#include <iostream>
#include <iomanip>
#include <fstream>
#include <cstdlib>
#include <string>
using namespace std;

int main()
{
    string filename("djia.txt");
    ifstream fin(filename);
    if (!fin.is_open())
    {
        cerr << "Cannot open " << filename << endl;
        exit(1);
    }

    string outputfilename("djia_without_commas.txt");
    ofstream fout(outputfilename);
    if (!fout)
    {
        cerr << "Cannot open " << outputfilename << endl;
        exit(2);
    }

    char ch;
    float open, close, gain;
    string dummy;

    while (!fin.eof())
    {
        ch = fin.get();
        if (ch != ',')
            fout << ch;
    }

    fin.close();
    fout.close();

    fin.open(outputfilename);
    if (!fin.is_open())
    {
        cerr << "Cannot open " << outputfilename << endl;
        exit(4);
    }

    cout << setprecision(2) << fixed << boolalpha;
    while (fin.get() != '\n') ;

    float totalgain = 0;
    int count = 0;

    while (!fin.eof())
    {
        fin >> dummy >> dummy >> dummy >> open >> dummy >> dummy >> close >> dummy >> dummy;
        if (fin.eof())
            break;

        if (count == 5)
            break;
        gain = close - open;
        cout << open << ' ' << close << ' ' << gain << ' ' << fin.good() << endl;
        totalgain += gain;
        count++;
    }
    cout << "Average gain is $" << totalgain/count << endl;
}