Programming in Objective-C, Sixth Edition

Exercises

1. Extend the MathOps category from Program 11.1 to also include an invert method, which returns a Fraction that is an inversion of the receiver.

2. Add a category to the Fraction class called Comparison. In this category, add two methods according to these declarations:

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-(BOOL) isEqualTo: (Fraction *) f;-(int) compare: (Fraction *) f;

The first method should return YES if the two fractions are identical and should return NO otherwise. Be careful about comparing fractions. (For example, comparing 3/4 to 6/8 should return YES.)

The second method should return –1 if the receiver compares less than the fraction represented by the argument, return 0 if the two are equal, and return 1 if the receiver is greater ...