
+        {
+            books.elem[i] = books.elem[i + 1];
+        }
+        --books.length;
+        cout << "************************" << endl;
+        cout << "Deleted" << endl;
     }
-void sort_data(void)
+}
+
+// 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++)
     {
-        puts("排序");
+        Book e;
+        e = books.elem[i + 1];
+        print(e);
+        flag++;
     }
-void make_chart(void)
-    {
-        puts("图表");
+    cout << "Total: ";
+    cout << flag;
+    cout << " books" << endl;
+}
+
+// 归还图书
+void DoRepaidBook()
+{
+    cout << endl << "Repaid Book" << endl<<endl;
+    int id;
+    cout << "Which book you wanna repaid ? " << endl;
+    cin >> id;
+    cout << endl;
+    if (find(id)){
+        Book e;
+        e = books.elem[find(id)];
+        ++books.elem[find(id)].number;
+    }else{
+        DoAddBook();
     }
+}
+    
+// 借用图书
+void DoBoorowBook()
+{
+    cout << endl << "Boorow Book" << endl <<endl;
+    int id;
+    cout << "Which book you wanna boorow ? " << endl;
+    cin >> id;
+    cout << endl;
+    if (find(id)){
+    if (books.elem[find(id)].number>0) {
+        Book e;
+        e = books.elem[find(id)];
+        cout<< "*********"<< endl << "OK" << endl << "*********"<<endl;
+        --books.elem[find(id)].number;
+    }else cout << "***************************"<< endl
+    << "Book empty" << endl << "***************************" << endl;
+    }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/student.cpp b/student.cpp
deleted file mode 100644
index e4f8e07..0000000
--- a/student.cpp
+++ /dev/null
@@ -1,21 +0,0 @@
-#include <iostream>
-#include "student.h"
-using namespace std;
-
-struct student{
-    long int id[10]; ///十位学号
-    char name[15]; ///姓名
-    long int phonenumber[11]; //手机号
-    struct date;  //日期
-};
-
-struct date{
-    int year;  
-    int month;
-    int day;
-};
-
-int main()
-{
-
-}
diff --git a/student.h b/student.h
deleted file mode 100644
index 467bd93..0000000
--- a/student.h
+++ /dev/null
@@ -1,6 +0,0 @@
-///////////////////
-///student.cpp
-///////////////////
-
-
-
diff --git a/teammates b/teammates
deleted file mode 100644
index 4d6c713..0000000
--- a/teammates
+++ /dev/null
@@ -1,4 +0,0 @@
-杨腾泽
-孙英皓
-刘彩月
-李聪颖
\ No newline at end of file
diff --git a/title.cpp b/title.cpp
index 6e04899..007ba69 100644
--- a/title.cpp
+++ b/title.cpp
@@ -1,30 +1,22 @@
-///程序启动
-
-///1 读取 | 2 保存 | 3 打印 | 4 查询 | 5 添加
-///6 修改 | 7 删除 | 8 排序 | 9 图表 | 0 退出
-
-///请选择： 0 
-///确定要退出吗？(Y/N):  no
-
-    
-    
-    
-    
     #include <stdio.h>
     #include <stdlib.h>
+    #include <iostream>
+    using namespace std;
+
+
     #include "data.h"
+    #include "sqlist.h"
 
     enum {
-    CMD_QUIT,   // 退出
-    CMD_READ,   // 读取
-    CMD_SAVE,   // 保存
-    CMD_PRINT,  // 打印
-    CMD_QUERY,  // 查询
-    CMD_INSERT, // 添加
-    CMD_UPDATE, // 修改
-    CMD_DELETE, // 删除
-    CMD_SORT,   // 排序
-    CMD_CHART,  // 图表
+    CMD_QUIT,   // 退出程序
+    CMD_QUERY,  // 查书(数量)
+    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
     };
 
 
@@ -32,69 +24,83 @@
     void init(void);         // 程序启动
     void quit(void);         // 程序退出
     void display_menu(void); // 显示命令菜单
+
     int make_choice(void);   // 选择命令
     int confirm(const char* msg); // 确认
 
 
+
     // 主函数
     int main(void)
     {
         init();  // 程序启动
+
+        InitList(books);
+
         for(;;) {
         display_menu();  //
         int c = make_choice();
         switch(c) {
-        case CMD_READ:
-            read_data();
-            break;
-        case CMD_SAVE:
-            save_data();
-            break;
-        case CMD_PRINT:
-            print_data();
-            break;
-        case CMD_QUERY:
-            query_data();
-            break;
-        case CMD_INSERT:
-            add_data();
-            break;
-        case CMD_UPDATE:
-            update_data();
-            break;
-        case CMD_DELETE:
-            delete_data();
-            break;
-        case CMD_SORT:
-            sort_data();
-            break;
-        case CMD_CHART:
-            make_chart();
-            break;
-        case CMD_QUIT:
-            if (confirm("确定要退出吗？")) quit(); // 仅在确认后退出
-            break;
+        case CMD_REPAID:// 还书
+            {DoRepaidBook();
+            break;}
+        case CMD_BOOROW:// 借书
+            {DoBoorowBook();
+            break;}
+        case CMD_PRINT:// 打印所有书籍
+            {DoPrintBook();
+            break;}
+        case CMD_QUERY:// 查找书籍
+            {DoFindBook();
+            break;}
+        case CMD_INSERT:// 添加书籍
+            {DoAddBook();
+            break;}
+        case CMD_DELETE:// 删除书籍
+            {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
+            break;}
         default:
             puts("命令错误，请重新选择");
             break;}
         }
         quit();  // 程序退出
+
+        DestroyList(books);
         return 0;
     }
-    // 函数定义
+    
+
+
+
+
+    
     void init(void)
     {
-     puts("程序启动");
+     puts("*******图书管理系统启动*******");
     }
     void quit(void)
     {
-    puts("程序退出");
+    puts("系统退出");
     exit(EXIT_SUCCESS);
     }
+
+
+
     void display_menu(void)
     {
-        printf("\n%d 读取 | %d 保存 | %d 打印 | %d 查询 | %d 添加\n%d 修改 | %d 删除 | %d 排序 | %d 图表 | %d 退出\n\n",
-        CMD_READ,CMD_SAVE,CMD_PRINT,CMD_QUERY,CMD_INSERT,CMD_UPDATE,CMD_DELETE,CMD_SORT,CMD_CHART,CMD_QUIT);
+        cout << "————————————————————————————————————————————————————————————————"<<endl;
+        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)
     {
@@ -115,3 +121,6 @@
         return c == 'y' || c == 'Y'; // 返回确认结果
     }
 
+
+
+
diff --git a/xiaoming.md b/xiaoming.md
deleted file mode 100644
index a9a22e6..0000000
--- a/xiaoming.md
+++ /dev/null
@@ -1 +0,0 @@
-AAAA
\ No newline at end of file