Работа с файлами и структурами. Создать "меню"

#include <iostream>
#include <iterator>
#include <vector>
#include <string>
#include <string.h>
#include <algorithm>
#include <fstream>
#include <time.h>
struct Date {
    int day;
    int month;
    int year;
};
const int MAX_FIRSTNAME = 100;
const int MAX_LASTNAME = 200;
const int MAX_PHONE = 20;
struct Abonent {
    char firstName[ MAX_FIRSTNAME ];
    char lastName[ MAX_LASTNAME ];
    Date birthDay;
    int age;
    char phone[ MAX_PHONE ];
};
void countAge( Abonent & abonent ) {
    time_t rawtime;
    time ( &rawtime );
    tm current = *(localtime( &rawtime ));
    abonent.age = current.tm_year - abonent.birthDay.year;
}
bool operator==( const Abonent & left, const Abonent & right ) {
    return std::string( left.firstName ) == std::string( right.firstName ) &&
           std::string( left.lastName ) == std::string( right.lastName );
}
std::ostream & operator<<( std::ostream & os, const Abonent & abonent ) {
    Abonent abonentForAge = abonent;
    countAge( abonentForAge );
    os << abonent.firstName << " " << abonent.lastName << ":" << std::endl;
    os << "    birthDay : " << abonent.birthDay.day << "." << abonent.birthDay.month << "." << abonent.birthDay.year << std::endl;
    os << "    age : " << abonentForAge.age << std::endl;
    os << "    phone : " << abonent.phone << std::endl;
    return os;
}
typedef std::vector< Abonent > AddressBook;
void addAbonent( AddressBook & addressBook, const Abonent & abonent ) {
    Abonent abonentToAdd = abonent;
    countAge( abonentToAdd );
    addressBook.push_back( abonentToAdd );
}
void addAbonent( AddressBook & addressBook, const char * firstName, const char * lastName, int day, int month, int year, const char * phone ) {
    Abonent abonent;
    strcpy( abonent.firstName, firstName );
    strcpy( abonent.lastName, lastName );
    abonent.birthDay.day = day;
    abonent.birthDay.month = month;
    abonent.birthDay.year = year;
    strcpy( abonent.phone, phone );
    addAbonent( addressBook, abonent );
}
void deleteAbonent( AddressBook & addressBook, const Abonent & abonent ) {
    AddressBook::iterator found = std::find( addressBook.begin(), addressBook.end(), abonent );
    if ( found != addressBook.end() ) {
        addressBook.erase( found );
    }
}
void printAddressBook( const AddressBook & addressBook ) {
    std::copy( addressBook.begin(), addressBook.end(), std::ostream_iterator< Abonent >( std::cout, "\n" ) );
}
void saveAddressBookToFile( const AddressBook & addressBook, const char * fileName ) {
    std::ofstream file( fileName, std::ofstream::binary );
    if ( ! file ) {
        return;
    }
    for ( AddressBook::const_iterator it = addressBook.begin(), end = addressBook.end(); it != end; ++it ) {
        file.write( (char*)&(*it), sizeof( *it ) );
    }
}
void loadAddressBookFromFile( AddressBook & addressBook, const char * fileName ) {
    std::ifstream file( fileName, std::ofstream::binary );
    if ( ! file ) {
        return;
    }
    Abonent abonent;
    while ( ! file.eof() ) {
        file.read( (char*)&abonent, sizeof( abonent ) );
        if ( ! file.fail() ) {
            addAbonent( addressBook, abonent );
        }
    }
}
int main()
{
    AddressBook book;
    addAbonent( book, "Freddy", "Kruger", 1, 11, 1980, "911" );
    addAbonent( book, "Arnold", "Schwartz(enough...)", 2, 6, 1960, "+009876543210" );
    
    printAddressBook( book );
    Abonent freddy;
    strcpy( freddy.firstName, "Freddy" );
    strcpy( freddy.lastName, "Kruger" );
    deleteAbonent( book, freddy );
    
    std::cout << "freddy deleted:" << std::endl;
    printAddressBook( book );
}