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Chapter 15: Problem 3
A class with at least one pure virtual member function is called a(n) _________ class.
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The is-a relation between classes is best implemented using the mechanism of class _________.
The ability of code to execute differently depending on the type of data is called _________.
Write a C++ class that has an array of integers as a member variable, a pure virtual member function bool compare(int \(x, \text { int } y)=0\) that compares its two parameters and returns a boolean value, and a member function void sort () that uses the comparison defined by the compare virtual function to sort the array. The sort function will swap a pair of array elements a \([\mathrm{k}]\) and a \([\text { j }]\) if \\[ \text { compare }(a[k], a[j]) \\] returns true. Explain how you can use this class to produce classes that sort arrays in ascending order and descending order.
Suppose that the classes Dog and cat derive from Animal, which in turn derives from Creature. Suppose further that pDog, pCat, pAnimal, and pCreature are pointers to the respective classes. Suppose that Animal and creature are both abstract classes. Will the statement pCreature \(=\) new Dog; compile?
Suppose that you need to have a class that can sort an array in ascending order or descending order upon request. If an array is already sorted in ascending or descending order, you can easily sort it the other way by reversing it. Now suppose you have two different classes that encapsulate arrays. One provides a member function to reverse its array, while the other provides a member function to sort its array. Can you use multiple inheritance to obtain a quick solution to your problem? Should you? Write a couple of paragraphs explaining whether using multiple inheritance will or will not work to solve this problem, and, if it can, whether this is a good way to solve the problem.
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