Deck 7: Using Classes

Question 1

When a class field is ____, only one memory location is allocated, no matter how many objects of the class you instantiate.

A) const
B) static
C) void
D) private

Answer 1

B

Question 2

Programmers sometimes refer to ____ as an example of using a "black box."

A) polymorphism
B) encapsulation
C) instantiation
D) abstraction

Answer 2

B

Question 3

You ____ assign a value to a field in a class definition.

A) can
B) cannot
C) should
D) should not

Answer 3

B

Question 4

To ____ an object is to declare or create it.

A) instantiate
B) encapsulate
C) abstract
D) overload

Question 5

The access modifier ____ means a class member cannot be accessed using any statements in any functions that are not also part of the class.

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

Question 6

You must use both the class name and the ____ operator when you implement a member function, because they tie the function to the class and allow every instantiated object to use the function name.

A) address
B) dot
C) scope resolution
D) pointer-to-member

Question 7

The scope resolution operator is ____.

A) &
B) ::
C) *
D) ->

Question 8

To use the function displayStudentData() of the object aSophmore that belongs to the class Student , the correct syntax is ____.

A) aSophmore.displayStudentData();
B) Student.displayStudentData();
C) aSophmore::displayStudentData();
D) *aSophmore.displayStudentData();

Question 9

C++ is an extensible language.

Question 10

The ____ section of a class contains the class name, variables (attributes), and function prototypes.

A) header
B) definition
C) declaration
D) implementation

Question 11

A C++ ____ is an instantiation of a class that can contain both data members and methods.

A) variable
B) field
C) structure
D) object

Question 12

A(n) ____ language is one to which you can add your own data types.

A) low-level
B) high-level
C) extensible
D) object-oriented

Question 13

You may use the this pointer instead of the class name and scope resolution operator when a local variable and a field name conflict.

Question 14

All members of a class share a single storage location for a static data member of that same class.

Question 15

When you create a class, you usually make data items public.

Question 16

The value of a static field cannot be changed.

Question 17

When you create a class, you usually make the functions private.

Question 18

To ____ components is to contain them.

A) instantiate
B) abstract
C) declare
D) encapsulate

Question 19

An abstract data type is a type defined by C++.

Question 20

A class is a new data type you create that is more complex than the basic data types.

Question 21

Consider the following class:
class Student
{
private:
int idNum;
string lastName;
double gradePointAverage;
};
Add a public function void displayStudentData() to the class definition and then write an implementation for the function.

Question 22

Why should you make class data fields private and not public?

Question 23

A function that is a user of your class is a class ____________________.

Question 24

The ______________________________ is constructed by using a dash followed by a right-angle bracket (or greater-than sign).

Question 25

When may it be a good idea to make data public in a class?

Question 26

____ variables are sometimes called class variables, class fields, or class-wide fields.

A) Public
B) Private
C) Constant
D) Static

Question 27

The only type of class member function that does not have a this pointer is a ____ member function.

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

Question 28

Static functions ____ access non-static variables.

A) can
B) cannot
C) should
D) should not

Question 29

Write a class with three private fields and then modify it so that the fields are public. Show both versions.

Question 30

The variable ____ is an example of a correct use of the this pointer.

A) *this.employeeIdNum
B) (*this).employeeIdNum
C) *(this.employeeIdNum)
D) *(this).employeeIdNum

Question 31

Conventionally, object names begin with a(n) ____________________ letter.

Question 32

When you use an object, the ____ operator, and a non-static function of the object's class, you actually pass the specific object's address to the function as an unseen argument.

A) scope resolution
B) conditional
C) dot
D) address

Question 33

When you do not want to declare an object, you can still access a static , class-wide field by using a function that is ____.

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

Question 34

The ____ pointer is automatically supplied every time you call a non-static member function of a class.

A) this
B) super
C) const
D) void

Question 35

Conventionally, class names begin with a(n) ____________________ letter.

Question 36

ADT stands for ____________________.

Question 37

____________________ variables belong to the class, and you can use them even if you never instantiate an object.

Question 38

When you create an object, a block of ____________________ is set aside for the data members.

Question 39

The ____ operator is the pointer-to-member operator.

A) ::
B) &
C) *
D) ->

Question 40

A ____ class member exists, even when you have not instantiated any objects of the class.

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

Question 41

Can you modify the this pointer? Why or why not?

Question 42

What is the difference in memory allocation between a static and a non-static variable?

Question 43

Write a class declaration that has three private fields and three functions that can be used to assign values to each of the data fields of the class. Write the implementation of one of the functions.

Question 44

In what situation would you want to use the this pointer?

Question 50

Should static fields always be constant? Explain your answer.

Question 53

Consider the function shown below:
void Customer::setBalance(double balance)
{
Customer::balance = balance;
}
Why is the scope resolution operator needed within the function body?

Question 55

Should you use a static class member with an object name or with the class name?