An operator

1.

Write a method called toDouble that converts the rational number to a double (floating-point number) and returns the result. This method is a pure operator; it does not modify the object. As always, test the new method.

2.

Write a method called commonDivisor that finds the greatest common divisor of the numerator and the denominator. Appendix A provides an algorithm for finding the GCD. Remember that commonDivisor is an operator; it should not modify the instance variables of the object on which it is invoked.