Deck 10: Understanding Inheritance

Question 1

A(n) ____ is a very specific instance of a class.

A) superclass
B) derived class
C) object
D) child class

Answer 1

C

Question 2

When a class serves as a base class to other classes, all of its members are included when you create an object from a derived class. However, the members of the base class that are ____ are not directly accessible from within the child class functions.

A) public
B) protected
C) private
D) virtual

Answer 2

C

Question 3

____ data and functions can be accessed only by class functions, or by functions in child classes.

A) public
B) protected
C) private
D) virtual

Answer 3

B

Question 4

To create a class Customer that derives from the class Person , you should use the following syntax:
Class Customer ____ public Person // public may be replaced
// by another class access
// specifier
{
// other statements go here
};

A) :
B) extends
C) ::
D) ->

Question 5

When a class is a base class you are required to define data as protected rather than private .

Question 6

____ is based on the principle that knowledge of a general category can be applied to more specific objects.

A) Overloading
B) Inheritance
C) Overriding
D) Polymorphism

Question 7

The children of a virtual base class cannot be used as a base to another class.

Question 8

A ____ function cannot be inherited.

A) virtual
B) friend
C) public
D) protected

Question 9

____ data and functions can be accessed only within a class.

A) public
B) protected
C) private
D) virtual

Question 10

Any child class function with the same name as the parent, yet with an argument list that differs from the parent's, ____ the parent function.

A) specializes
B) generalizes
C) overloads
D) overrides

Question 11

The three access specifiers available for class members in C++ are: public , private and ____.

A) virtual
B) restricted
C) friend
D) protected

Question 12

Any child class function with the same name and argument list as the parent ____ the parent function.

A) specializes
B) generalizes
C) overloads
D) overrides

Question 13

No matter which access specifier you use when creating a child class, access to parent class members never becomes more lenient than originally coded.

Question 14

To be truly "object-oriented," a programming language must allow inheritance.

Question 15

The ____ access specifier allows members to be used by class member functions and by derived classes, but not by other parts of a program.

A) protected
B) virtual
C) private
D) friend

Question 16

C++ programmers usually use the ____ access specifier for inheritance.

A) public
B) protected
C) private
D) friend

Question 17

____ data and functions can be accessed anywhere the class is in scope.

A) public
B) protected
C) private
D) virtual

Question 18

A derived class is also called a subclass or descendant.

Question 19

Class friendship is not inherited.

Question 20

Inheritance is said to use the ____ relationship.

A) "has a"
B) "extends"
C) "is a"
D) "specializes"

Question 21

Why are functions sometime overridden in derived classes?

Question 22

Multiple inheritance is ____ required.

A) always
B) never
C) rarely
D) frequently

Question 23

When a derived class object is destroyed, the ____________________ class destructor is called first.

Question 24

When a child class function overrides a parent class function, you can say that you have ____________________ the function.

Question 25

The following code is an example of the correct use of the virtual keyword (assume Student is a subclass of Person ): ____.

A) virtual public Person
B) class Student : public Person (virtual)
C) virtual class Student : public Person
D) class Student : virtual public Person

Question 26

A(n) ____________________ class is also called the superclass, or ancestor.

Question 27

Many of the constructor complications that occur when inheriting from multiple classes are minimized if you always include ____.

A) a default constructor for every class
B) the virtual keyword when declaring the parent class
C) a friend function
D) an specialized destructor

Question 28

When you instantiate a class object that has been derived from another class, ____.

A) the constructor for the base class is called first, followed by the derived class constructor
B) the constructor for the derived class is called first, followed by the base class constructor
C) only the constructor for the derived class is called
D) only the constructor for the base class is called

Question 29

Overriding a base class member function with a derived member function demonstrates the concept of ____.

A) abstraction
B) polymorphism
C) inheritance
D) overloading

Question 30

____________________ in C++ means you can create classes that derive their attributes from existing classes.

Question 31

Provide an example of a situation in which you would want to use inheritance when creating classes.

Question 32

If a base class contains a function that the derived class should not have, you can create a ____________________ function with the same name in the derived class.

Question 33

With respect to inheritance, what do generalization and specialization mean?

Question 34

Consider the following code segments:
class Person
{
private:
int idNum;
string lastName;
string firstName;
public:
void setFields(int, string, string);
void outputData();
};
class Customer : public Person
{
private:
double balanceDue;
public:
void setBalDue(double);
void outputBalDue();
};
void Customer::outputBalDue()
{
cout
What error does the outputBalDue() function have?

Question 35

What are the advantages provided by inheritance?

Question 36

Why does inheritance save you time?

Question 37

Consider an object aWorker of class Worker , and a variable aPerson of class Person , where Worker is a subclass of Person . Which of the following is valid without writing a specialized function?

A) aPerson + aWorker
B) aPerson * aWorker
C) aWorker = aPerson
D) aPerson = aWorker

Question 38

If you do not use an access specifier when you create a derived class, access is ____________________ by default.

Question 39

What should be the first line of the class declaration for the class RV that is both a Vehicle and a Dwelling ?

A) class RV : public Vehicle && public Dwelling
B) class RV : public Vehicle and implements public Dwelling
C) class RV : public Vehicle, public Dwelling
D) class RV : public Vehicle Dwelling

Question 40

When you define a derived class, you can insert one of the three class access specifiers just prior to the ____________________ name.

Question 42

What happens if a derived class uses the protected access specifier for inheritance?

Question 43

What are the items that are never inherited by a child class?

Question 45

Can you create an array of parent class objects and store child class objects in it? What happens when you do this?

Question 46

Consider the following code fragments:
class PetStoreItem
{
protected:
int stockNum;
double price;
public:
PetStoreItem(int, double);
};
class PetStoreAnimal : public PetStoreItem
{
protected:
int petAge;
public:
PetStoreAnimal(int);
};
PetStoreAnimal::PetStoreAnimal(int age)
{
petAge = age;
}
Change the PetStoreAnimal constructor to avoid getting an error.