// Time class
// Version 1.2
//
// New in this version: constructors.

#include <iostream>
using std::cout;
using std::cin;
using std::istream;
using std::ostream;

class Time
{
public:
//    Time() : hours(99), minutes(99) {}
//    Time(int h) : hours(h), minutes(0) {}
//    Time(int h, int m) : hours(h), minutes(m) {}

    Time() : Time(99, 99) {}
    Time(int h) : Time(h, 0) {}
    Time(int h, int m) : hours(h), minutes(m) {}

//    Time() {}
//    Time(int h) : Time(h, 0) {}
//    Time(int h, int m) : hours(h), minutes(m) {}

    void read(istream & in);
    void print(ostream & out) const;
    double minus(const Time & t2) const;

private:
    int hours;
    int minutes;

//    int hours = 99;
//    int minutes = 99;
};

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

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

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

void println(const Time & t, ostream & out)
{
    t.print(out);
    out << '\n';
}

int main()
{
    Time t;
//    t.initialize();
    println(t, cout);

    Time wake_up_time(6,15);
    println(wake_up_time, cout);

    Time noon(12);
    println(noon, cout);

//    Time six_thirty(6,30);
//    wake_up_time = six_thirty;

    wake_up_time = Time(6,30);
    println(wake_up_time, cout);

//    wake_up_time = Time(6);
    wake_up_time = 6;
    println(wake_up_time, cout);

    Time midnight = 0;
    println(midnight, cout);

    Time a_times[5];
    for (const Time & t : a_times) println(t, cout);

    return 0;
}