// B39HV2 Software Engineering II
// Unit 2 Exercise 1


import java.io.*;

public class Clock {
  
    public Clock(int h, int m, int s)
    {
	hour=h;
	minute=m;
	second=s; 
	normalise();
    }
	
    // Core of methods
    
    public void tick() {
	second = second + 1;  // Add one second;
	normalise();
    }

    public void show_time() {
	System.out.println(hour+":"+minute+":"+second);
    }

    public void normalise() {
	minute = minute + second / 60; // change minute if second > 60
	hour = hour + minute/60;       // change hour if minute > 60
	minute = minute%60;            // modulo 60 minutes             
	hour = hour%24;                // modulo 24 hours
	second = second%60;            // modulo 60 seconds
    }

    private int hour,minute, second; // Private data of class
};