// Add this rational number to another fraction.
// note: not simplified
public Fraction add(Fraction other) throws Exception {
Fraction ans =
new Fraction(
(this.num.multiply(other.denom).add(this.denom.multiply(other.num))),
this.denom.multiply(other.denom));
return ans.simplify();
} // add(fraction)
// multiplies this and another fraction
public Fraction multiply(Fraction mult) throws Exception {
Fraction ans = new Fraction(this.num.multiply(mult.num), this.denom.multiply(mult.denom));
return ans.simplify();
} // multiply(int)