Cardealership loop

#include <string>
#include <iostream>
#include <fstream>
#include <iomanip>

using namespace std;

int main()
{

    ifstream infile;
    ofstream outfile;
    double retailValue = 0;
    double baseValue = 0;
    double comission = 0;
    int employeeID = 0;
    int count = 0;
    double totalSales = 0;
    double totalComission = 0;
    int previousID = 0;
    double employeeComissions = 0;
    double employeeSales = 0;

    infile.open("carsales.dat");
    outfile.open("carsales.txt");
    outfile << "WEEKLY SALES REPORT: ";
    outfile << endl
            << "Employee ID / Retail Value / Comission";
    outfile << fixed << showpoint << setprecision(2);

    while (!infile.eof()) {

        infile >> employeeID >> retailValue >> baseValue;

        if (employeeID >= 100 && employeeID <= 999) {
            count++;
        }

        if ((baseValue * .3) > 100) {
            comission = baseValue * .3;
        }
        else
            comission = 100;

        if (previousID && previousID != employeeID) {
            outfile << endl
                    << "Totals for Employee ID: " << previousID << ' ' << "Total Comission: " << employeeComissions << ' ' << "Total Retail Value: " << employeeSales;
            employeeComissions = 0;
            employeeSales = 0;
        }

        outfile << endl
                << employeeID << ' ' << retailValue << ' ' << comission << ' ';

        totalSales += retailValue;
        totalComission += comission;
        previousID = employeeID;
        employeeComissions += comission;
        employeeSales += retailValue;
    }

    outfile << endl
            << "Totals for Employee ID: " << employeeID << ' ' << "Total Comission: " << employeeComissions << ' ' << "Total Retail Value: " << employeeSales;
outfile<<endl;
    outfile << endl
            << "Records: " << count;
    outfile << endl
            << "Total Sales: " << totalSales;
    outfile << endl
            << "Total Comission: " << totalComission;

    infile.close();
    outfile.close();

    return 0;
}