/* A restartable timer.  start() and stop() work in the obvious way.
   reset() stops the timer and resets it to zero.  in_ms() and in_seconds()
   read the current value of the timer (whether it is running or not). */

class Timer {
    private long time;
    private boolean running;

    public inline void reset() { time = 0; running = false; }

    public inline void start() {
	running = true;
	time -= System.currentTimeMillis();
    }
    public inline void stop() {
	running = false;
	time += System.currentTimeMillis();
    }
    public inline long in_ms() {
	return (running ? (System.currentTimeMillis() + time) : time);
    }
    public inline double in_seconds() {
	return in_ms() / 1000.0d;
    }
}