Ch.10

Question 1

A member function that allows the user of the class to change the value in a data member is known as

Answer 1

a mutation

Question 2

Why do you want to usually make data members private in a class?

A) so that no one can use the class
B) provide information hiding
C) ensure data integrity
D) provide data abstraction
E) B, C, and D

Answer 2

ensure data integrity
provide data abstraction.
provide information hiding.

Question 3

You specify an individual member of a struct by using

Answer 3

the dot operator

Question 4

Given the following class definition and the following member function header, which is the correct way to output the private data?

class Person
{
public:
 void outputPerson(ostream& out);
private:
 int age;
 float weight;
 int id;
};

void outputPerson(ostream& out)
{
 //what goes here?
}

Answer 4

out << age << weight << id;

Question 5

What is wrong with the following structure definition?
struct MyStruct
{
int size;
float weight;
}

Answer 5

missing semicolon

Question 6

Member functions of a class

Answer 6

may be in either section

Question 7

To assign values to a structure variable, you use the

Answer 7

assignment operator

Question 8

A class member function that automatically initializes the data members of a class is called

Answer 8

a constructor

Question 9

Data members or member functions of a class that are declared to be private

Answer 9

may only be accessed by members of the class

Question 10

Given the following class definition, how could you use the constructor to assign values to an object of this class?

class CDAccount
{
public:
 CDAccount( );
 CDAccount(float interest, float newBalance);
 float getBalance( );
 float getRate( );
 void setRate(float interest);
 void setBalance(float newBalance);
private:
 float balance, rate;
};

and the following object declaration
CDAccount myAccount;

Answer 10

myAccount = CDAccount(myRate, myBalance)

Question 11

If you design a class with private data members, and do not provide mutators and accessors, then

Answer 11

A) the class cannot be used.
B) the data cannot be changed or viewed by anyone.

Question 12

Given the following class definition, how would you declare an object of the class, so that the object automatically called the default constructor?
class ItemClass
{
public:
 ItemClass( );
 ItemClass(int newSize, float newCost);
 int getSize( );
 float getCost( );
 void setSize(int newSize);
 void setCost(float newCost);
private:
 int size;
 float cost;
};

Answer 12

ItemClass myItem;

Question 13

A data type consisting of data members and operations on those members which can be used by a programmer without knowing the implementation details of the data type is called

Answer 13

an abstract data type

Question 14

Given the following structure definition, what is the correct way to initialize a variable called today?
struct DateType
{
int day;
int month;
int year;
}

Answer 14

DateType today = {1,1,2000,0);

Question 15

If you have a class named myPersonClass, which of the following correctly declare a constructor in the class definition?

Answer 15

myPersonClass( );

Question 16

Given the following structure definitions, what is the correct way to print the person’s birth year?
struct DateType
{
int day;
int month;
int year;
}

struct PersonType
{
int age;
float weight;
DateType birthday;
}

PersonType person;

Answer 16

cout << person.birthday.year;

Question 17

Given the following class, what would be the best declaration for a mutator function that allows the user of the class to change the age?

class Wine
{
public:
Wine( );
int getAge( );
float getCost( );
private:
int age;
float cost;
}

Answer 17

void setAge(int newAge);

Question 18

Given the following class and object declaration, how would you print out the age and cost of a bottle of wine?

class Wine
{
public:
Wine( );
int getAge( );
float getCost( );
private:
int age;
float cost;
}

Wine bottle;

Answer 18

cout << bottle.getAge( ) << bottle.getCost( );

Question 19

Which part of the ADT tells the programmer using it how to use it?

Answer 19

the interface

Question 20

In a structure definition, the identifiers declared in the braces are called

Answer 20

member names

Question 21

If you have a class with a member function called display(ostream& out), that will send the values in the class to the parameter stream, and you need to call that function from within another member function, how would you call it to print the data to the screen?

Answer 21

display(cout);

Question 22

A member function that allows the user of the class to find out the value of a private data type is called a(n) ________.

Answer 22

accessor function

Question 23

A structure variable is a collection of smaller values called ________ values

Answer 23

member

Question 24

A member function that allows the user of the class to change the value of a private data type is called a ________.

Answer 24

mutator function

Question 25

The constructor of a class that does not have any parameters is called a ________ constructor

Answer 25

default

Question 26

The keyword ________ defines a structure type definition

Answer 26

struct

Question 27

When a structure contains another structure variable as one of its members, it is known as a

Answer 27

hierarchical structure

Question 28

What can a constructor return?

Answer 28

nothing

Question 29

In the following class constructor definition, the part of the header starting with a single colon is called the ________.

BankAccount::BankAccount( ): balance(0), interest(0.0)

Answer 29

initialization section

Question 30

The name of a constructor is

Answer 30

the name of the class

Question 31

The double colon (::) is known as the ________ operator

Answer 31

scope resolution operator

Question 32

A struct variable is declared differently from a predefined type such as an int

Answer 32

FALSE

Question 33

Two different structure definitions may have the same member names

Answer 33

TRUE

Question 34

The assignment operator may not be used with objects of a class

Answer 34

False

Question 35

All constructors for a class must be private

Answer 35

FALSE

Question 36

A structure can only be passed to a function as a call-by-value parameter

Answer 36

FALSE

Question 37

A function may return a structure

Answer 37

True

Question 38

A class member function may be private

Answer 38

TRUE