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Chapter 15: Problem 2

A member function of a class that is not implemented is called a(n) _________ function.

Short Answer

Expert verified
Answer: Pure virtual function

Step by step solution

01

Understanding Classes and Member Functions

In object-oriented programming, a class is a blueprint for creating objects. Objects are instances of a class, and they have attributes and methods (functions) associated with them. Member functions are methods that belong to a class and operate on the attributes (data members) of the class. For example, in a `Person` class, there might be member functions like `get_name()` or `get_age()`.
02

Identify the Term for an Unimplemented Function

When defining a class, sometimes it is useful to declare a member function without providing its implementation. This means that the function can be part of the class interface, but its implementation is left for derived classes (derived classes are classes that inherit from the base class). A member function that does not have an implementation is called a(n) "pure virtual" function. So, the answer to the exercise is: A member function of a class that is not implemented is called a(n) "pure virtual" function.

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Most popular questions from this chapter

A class with at least one pure virtual member function is called a(n) _________ class.

A collection of abstract classes defining an application in skeletal form is called a(n) _________.

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?

The is-a relation between classes is best implemented using the mechanism of class _________.

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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