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#include <iostream>
#include <string.h>
#include <vector>
#include <math.h>

using namespace std;

// our structure for sending data
struct MY_DATA {
	unsigned char packet_id;
	int latitude;
	int longitude;
	unsigned short heading;
};

int main() {
	// fill a struct with data
	MY_DATA data_to_send;
	data_to_send.packet_id = 0x01;
	data_to_send.latitude = (int) (42.358456 * pow(10,7));
	data_to_send.longitude = (int) (-71.087589 * pow(10,7));
	data_to_send.heading = 185;

	// construct our array/vector and fill it with data
	vector<unsigned char> packet (sizeof(data_to_send), 0);
	memcpy(&packet[0], &data_to_send.packet_id, sizeof(data_to_send));

	// to get our data out, do the reverse
	MY_DATA data_received;
	memcpy(&data_received.packet_id, &packet[0], sizeof(data_to_send));

	// print out the data
	cout << "packet id: 0x" << hex << (int) data_received.packet_id << dec << endl;
	cout << "lat: " << data_received.latitude / pow(10,7) << endl;
	cout << "lon: " << data_received.longitude / pow(10,7) << endl;
	cout << "heading: " << data_received.heading << endl;

	return 0;
}