// demo program for comp 1672
// Implements the class Time

#include <iostream>
#include "time.h"        // header file for the time class
using namespace std;

// Default constructor
Time::Time()
{
	hour = 0;
	min = 0;
	sec = 0;
}

// Constructor that allows initialization of data values
Time::Time(int h, int m, int s)
{
	set(h, m, s);
}

// output the time to the screen
void Time::print()
{
    cout << hour << ":" << ((min < 10)?"0":"") << min << 
	   ":" << ((sec<10)?"0":"") << sec;
}

// set the time - does all appropriate error handling
// except for negative values
void Time::set(int h, int m, int s)
{
	hour = min = sec = 0;
	add_seconds(s);
	add_minutes(m);
	add_hours(h);
}

// increment hours - works on a 24 hour clock
void Time:: add_hours(int h)
{
    hour = (hour + h)%24;
}

// increment minutes - hours is updated if we end up with more than 60 minutes
void Time::add_minutes(int m)
{
    add_hours((min+m)/60);
    min = (min + m)%60;
}

// increment seconds - minutes and hours are updated appropriately
void Time::add_seconds(int s)
{
    add_minutes((sec+s)/60);
    sec = (sec+s)%60;
}