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book.cpp

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+#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;
+}