#include <iostream>
#include <string  >
#include <fstream >


struct User
{
    std::string username; // this is the problem
//  char        username[50]; // this works fine
    int         password;

};

int main()
{
    std::ofstream out("data.dat", std::ios::binary | std::ios::out | std::ios::app);
    User theUser;

    std::cout << "username: ";
    std::getline(std::cin, theUser.username);
    std::cin.ignore(1, 'n');
    std::cout << "password: ";
    std::cin >> theUser.password;
    std::cout << std::endl;
    std::cin.ignore(1, 'n');

    out.write((char*)&theUser, sizeof(theUser));
    out.flush();


    out.close();

    std::ifstream in("data.dat", std::ios::binary | std::ios::in);

    User theUser2;

    in.seekg(0, std::ios::end);
    int nUser = in.tellg() / sizeof(User);
    in.clear();
    in.seekg(0, std::ios::beg);

    std::cout << "nUser: " << nUser << std::endl;
    std::cout << "Reading now...nn";

    for(int i(0); i < nUser; i++)
    {
        if(in.is_open())
        {
            in.read((char*)&theUser2, sizeof(User));
            std::cout << "username: " << theUser2.username << std::endl;
            std::cout << "password: " << theUser2.password << std::endl;
        }
    }

    in.close();

    std::cout << std::endl;
    return 0;
}