Массив структур "Библиотека" (дополнить программу) - C++ - Ответ 10357157

#include <iostream>
#include <cstring>
#include <vector>
#include <algorithm>
 
struct Book
{
  std::string name, author, publisher, genre;
};
 
void PrintByIndex(const std::vector<Book> &b, const size_t index);
 
int main()
{
  const unsigned int NumberOfElements = 10;
  const std::string items[] = { 
    "1) Edit.",
    "2) Print all.",
    "3) Find by author.",
    "4) Find by name.",
    "5) Sort by name.",
    "6) Sort by author.",
    "7) Sort by publisher.",
  };
 
  unsigned int key, book_number;
  std::string author, name;
 
  std::vector<Book> books(NumberOfElements);
 
  for (auto &value : books) {
    std::cout << "Name, author, publisher, genre: ";
    std::cin >> value.name >> value.author >> value.publisher >> value.genre;
  }
 
 
  while (true) {
    for (const auto &value : items)
      std::cout << value << std::endl;
 
    std::cout << ">> ";
    std::cin >> key;
 
    switch (key) {
      case 1: 
        std::cout << "Book number: ";
        std::cin >> book_number;
        std::cout << "New name, author, publisher, genre: ";
        std::cin >> books[book_number].name      >> books[book_number].author 
                    >> books[book_number].publisher >> books[book_number].genre;
        break;
      case 2:
        for (size_t i = 0; i < NumberOfElements; ++i)
          PrintByIndex(books, i);
        break;
      case 3:
        std::cout << "Author: ";
        std::cin >> author;
        for (size_t i = 0; i < NumberOfElements; ++i)
          if (books[i].author == author)
            PrintByIndex(books, i);
        break;
      case 4:
        std::cout << "Name: ";
        std::cin >> name;
        for (size_t i = 0; i < NumberOfElements; ++i)
          if (books[i].name == name)
            PrintByIndex(books, i);
        break;
      case 5:
        std::sort(books.begin(), books.end(), [](const Book &b1, const Book &b2) { return b1.name < b2.name; });
        break;
      case 6:
        std::sort(books.begin(), books.end(), [](const Book &b1, const Book &b2) { return b1.author < b2.author; });
        break;
      case 7:
        std::sort(books.begin(), books.end(), [](const Book &b1, const Book &b2) { return b1.publisher < b2.publisher; });
        break;
 
      default:
        break;
    }
  }
}
 
void PrintByIndex(const std::vector<Book> &b, const size_t index)
{
  std::cout << "[" << index << "] "  
            << b[index].name      << " " << b[index].author << " " 
            << b[index].publisher << " " << b[index].genre << std::endl;
}