Deck 11: Inheritance and Composition

Question 1

Which of the following is true about inheritance?

A) All public member functions of the base class become the public member functions of the derived class.
B) All public member variables of the base class become the public member variables of the derived class.
C) All public members of the base class become the public members of the derived class.
D) The public member variables of the base class become the public or private member variables of the derived class.

Answer 1

D

Question 2

Consider the following class definition: The class dClass is derived from the class bClass using the ____ type of inheritance.

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

Answer 2

B

Question 3

The constructors of a derived class can (directly) initialize only the (public data) members inherited from the base class of the derived class.

Answer 3

True

Question 4

Existing classes, from which you create new classes, are called ____ classes.

A) child
B) base
C) sibling
D) derived

Question 5

A derived class can directly access the protected members of the base class.

Question 6

The private members of a base class can be directly accessed by a derived class.

Question 7

Classes can create new classes from existing classes.This important feature ____.

A) encourages code reuse
B) aids the separation of data and operations
C) provides public access to the internal state of an object
D) results in more software complexity

Question 8

A call to the base class's constructor is specified in the heading of the definition of a derived class constructor.

Question 9

The class io is the base class of the C++ stream classes istream and ostream.

Question 10

In protected inheritance, public and protected members of the base class become the protected members of the derived class.

Question 11

A derived class cannot directly access public members of a base class.

Question 12

If the derived class does not override a public member function of the base class, you may specify a call to that public member function by using the name of the function and the appropriate parameter list.

Question 13

The new classes that we create from existing classes are called ____ classes.

A) sibling
B) base
C) derived
D) parent

Question 14

Which of the following is a valid definition of the derived class bClass?

Question 15

Inheritance is an example of a(n) ____ relationship.

A) is-a
B) has-a
C) handshaking
D) had-a

Question 16

In multiple inheritance, the derived class has more than one base class.

Question 17

If inheritance is private, all members of the base class, including private members, become private members of the derived class.

Question 18

Which of the following class definitions makes the public members of the class aClass become the public members of the class bClass?

Question 19

____ is a "has-a" relationship.

A) Inheritance
B) Encapsulation
C) Composition
D) Polymorphism

Question 20

Suppose that bClass is a class.Which of the following statements correctly derives the class dClass from bClass?

Question 21

To ____ a public member function of a base class in the derived class, the corresponding function in the derived class must have the same name, number, and types of parameters.

A) redefine
B) overload
C) rename
D) reuse

Question 22

The ____ members of an object form its internal state.

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

Question 23

In OOD, a program is a collection of interacting ____________________; in structured programming, a program is a collection of interacting functions.

Question 24

____ is the ability to combine data, and operations on that data, in a single unit.

A) Inheritance
B) Encapsulation
C) Polymorphism
D) Composition

Question 25

Consider the following class definitions:Which of the following statements correctly redefines the member function print of bClass?

Question 26

Which of the following statements about inheritance is true if memberAccessSpecifier is protected?

A) The private members of the base class become protected members of the derived class.
B) The derived class can directly access any member of the base class.
C) The public members of the base class become protected members of the derived class.
D) The protected members of the base class become private members of the derived class.

Question 27

The preprocessor directive ____________________ is used to prevent multiple inclusions of a header file in a program.

Question 28

In ____________________ (aggregation), one or more members of a class are objects of another class type.

Question 29

What is the output of the following program?

Question 30

The constructor of a derived class cannot directly access the ____________________ member variables of the base class.

Question 31

If the corresponding functions in the base class and the derived class have the same name but different sets of parameters, then this function is ____ in the derived class.

A) reused
B) redefined
C) overloaded
D) overridden

Question 32

____ is the ability to use the same expression to denote different operations.

A) Inheritance
B) Encapsulation
C) Polymorphism
D) Composition

Question 33

Which of the following is true about a derived class?

A) A derived class can directly access any member variable of the base class.
B) A derived class can redefine any public member function of the base class.
C) A derived class can have at most one base class.
D) A derived class can redefine any member function of the base class.

Question 34

Consider the following class definitions:Which of the following dClass constructor definitions is valid in C++?

Question 35

The ____ members of an object form its external state.

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

Question 36

C++ provides ____ functions as a means to implement polymorphism in an inheritance hierarchy, which allows the run-time selection of appropriate member functions.

A) redefined
B) overridden
C) virtual
D) overloaded

Question 37

Consider the following class definitions:Which of the following correctly sets the values of x and y?

Question 38

If the derived class classD overrides a public member function functionName of the base class classB, then to specify a call to that public member function of the base class, you use the statement ____.

A) classD::functionName();
B) classB::functionName();
C) classD.functionName();
D) classB.functionName();

Question 39

OOP implements ____.

A) UML
B) IPE
C) EIP
D) OOD

Question 40

If inheritance is public, all protected members of the base class are ____________________ members of the derived class.

Question 41

C++ provides ____________________ functions as a means to implement polymorphism in an inheritance hierarchy.