Deck 7: Introduction to Classes and Objects

Question 1

Object-oriented programming is centered around objects that include both data and the functions that operate on them.

Answer 1

True

Question 2

When the body of a member function is defined inside a class declaration, it is called a(n) ________ function.

A) static
B) global
C) inline
D) conditional
E) constructor

Answer 2

C

Question 3

A destructor is a member function that

A) is used to remove old unneeded objects.
B) causes the program to end.
C) is automatically called when an object is destroyed.
D) can only be called by the main function of a program.
E) None of the above.

Answer 3

C

Question 4

If Circle is the name of a class, which of the following statements would create a Circle object named myCircle?

A) myCircle Circle;
B) myCircle Circle();
C) Circle myCircle;
D) Circle myCircle();
E) None of the above

Question 5

In OOP terminology, an object's member variables are often called its ________, and its member functions are sometimes referred to as its ________.

A) values, operators
B) data, activities
C) attributes, activities
D) attributes, methods
E) values, activities

Question 6

A(n) ________ member function may be called by a statement in a function that is outside of the class.

A) inline
B) public
C) private
D) declared
E) constructor

Question 7

If setRadius is a Circle class function and myCircle is a Circle object, which of the following statements would set myCircle's radius to 2.5?

A) setRadius(2.5);
B) myCircle.setRadius(2.5);
C) Circle.setRadius(2.5);
D) Circle(setRadius(2.5));
E) None of the above

Question 8

A C++ member function that uses, but does not change, the value of a member variable is called

A) an accessor.
B) a mutator.
C) a user.
D) a constant.
E) a constructor.

Question 9

A structure has member variables, like an object, but they are usually all public and accessed directly with the dot operator, instead of by calling member functions.

Question 10

A constructor that does not require that any arguments be passed to it is called a(n) ________ constructor.

A) empty
B) default
C) stand-alone
D) zero-element
E) useless

Question 11

A constructor may have a return type of

A) int
B) bool
C) void
D) any of the above.
E) none of the above.

Question 12

Which of the following statements about ADTs are True.

A) They specify the values the data type can hold.
B) They specify the operations the data type can perform.
C) They hide the details of how the data type is implemented.
D) They do all of the above.
E) They do A and B, but not C.

Question 13

A class declaration provides a pattern for creating objects, but doesn't make any objects.

Question 14

Which of the following statements correctly creates an enumerated data type and defines an object of that type.

A) enum Season = {"Spring", "Summer", "Fall", "Winter"} favoriteSeason;
B) enum Season = {Spring, Summer, Fall, Winter}, Season favoriteSeason;
C) enum Season {Spring, Summer, Fall, Winter}, enum favoriteSeason;
D) ENUM Season {Spring, Summer, Fall, Winter} favoriteSeason;
E) None of these

Question 15

ADT stands for Algorithmic Data Type.

Question 16

When three different objects of a class are created, they are said to be separate ________ of the class.

A) members
B) ADTs
C) instances
D) children
E) None of the above

Question 17

An object typically hides its data, but allows outside code to access it through its

A) private member functions.
B) public member functions.
C) public data members.
D) access specifiers.
E) None of the above

Question 18

A constructor is a public class function that is automatically invoked (i.e., called) whenever a class object is created.

Question 19

Accessors are sometimes called ________ functions and mutators are sometimes called ________ functions.

A) set, get
B) get, set
C) public, private
D) private, public
E) regular, inline

Question 20

A class must have exactly one constructor.

Question 21

A structure variable is similar to a class object in which of the following ways?

A) It has member data that is usually private and accessed through public member functions.
B) Its data can be initialized with a constructor.
C) It can be passed to a function or returned from a function.
D) All of the above.
E) B and C, but not A.

Question 22

The bundling of an object's data and functions together is called

A) OOP.
B) encapsulation.
C) data hiding.
D) structuring.
E) private access.

Question 23

A constructor must have the same name as the

A) first private data member.
B) first public data member.
C) class.
D) first object of the class.
E) function return type.

Question 24

In C++ and other object-oriented programming languages, ADTs are normally implemented as classes.

Question 25

A class declaration creates an object.

Question 26

When an object or structure variable is passed to a function as a constant reference

A) the function accesses the original object, rather than a copy of it.
B) the function cannot make any changes to the member variables.
C) it is more efficient than passing it by value.
D) all of the above are True.
E) A and B are True, but not C.

Question 27

When a member function is defined outside of the class declaration, the function name must be qualified with the class name, followed by

A) a semicolon(;).
B) the scope resolution operator (::).
C) the public access specifier.
D) the private access specifier.
E) a tilde (~).

Question 28

A C++ member function that sets or changes the value stored in a member variable is called

A) an accessor.
B) a mutator.
C) a user.
D) a get function.
E) an updater.

Question 29

A class may have ________ default constructor(s) and ________ destructor(s).

A) only one, only one
B) only one, more than one
C) more than one, only one
D) more than one, more than one
E) no, only one

Question 30

If setSide is a Square class function and box is a Square object, which of the following statements would set the length of box's side to 5?

A) setSide(5);
B) box.setSide(5);
C) Square.setSide(5);
D) Square.setSide = 5;
E) None of the above

Question 31

A class can have a member variable that is an instance of another class. This is called object nesting.

Question 32

A private member function may only be called from a function that is a member of the same class.

Question 33

An Abstract data type (AD
T) is a programmer-defined data type that specifies the values the type can hold, the operations that can be performed on them, and how the operations will be implemented.

Question 34

An object is a(n) ________ of a class.

A) example
B) copy
C) instance
D) attribute
E) member

Question 35

The name of a destructor must begin with

A) the name of the class.
B) a tilde (~).
C) a capital letter.
D) an underscore.
E) none of the above.

Question 36

What will the following code segment display?
Enum Season {Spring, Summer, Fall, Winter} favoriteSeason;
FavoriteSeason = Summer;
Cout << favoriteSeason;

A) 1
B) 2
C) Summer
D) "Summer"
E) None of these.

Question 37

The ________ is used to protect important data.

A) default constructor
B) class protection operator
C) protect() member function
D) public access specifier
E) private access specifier

Question 38

A constructor is a public class function that gets called whenever you want to re-initialize an object's member data.

Question 39

If Square is the name of a class, which of the following statements would create a Square object named box?

A) box Square();
B) box Square;
C) Square box();
D) Square box;
E) None of the above

Question 40

Public members of a class object can be accessed from outside the class by using the

A) dot operator.
B) get function.
C) extraction operator.
D) member access operator.
E) class name.