/**
 * A simple class to model a clock
 */
public class Clock {
	// hours, minutes and seconds
	// of the clock
	private int h, m, s;

	/**
	 * Adds 1 second to the current time of the clock
	 */
	public Clock tick() {
		s++;
		if (s == 60) {
			m++;
			s = 0;
			if (m == 60) {
				h++;
				m = 0;
			}
		}
		return this;
	}

	/**
	 * Returns a string representation of the time of the clock
	 */
	public String toString() {
		return h + "hrs " + m + "mins " + s + "secs";
	}
}