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