codice:
function arrotonda(num, rot)
{
	return (num + rot) - ((num + rot) % rot)
}
trace("al 5\n");
trace("3 -> "   + arrotonda(3,  5));
trace("5 -> "   + arrotonda(5,  5));
trace("7 -> "   + arrotonda(7,  5));
trace("11 -> " + arrotonda(11,  5));
trace("14 -> " + arrotonda(14,  5));
trace("15 -> " + arrotonda(15,  5));
trace("\n\nal 10\n");
trace("3 -> "   + arrotonda(3, 10));
trace("5 -> "   + arrotonda(5, 10));
trace("7 -> "   + arrotonda(7, 10));
trace("11 -> " + arrotonda(11, 10));
trace("14 -> " + arrotonda(14, 10));
trace("15 -> " + arrotonda(15, 10));