// Constructors

#include <iostream>
using namespace std;

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

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

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

    bool less_than(const Time& t) const
    {
        return (hours < t.hours) ||
                   (hours == t.hours && minutes < t.minutes);
    }

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

void println(const Time& t, ostream& out = cout)
{
    t.print(out);
    out << endl;
}

// Test driver for Time
int main()
{
    Time t;
    println(t);

//    Time wake_up_time(6, 30);
//    Time wake_up_time(6, 0);
//    Time wake_up_time(6);
    Time wake_up_time = 6;
    println(wake_up_time);

//    if (wake_up_time.less_than(Time(6,30)))
//    if (wake_up_time.less_than({6,30}))
//    if (wake_up_time.less_than({6}))
    if (wake_up_time.less_than(6)) {
        cout << "yes\n";
    }
    else {
        cout << "no\n";
    }

    println(Time(8, 35));
    println({8, 35}); // bad idea
    println(8); // bad idea

    Time(12, 45).print();
//    {12, 45}.print(); // does not compile
    cout << endl;

    Time a[5];
    for (const Time& t : a) {
        println(t);
    }

    return 0;
}