// Pay calculator
// Version 2.1
//
// New in this version: Time is now a class with methods.

#include <fstream>
using std::ifstream;
using std::ofstream;
#include <iomanip>
using std::fixed;
using std::setprecision;
#include <iostream>
using std::cout;
using std::cin;
using std::istream;
using std::ostream;
#include <string>
using std::string;

const double kPayRate = 12;

class Time
{
public:
    void initialize()
    {
        hours = minutes = 99;
    }

    void read(istream & in)
    {
        in >> hours;
        in.get(); // colon
        in>> minutes;
    }

    void print(ostream & out)
    {
        out << hours << ':';
        if (minutes < 10) out << 0;
        out << minutes;
    }

    double minus(const Time & t2)
    {
        return (hours + minutes/60.0) -
            (t2.hours + t2.minutes/60.0);
    }

private:
    int hours;
    int minutes;
};


int main()
{
    cout << "Name of input file: ";
    string input_file_name;
    getline(cin, input_file_name);

    ifstream ifs_input(input_file_name);
    if (!ifs_input) {
        cout << "Could not open file.\n";
        return 1;
    }

    cout << "Name of output file: ";
    string output_file_name;
    getline(cin, output_file_name);

    ofstream ofs_output(output_file_name);
    if (!ofs_output) {
        cout << "Could not open output file.\n";
        return 1;
    }

    int employee_number;
    while (ifs_input >> employee_number) {
        Time start_time;
        start_time.read(ifs_input);

        Time stop_time;
        stop_time.read(ifs_input);

        double pay = stop_time.minus(start_time) * kPayRate;

        ofs_output << employee_number << ' ';
        start_time.print(ofs_output);
        ofs_output << ' ';
        stop_time.print(ofs_output);
        ofs_output << " $" << fixed << setprecision(2) << pay
                   << '\n';
    }

    return 0;
}