Question 1

Polymorphism is implemented via:

Accepted Answer

A)  Member functions. 
B)  virtual functions and dynamic binding. 
C)  inline functions. 
D)  Non-virtual functions. 
A)  Member functions. 
B)  virtual functions and dynamic binding. 
C)  inline functions. 
D)  Non-virtual functions.

Question 2

Which of the following assignments would be a compilation error?

Accepted Answer

A)  Assigning the address of a base-class object to a base-class pointer. 
B)  Assigning the address of a base-class object to a derived-class pointer. 
C)  Assigning the address of a derived-class object to a base-class pointer. 
D)  Assigning the address of a derived-class object to a derived-class pointer. 
A)  Assigning the address of a base-class object to a base-class pointer. 
B)  Assigning the address of a base-class object to a derived-class pointer. 
C)  Assigning the address of a derived-class object to a base-class pointer. 
D)  Assigning the address of a derived-class object to a derived-class pointer.

Question 3

The line: virtual double earnings() const = 0;
Appears in a class definition. You cannot deduce that:

Accepted Answer

A)  All classes that directly inherit from this class will override this method. 
B)  This class is an abstract class. 
C)  Any concrete class derived from this class will have an earnings function. 
D)  This class will probably be used as a base class for other classes. 
A)  All classes that directly inherit from this class will override this method. 
B)  This class is an abstract class. 
C)  Any concrete class derived from this class will have an earnings function. 
D)  This class will probably be used as a base class for other classes.

Question 4

What mistake prevents the following class declaration from functioning properly as an abstract class? class Shape
{
Public:
Virtual double print() const;
Double area() const {return base * height;}
Private:
Double base;
Double height;
};

Accepted Answer

A)  There are no pure virtual functions. 
B)  There is a non-virtual function. 
C)  private variables are being accessed by a public function. 
D)  Nothing, it functions fine as an abstract class. 
A)  There are no pure virtual functions. 
B)  There is a non-virtual function. 
C)  private variables are being accessed by a public function. 
D)  Nothing, it functions fine as an abstract class.

Question 5

The C++ compiler makes objects take up more space in memory if they:

Accepted Answer

A)  Are derived from base classes. 
B)  Have virtual functions. 
C)  Have only protected members. 
D)  Are referenced by pointers. 
A)  Are derived from base classes. 
B)  Have virtual functions. 
C)  Have only protected members. 
D)  Are referenced by pointers.

Question 6

To help prevent errors, apply C++11's ________ keyword to the prototype of every derived-class function that overrides a base-class virtual function.

Accepted Answer

A)  virtual 
B)  abstract 
C)  overridable 
D)  None of the above. 
A)  virtual 
B)  abstract 
C)  overridable 
D)  None of the above.

Question 7

Concrete classes that inherit virtual functions but do not override their implementations:

Accepted Answer

A)  Have vtables which are the same as those of their base classes. 
B)  Receive their own copies of the virtual functions. 
C)  Receive pointers to their base classes' virtual functions. 
D)  Receive pointers to pure virtual functions. 
A)  Have vtables which are the same as those of their base classes. 
B)  Receive their own copies of the virtual functions. 
C)  Receive pointers to their base classes' virtual functions. 
D)  Receive pointers to pure virtual functions.

Polymorphism is implemented via:

Which of the following assignments would be a compilation error?

The line: virtual double earnings() const = 0; Appears in a class definition. You cannot deduce that:

What mistake prevents the following class declaration from functioning properly as an abstract class? class Shape { Public: Virtual double print() const; Double area() const {return base * height;} Private: Double base; Double height; };

The C++ compiler makes objects take up more space in memory if they:

To help prevent errors, apply C++11's ________ keyword to the prototype of every derived-class function that overrides a base-class virtual function.

Concrete classes that inherit virtual functions but do not override their implementations:

Introduction to Computers and C++

Introduction to C Programming; Inputoutput and Operators

Introduction to Classes, Objects and Strings

Control Statements, Assignment, and Operators

Control Statements, Logical Operators

Functions and an Introduction to Recursion

Class Templates Array and Vector; Catching Exceptions

Pointers and Pointer-Based Strings

Classes: a Deeper Look; Throwing Exceptions

Operator Overloading; String and Array Objects

Object-Oriented Programming: Inheritance

Stream Inputoutput: a Deeper Look

File Processing

Standard Library Containers and Iterators

Standard Library Algorithms

Exception Handling: a Deeper Look

Introduction to Custom Templates

Custom Templatized Data Structures

Searching and Sorting

Class String and String Stream Processing

Bits, Characters, C Strings and Structs

Other Topics

C++11 Additional Features

Filters

Exam 12: Object-Oriented Programming: Polymorphism

Polymorphism is implemented via:

Which of the following assignments would be a compilation error?

The line: virtual double earnings() const = 0; Appears in a class definition. You cannot deduce that:

What mistake prevents the following class declaration from functioning properly as an abstract class? class Shape { Public: Virtual double print() const; Double area() const {return base * height;} Private: Double base; Double height; };

The C++ compiler makes objects take up more space in memory if they:

To help prevent errors, apply C++11's ________ keyword to the prototype of every derived-class function that overrides a base-class virtual function.

Concrete classes that inherit virtual functions but do not override their implementations:

Introduction to Computers and C++

Introduction to C Programming; Inputoutput and Operators

Introduction to Classes, Objects and Strings

Control Statements, Assignment, and Operators

Control Statements, Logical Operators

Functions and an Introduction to Recursion

Class Templates Array and Vector; Catching Exceptions

Pointers and Pointer-Based Strings

Classes: a Deeper Look; Throwing Exceptions

Operator Overloading; String and Array Objects

Object-Oriented Programming: Inheritance

Stream Inputoutput: a Deeper Look

File Processing

Standard Library Containers and Iterators

Standard Library Algorithms

Exception Handling: a Deeper Look

Introduction to Custom Templates

Custom Templatized Data Structures

Searching and Sorting

Class String and String Stream Processing

Bits, Characters, C Strings and Structs

Other Topics

C++11 Additional Features

Filters