Chapter 11

Question 1

True or False:
The private members of a base class can be directly accessed by a derived class.

Answer 1

false

Question 2

True or False:
A derived class cannot directly access public members of a base class.

Answer 2

False

Question 3

True or False:
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.

Answer 3

True

Question 4

True or False:
The constructors of a derived class can directly initialize only the public data members inherited from the base class of the derived class.

Answer 4

True

Question 5

True or False:
A call to the base class’s constructor is specified in the heading of the definition of a derived class constructor.

Answer 5

True

Question 6

True or False:
The class io is the base class of the C++ istream and ostream.

Answer 6

False

Question 7

True or False:
A derived class can directly access the protected members of the base class.

Answer 7

True

Question 8

True or False:
In protected inheritance, public and protected members of the base class become protected members of the derived class.

Answer 8

True

Question 9

True or False:
If inheritance is private, all members of the base class, including private members, become private members of the derived class.

Answer 9

False

Question 10

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

Answer 10

is-a

Question 11

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

Answer 11

encourages code reuse

Question 12

___________ is a “has-a” relationship.

Answer 12

Composition

Question 13

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

Answer 13

base

Question 14

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

Answer 14

class dClass: private bClass
{
//classMembersList
};

Question 15

Consider the following class definition:
class dClass: private bClass
{
//classMembersList
};
The class dClass is derived from the class bClass using the _______ type of inheritance.

Answer 15

private

Question 16

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

Answer 16

class bClass: public aClass
{
//…
};

Question 17

Which of the following is true about inheritance?

Answer 17

The public members of the base class become the public or private member variables 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?

Answer 18

class bClass: public aClass
{
//…
};

Question 19

Which of the following is true about a derived class?

Answer 19

A derived class can redefine any public member function of the base class.

Question 20

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.

Answer 20

redefine

Question 21

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.

Answer 21

overloaded

Question 22

Consider the following class definitions:
class bClass
{
public:
void setX(int);
void print() const;
private:
int x;
};
class dClass: public bClass
{
public:
void setXY(int, int);
void print() const;
private:
int y;
};
Which of the following statements correctly redefines the member function print of bClass?

Answer 22

void dClass::print() const
{
bClass::print();
cout &laquo_space;“y = “ &laquo_space;y &laquo_space;endl;
}

Question 23

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 must use the statement _________.

Answer 23

classB::functionName();

Question 24

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

Answer 24

The public members of the base class become protected members of the derived class.

Question 25

Consider the following class definitions:
class bClass{
public:
void setX(int a);
void print() const;
private:
int x;
};
class dClass: public bClass{
public:
void setXY(int a, int b);
void print() const;
private:
int y;
};
Which of the following correctly sets the values of x and y?

Answer 25

void dClass::setXY(int a, int b){
bClass::setX(a);
y = b;
}

Question 26

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

Answer 26

encapsulation

Question 27

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

Answer 27

Polymorphism

Question 28

OOP implements ________.

Answer 28

OOD

Question 29

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

Answer 29

virtual

Question 30

The ______ members of an object form its internal state.

Answer 30

private

Question 31

The ________members of an object form its external state.

Answer 31

public

Question 32

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

Answer 32

private

Question 33

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

Answer 33

ifndef

Question 34

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

Answer 34

protected

Question 35

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

Answer 35

composition

Question 36

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

Answer 36

objects

Question 37

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

Answer 37

vitrual