/* * Created by Андрей Шершень * * Amended extensively by Xan * Date: 15th April 2018 * * Note: This isn't best run in SoloLearn's Code Playground * because SL doesn't handle user input very well. * Recommended to compile and run in a better C++ environment. * * * Although this is a demo, the following to do list, * would be fun to implement: * * TO DO: * * 1) More testing is required, especially deleting of books. * 2) Write unit tests (to ensure the code is robust). * 3) Code review (Get other people to check the code). * 4) Ideally, we shouldn't use regular arrays for storing * the books... we could just use a C++ list instead. * 5) Currently, find_by_author() allows no author to be * entered. * 6) find_by_author() search should be case-insensitive. * 7) Strip spaces from start and end of user input. * 8) The book id, shouldn't be the same as the array index * because as the books are deleted, some of the indexes * will change for the books. It's better if book id's * remain the same. * 9) Allow a list of books to be added more than once. * 10) Create a menu system, that allows catalogue commands * to be executed at any time, then finally allowing * the user to quit from the system. */ #include #include #include using namespace std; class Book { public: string m_name; string m_author; void add_book_details_via_user(); }; class Catalogue: public Book { private: Book* m_book_list; int m_number_of_books; public: Catalogue(); ~Catalogue(); bool add_books(int number_of_books); bool delete_book(int book_id); bool find_books_by_author(); void show_catalogue(); }; void Book::add_book_details_via_user() { cout << " Name of the book: "; //getline(cin, m_name); cin >> m_name; //cout << endl; cout << " Author: "; cin >> m_author; //getline(cin, m_author); //cout << endl; } // Constructor. Catalogue::Catalogue() { m_number_of_books = 0; m_book_list = NULL; } // Destructor. Catalogue::~Catalogue() { if (m_book_list != NULL) { delete[](m_book_list); m_book_list = NULL; } m_number_of_books = 0; } /** * Limitation: At the moment, you can only add a set of books once. * You can't then later add more books. The original creator of the * code didn't foresee this issue. In theory, we should be using * lists and not standard arrays. */ bool Catalogue::add_books(int number_of_books) { if (m_book_list != NULL) { cout << endl << "WARNING: You can only add books to the system once (current limitation)!" << endl; return false; } else if (number_of_books <= 0) { cout << endl << "WARNING: Number of books to add must be a positive number!" << endl; return false; } else if (number_of_books > 10) { cout << endl << "WARNING: Can only add up to 10 books at once!" << endl; return false; } else { m_book_list = new Book[number_of_books]; m_number_of_books = number_of_books; for (int i = 0; i < m_number_of_books; i++) { cout << endl << "Book " << i << ":" << endl; m_book_list[i].add_book_details_via_user(); } return true; } } bool Catalogue::delete_book(int book_id) { if (m_number_of_books == 0) { cout << endl << "WARNING: There are no books to delete. Add some books first!" << endl; return false; } else if (book_id < 0 || book_id >= m_number_of_books) { cout << endl << "WARNING: Book number " << book_id << " not found!" << endl; return false; } else { for (int i = book_id; i < (m_number_of_books - 1); i++) { m_book_list[i] = m_book_list[i + 1]; } // Empty the book at the end of the list. m_book_list[m_number_of_books - 1].m_author = ""; m_book_list[m_number_of_books - 1].m_name = ""; if (m_number_of_books > 0) { m_number_of_books--; // If we have no books, we might as well delete the array. // This will allow people to add a new list of books. if (m_number_of_books == 0 && m_book_list != NULL) { delete[] m_book_list; m_book_list = NULL; } } return true; } } bool Catalogue::find_books_by_author() { if (m_number_of_books == 0) { cout << endl << "WARNING: There are no books to find. Add some books first!" << endl; return false; } bool book_found = false; string author_to_search; cout << endl << "### Input author to search by: "; cin >> author_to_search; for (int i = 0; i < m_number_of_books; i++) { if (m_book_list[i].m_author == author_to_search) { cout << endl << "Book " << i << ":" << endl << " Name: " << m_book_list[i].m_name << endl << " Author: " << m_book_list[i].m_author << endl; book_found = true; } } if (!book_found) { cout << endl << "WARNING: Author '" << author_to_search << "' not found!" << endl; } return book_found; } void Catalogue::show_catalogue() { cout << endl << "S H O W C A T A L O G U E" << endl; cout << "===========================" << endl; cout << endl << "Number of books: " << m_number_of_books << endl; for (int i = 0; i < m_number_of_books; i++) { cout << endl << "Book " << i << ":" << endl << " Name: " << m_book_list[i].m_name << endl << " Author: " << m_book_list[i].m_author << endl; } } int main() { int number_of_books_to_add; int book_id; Catalogue catalogue; // Keep trying to add books, if we fail to do so. bool books_added_successfully = false; while (!books_added_successfully) { cout << endl << "### Enter the number of books to add: "; cin >> number_of_books_to_add; books_added_successfully = catalogue.add_books(number_of_books_to_add); } // We can only add books once (this should give a warning). catalogue.add_books(5); // Show all the books in the catalogue. catalogue.show_catalogue(); // Check the deletion of a book, four times. for (int i = 1; i <= 4; i++) { // Delete a book (of the user's choice). cout << endl << "### Enter the number of the book, you want to delete: "; cin >> book_id; catalogue.delete_book(book_id); // Show all the books in the catalogue. catalogue.show_catalogue(); } // Find book(s) by author. catalogue.find_books_by_author(); //system("pause"); return 0; }

Book Catalogue System (Helping Someone)