The Rational class in this chapter is defined as a subclass of java.lang.Number. Which of the following expressions is correct?
a. Rational.doubleValue();
b. Rational.doubleValue("5/4");
c. new Rational(5, 4).doubleValue();
d. new Rational(5, 4).toDoubleValue();
e. new Rational(5, 4).intValue();
ce A is wrong, because the doubleValue() method is an instance method. B is wrong for two reasons: 1 . the doubleValue() method is an instance method; 2 . the doubleValue() method does not have arguments. D is wrong becasue there is no method named toDoubleValue().
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