initial commit

C++/lesson7/task9.cpp

@@ -0,0 +1,160 @@
+#include <iostream>
+#include <string>
+#include <vector>
+
+class Book {
+    int id;
+    std::string name;
+    std::string writer;
+    std::string year;
+
+   public:
+    Book() {}
+
+    Book(unsigned id, std::string name, std::string writer, std::string year) {
+        this->id = id;
+        this->name = name;
+        this->writer = writer;
+        this->year = year;
+    }
+
+    std::string& get_name() {
+        return name;
+    }
+    std::string& get_writer() {
+        return writer;
+    }
+    std::string& get_year() {
+        return year;
+    }
+
+    void setname(std::string name) {
+        this->name = name;
+    }
+    void setwriter(std::string writer) {
+        this->name = name;
+    }
+    void setyear(std::string year) {
+        this->name = name;
+    }
+};
+
+class Reader {
+    std::string name;
+    unsigned number;
+
+   public:
+    Reader() {}
+
+    Reader(std::string name, unsigned number) {
+        this->name = name;
+        this->number = number;
+    }
+
+    std::string& getName() {
+        return name;
+    }
+
+    unsigned getNumber() {
+        return number;
+    }
+
+    void setName(std::string name) {
+        this->name = name;
+    }
+
+    void setNumber(unsigned number) {
+        this->number = number;
+    }
+};
+
+class Library {
+   public:
+    Reader* readers;
+    size_t amount_readers;
+    Book* books;
+    size_t amount_books;
+
+    Library() {
+        readers = new Reader[0];
+        amount_readers = 0;
+        books = new Book[0];
+        amount_books = 0;
+    }
+
+    void addReader(Reader reader) {
+        Reader* new_readers = new Reader[amount_readers + 1];
+        for (size_t i = 0; i < amount_readers; i++) {
+            new_readers[i] = readers[i];
+        }
+        new_readers[amount_readers] = reader;
+        delete[] readers;
+        readers = new_readers;
+        amount_readers++;
+    }
+
+    void addBook(Book book) {
+        Book* new_books = new Book[amount_books + 1];
+        for (size_t i = 0; i < amount_books; i++) {
+            new_books[i] = books[i];
+        }
+        new_books[amount_books] = book;
+        delete[] books;
+        books = new_books;
+        amount_books++;
+    }
+
+    Book deleteBook(size_t n) {
+        Book* new_books = new Book[amount_books - 1];
+
+        for (size_t i = 0; i < n; i++) {
+            new_books[i] = books[i];
+        }
+
+        for (size_t j = n + 1; j < amount_books; j++) {
+            new_books[j - 1] = books[j];
+        }
+        Book deleted = books[n];
+        delete[] books;
+        books = new_books;
+        amount_books -= 1;
+        return deleted;
+    }
+
+    Book takeBook(size_t n) {
+        Book taken = this->deleteBook(n);
+        std::cout << "Book" << taken.get_name() << "is taken\n";
+        return taken;
+    }
+
+    void returnBook(Book book) {
+        std::cout << "Book" << book.get_name() << "is returned\n";
+        this->addBook(book);
+    }
+};
+
+int main() {
+    Book WarAndPeace(0, "WarAndPeace", "Tolstoy", "1867");
+    Book EugeneOnegin(1, "EugeneOnegin", "Pushkin", "1832");
+    Book HeroOfOurTime(2, "HeroOfOurTime", "Lemontov", "1840");
+    Book PortraitOfDorianGray(3, "PortraitOfDorianGray", "Wilde", "1890");
+
+    Library library;
+    library.addBook(WarAndPeace);
+    library.addBook(EugeneOnegin);
+    library.addBook(HeroOfOurTime);
+    library.addBook(PortraitOfDorianGray);
+
+    Reader petya("Petya", 0);
+    Reader vasya("Vasya", 1);
+    library.addReader(petya);
+    library.addReader(vasya);
+
+    Book book1 = library.takeBook(0);
+    Book book2 = library.takeBook(0);
+
+    library.returnBook(book1);
+    library.returnBook(book2);
+
+    library.takeBook(3);
+}