Chapter 15: Problem 12
A collection of abstract classes defining an application in skeletal form is called a(n) _________.
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If every C1 class object can be used as a C2 class object, the relationship between the two classes should be implemented using _________.
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. Rewrite the following two statements to get them to compile correctly. \\[ \begin{array}{l} \text { pAnimal = new Dog; } \\ \text { pDog = pAnimal; } \end{array} \\]
The is-a relation between classes is best implemented using the mechanism of class _________.
A class that cannot be instantiated is a(n) _________.
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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