#include <fstream>
#include <string>
#include <iostream>
#include <stdlib.h>

using namespace std;

struct MyStruct
{
    float a,b,c;
    int d;
    char msg[256];
};

void print_struct( MyStruct *s )
{
    std::cout << "a,b,c :" << s->a << ", " << s->b << ", " << s->c << endl;
    std::cout << "d :" << s->d << endl;
    std::cout << "msg :" << s->msg << endl;

}

void save()
{
    std::ofstream fout("struct.dat", std::ios::binary);
    if(fout.bad())
    {
            fout.close();
            return;
    }

    MyStruct mydata;
    mydata.a = 3.14159;
    mydata.b = 6.28;
    mydata.c = 2.73;
    mydata.d = 42;
    // Format a string...
    sprintf_s( (char*)&mydata.msg,256, "hi there :) " );


    fout.write((char*) &mydata, sizeof(MyStruct));
}

MyStruct* load()
{
    std::ifstream fin("struct.dat", std::ios::binary);
    if(fin.bad())
    {
            fin.close();
            return NULL;
    }

    MyStruct *mydata = new MyStruct;

    fin.read((char*) mydata, sizeof(MyStruct));
    return mydata;
}

int main()
{
    cout << "[s]ave or [l]oad? " << endl;
    char choice = ' ';
    cin >> choice;
    if (choice == 's')
    {
        save();
    }else{
        MyStruct *s;
        s = load();

        // if loading the struct failed, its pointer will be NULL
        if (s)
        {
            print_struct( s );
            delete s;
        }else{
            cout << "failed to load struct" << endl;
        }
    }


    return 0;
}