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

class Person {
    char nam[30];
    int  age;
public:
    Person(const char* n, int a) : age(a) {
        strcpy(nam,n);
    }

    void info() {
        cout << nam << " (" << age << ")" << endl;
    }
};

int main() {
    const size_t size = sizeof(Person);

    Person john("John Brown",40);
    Person mary("Mary Wiles",26);

    ofstream out("person.ob");
    out.write(reinterpret_cast<char*>(&john),size);
    out.write(                (char*) &mary ,size);
    out.close();

    char* buff1 = new char[size];
    char* buff2 = new char[size];
    ifstream in("person.ob");
    in.read(buff1,size);
    in.read(buff2,size);
    in.close();

    Person* p1 = reinterpret_cast<Person*>(buff1);
    Person* p2 =                 (Person*) buff2 ;

    p1->info();
    p2->info();

    delete [] buff1;
    delete [] buff2;
}