The class has the following contructors and methods:
* A default constructor that sets the rational numbers to 0/1
* A constructor that has parameters for the numerator and denominator and converts the resulting ratio to simplified form.
* simplify--a private method that converts the rational numbers to simplified form.
* geGCD (x, y )--a private static method that returns the largest common factor of the two positive integers x and y, that is, their greatest common divisor. For example, the greatest common divisor of 40 and 12 is 4.
* getValue--returns the rational number as a double value.
* toString--returns the rational number as a string in the form a/b.
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