Deck 7: Introduction to Classes and Objects

Question 1

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

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

Answer 1

A

Question 2

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

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

Answer 2

D

Question 3

Objects permit data hiding. This means they can keep functions outside the class from

A)deleting the data.
B)knowing the names of the variables holding the data.
C)directly accessing the data.
D)changing the data.
E)doing all of the above.

Answer 3

E

Question 4

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

A)object composition.
B)encapsulation.
C)object containment.
D)data hiding.
E)none of the above.

Question 5

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

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

Question 6

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

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

Question 7

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)attributes, methods
C)data, activities
D)values, activities
E)attributes, activities

Question 8

The is used to protect important data.

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

Question 9

A constructor may have a return type of

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

Question 10

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

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

Question 11

ADT stands for _ Data Type.

A)Abstract
B)Automatic
C)Action
D)Algorithmic
E)None of the above

Question 12

The name of a destructor must begin with

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

Question 13

A destructor is a member function that

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

Question 14

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 15

When a constructor does not require that any arguments be passed to it, it is called a(n)_ constructor.

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

Question 16

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

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

Question 17

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)It can be passed to a function or returned from a function.
C)Its data can be initialized with a constructor.
D)All of the above.
E)B and C, but not A.

Question 18

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 19

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

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

Question 20

A constructor must have the same name as the

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

Question 21

If employee is an instance of a class with 3 member variables (name, salary, and
^department), the values of all three members will be output by the statement
cout << employee;

Question 22

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

Question 23

member function may be called by a statement in a function that is outside the class.

A)A public
B)A declared
C)Any
D)An inline
E)A private

Question 24

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

Question 25

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

Question 26

An Abstract data type (ADT)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 27

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

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

Question 28

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

Question 29

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

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

Question 30

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

Question 31

A class declaration provides a pattern for creating objects, so when a class is declared it automatically creates an object.

Question 32

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

A)private
B)public
C)overloaded
D)local
E)constructor

Question 33

Objects can be passed to, and returned from, functions.

Question 34

In an ADT the implementation details are the interface through which a program uses it.

A)determined by
B)kept separate from
C)a part of
D)used by
E)None of the above

Question 35

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 36

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

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

Question 37

A class can only have one constructor.

Question 38

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

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

Question 39

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

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

Question 40

A class declaration describes an object, but does not create any objects.