Deck 10: Classes and Data Abstraction

Question 1

A ____ sign in front of a member name on a UML diagram indicates that this member is a public member.

A) +
B) -
C) #
D) $

Answer 1

A

Question 2

In C++, class is a reserved word and it defines only a data type.

Answer 2

True

Question 3

Consider the UML class diagram shown in the accompanying figure. According to the UML class diagram, how many private members are in the class?

A) none
B) zero
C) two
D) three

Answer 3

D

Question 4

Consider the UML class diagram shown in the accompanying figure. Which of the following is the name of the class?

A) clock
B) clockType
C) Type
D) +clockType

Question 5

Given this declaration:
class myClass
{
public:
void print(); //Output the value of x;
MyClass();
private:
int x;
};
myClass myObject;
The following statement is legal.
myObject.x = 10;

Question 6

The word ____ at the end of several the member functions in the accompanying figure class clockType specifies that these functions cannot modify the member variables of a clockType object.

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

Question 7

If an object is declared in the definition of a member function of the class, then the object can access both the public and private members of the class.

Question 8

The public members of a class must be declared before the private members.

Question 9

If the heading of a member function of a class ends with the word const, then the function member cannot modify the private member variables, but it can modify the public member variables.

Question 10

Which of the following class definitions is correct in C++?

A)

B)

C)

D)

Question 11

If a member of a class is ____, you cannot access it outside the class.

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

Question 12

If an object is created in a user program, then the object can access both the public and private members of the class.

Question 13

The components of a class are called the ____ of the class.

A) elements
B) members
C) objects
D) properties

Question 14

In C++ terminology, a class object is the same as a class instance.

Question 15

Consider the accompanying class definition. Which of the following variable declarations is correct?

A) rectangle rectangleType;
B) class rectangleType rectangle;
C) rectangleType rectangle;
D) rectangle rectangleType.area;

Question 16

A class and its members can be described graphically using a notation known as the ____ notation.

A) OON
B) OOD
C) UML
D) OOP

Question 17

You can use arithmetic operators to perform arithmetic operations on class objects.

Question 18

As parameters to a function, class objects can be passed by reference only.

Question 19

A ____ sign in front of a member name on a UML diagram indicates that this member is a protected member.

A) +
B) -
C) #
D) $

Question 20

A class is an example of a structured data type.

Question 21

With ____________________ functions, the definitions of the member functions are placed in the implementations file.

Question 22

What does ADT stand for?

A) abstract definition type
B) asynchronous data transfer
C) abstract data type
D) alternative definition type

Question 23

A member function of a class that only accesses the value(s) of the data member(s) is called a(n) ____ function.

A) accessor
B) mutator
C) constructor
D) destructor

Question 24

In C++, the scope resolution operator is ____.

A) :
B) ::
C) $
D) .

Question 25

Non-static member variables of a class are called the ____________________ variables of the class.

Question 26

If a class object is passed by ____________________, the contents of the member variables of the actual parameter are copied into the corresponding member variables of the formal parameter.

Question 27

To guarantee that the member variables of a class are initialized, you use ____.

A) accessors
B) mutators
C) constructors
D) destructor

Question 28

If a function of a class is static, it is declared in the class definition using the keyword static in its ____.

A) return type
B) parameters
C) heading
D) main function

Question 29

How many destructors can a class have?

A) no explicit destructors
B) one
C) two
D) any number

Question 30

In C++, the ____ is called the member access operator.

A) .
B) ,
C) ::
D) #

Question 31

Which of the following is true about classes and structs?

A) By default, all members of a struct are public and all members of a class are private.
B) A struct variable is passed by value only, and a class variable is passed by reference only.
C) An assignment operator is allowed on class variables, but not on struct variables.
D) You cannot use the member access specifier private in a struct.

Question 32

A class object can be ____. That is, it can be created once, when the control reaches its declaration, and destroyed when the program terminates.

A) static
B) automatic
C) local
D) public

Question 33

Consider the accompanying class definition, and the declaration: rectangleType bigRect;
Which of the following statements is correct?

A) rectangleType.print();
B) rectangl

Question 34

Consider the accompanying class and member functions definitions. How many constructors are present in the class definition?

A) none
B) one
C) two
D) three

Question 35

A program or software that uses and manipulates the objects of a class is called a(n) ____________________ of that class.

Question 36

In C++, you can pass a variable by reference and still prevent the function from changing its value by using the keyword ____ in the formal parameter declaration.

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

Question 37

A destructor has the character ____, followed by the name of the class.

A) .
B) ::
C) #
D) ˜

Question 38

Consider the accompanying class definition, and the object declaration: rectangleType bigRect(14,10);
Which of the following statements is correct?

A) bigRect.setLengthWidth();
B) bigRect.setLengthWidth(3.0, 2.0);
C) bigRect.length = 2.0;
D) bigRect.length = bigRect.width;

Question 39

A class object can be ____. That is, it is created each time the control reaches its declaration, and destroyed when the control exits the surrounding block.

A) static
B) automatic
C) local
D) public

Question 40

A(n) ____________________ function of a class changes the values of the member variable(s) of the class.

Question 41

A(n) ____________________ contains the definitions of the functions to implement the operations of an object.

Question 42

The header file is also known as the ____________________.

Question 43

A(n) ____________________ is a statement specifying the condition(s) that must be true before the function is called.