@Override
	public boolean equals(Object r) {
		if(this == r) {
			return true;
		}
		if (null == r) {
			return false;
		}
		if (!(r instanceof RatNum)) {
			return false;
		} else {
			RatNum r2 = (RatNum) r;
			if (this.num == r2.num && this.den == r2.den) {
				return true;
			} else {
				return false;
			}
		}
	}