aaaa

#include <iostream>
#include <fstream>
using namespace std;

struct Book
{
    char genre;
    char author[30];
    int page;
    char title;
};
void createBINFILE(ifstream& f, ofstream& g)
{
    Book x;
    while (f>>x.genre>>x.author>>x.page>>x.title)
    {
        g.write((char*)&x, sizeof(Book));
    }
}
void functionOtbor(ifstream& f)
{
    Book x;
    int g; //1 - детектив //2 - фантастика //3- роман
    cout << "Выберите жанр\n";
    cout << "1 - детектив 2 - фантастика 3 - роман = ";
    cin >> g;
    switch (g)
    {
    case 1:
        while (f.peek()!=EOF)
        {
            f.read((char*)&x, sizeof(Book));
            if (x.genre == 'd')
            {
                cout << x.author << " " << x.page << "\n";
            }
        }
        break;
    case 2:
        while (f.peek() != EOF)
        {
            f.read((char*)&x, sizeof(Book));
            if (x.genre == 'f')
            {
                cout << x.author << " " << x.page << "\n";
            }
        }
        break;
    case 3:
        while (f.peek() != EOF)
        {
            f.read((char*)&x, sizeof(Book));
            if (x.genre == 'n')
            {
                cout << x.author << " " << x.page << "\n";
            }
        }
        break;
    }
}

int main()
{
    setlocale(LC_ALL, "RU");
    ifstream intxt("book.txt");
    ofstream outbin("booksbin.bin", ios::binary);
    createBINFILE(intxt, outbin);
    intxt.close();
    outbin.close();
    ifstream inbin("booksbin.bin", ios::binary);
    functionOtbor(inbin);
    inbin.close();

    return 0;
}