C++ help: File streams - Printable Version

Code:
// ENGG 233 Lab9 - Task 2

#include <iostream>

#include <fstream>

#include <vector>

using namespace std;



// Initialize a struct for the data point

struct DataPoint

{

    string date;

    double latitude;

    double longitude;

    double magnitude;

    string location;

};



int main()

{

    // Create a vector of DataPoint structs to store the input

    vector<DataPoint> inputData(0);



    // Initialize a variable for the input file

    string inFilename;



    // Prompt the user to enter the filename of the input file

    cout << "Please enter the filename of the text file you wish to be read in, and include the file extension: ";

    cin >> inFilename;



    // Opens the file specified by the user

    ifstream in_file;

    in_file.open(inFilename);



    // If the file fails to open, the program terminates

    if(in_file.fail())

    {

        cout << "The file you are trying to open does not exist." << endl;

        return 0;

    }



    else

    {

        // Read until the end of the file

        while (!in_file.eof())

        {

            // Initialize a variable for the current input struct

            DataPoint readInput;



            // Read the input

            in_file >> readInput.date >> readInput.latitude >> readInput.longitude >> readInput.magnitude >> readInput.location;



            // Read the input into a new struct in the vector

            inputData.push_back(readInput);

        }

    }

    // Close the input file, as it is no longer needed

    in_file.close();



    // Create the output file

    ofstream out_file;

    out_file.open("earthquakeInformationSystem.kml");



    // Write the header code into the kml file

    out_file << "<?xml version=\"1.0\" encoding=\"UTF-8\"?>" << endl

            << "<kml xmlns=\"http://opengis.net/kml/2.2\">" << endl

            << "<Document>";



    // Make sure the size of inputData is stored as an integer to prevent unsigned vs. signed comparison

    int vectorSize = inputData.size();



    // Repeat inserting this code for each location

    for(int sentinel = 0; sentinel < vectorSize; sentinel++)

    {

        out_file << "   <Placemark>" << endl << "<name>"

                << inputData[sentinel].location << ", "

                << inputData[sentinel].magnitude << ", "

                << inputData[sentinel].date << "</name>" << endl

                << "      <Point>" << endl << "         <coordinates>"

                << inputData[sentinel].longitude << ","

                << inputData[sentinel].latitude << ",0</coordinates>"

                << "      </Point>" << endl << "   </Placemark>" << endl;

    }



    // Input the footer of the code

    out_file << "</Document>" << endl << "</kml>";



    // Close the output file

    out_file.close();

    return 0;

}