Question 1

The __________ operator returns a reference to a __________ object:

Accepted Answer

A)  typeid, type_info 
B)  typeinfo, type_id 
C)  typeid, data_type 
D)  typeinfo, type 
A)  typeid, type_info 
B)  typeinfo, type_id 
C)  typeid, data_type 
D)  typeinfo, type A

Question 2

Employee is a base class and HourlyWorker is a derived class, with a redefined non-virtual print function. Given the following statements, will the output of the two print function calls be identical? HourlyWorker h;
Employee *ePtr = &h;
EPtr->print();
EPtr->Employee::print();

Accepted Answer

A)  Yes. 
B)  Yes, if print is a static function. 
C)  No. 
D)  It would depend on the implementation of the print function. 
A)  Yes. 
B)  Yes, if print is a static function. 
C)  No. 
D)  It would depend on the implementation of the print function. A

Question 3

If objects of all the classes derived from the same base class all need to draw themselves, the draw function would most likely be declared:

Accepted Answer

A)  private 
B)  virtual 
C)  protected 
D)  friend 
A)  private 
B)  virtual 
C)  protected 
D)  friend B

Question 4

[C++11] In C++11, you can tell the compiler to explicitly generate the default version of a default constructor, copy constructor, move constructor, copy assignment operator, move assignment operator or destructor by following the special member function's prototype with ________.

Accepted Answer

A)  default 
B)  explicit 
C)  (default) 
D)  = default 
A)  default 
B)  explicit 
C)  (default) 
D)  = default

Question 5

Which of the following statements about polymorphism is false?

Accepted Answer

A)  With polymorphism, you can direct a variety of objects to behave in manners appropriate to those objects without even knowing their types. 
B)  With polymorphism, new types of objects that can respond to existing messages can easily be incorporated into a system without modifying the base system. 
C)  Polymorphism enables you to deal in specifics and let the execution-time environment concern itself with the generalities. 
D)  To get polymorphic behavior among existing objects, those objects must be instantiated from classes in the same inheritance hierarchy. 
A)  With polymorphism, you can direct a variety of objects to behave in manners appropriate to those objects without even knowing their types. 
B)  With polymorphism, new types of objects that can respond to existing messages can easily be incorporated into a system without modifying the base system. 
C)  Polymorphism enables you to deal in specifics and let the execution-time environment concern itself with the generalities. 
D)  To get polymorphic behavior among existing objects, those objects must be instantiated from classes in the same inheritance hierarchy.

Question 6

Which of the following statements about virtual functions is false?

Accepted Answer

A)  They allow the program to select the correct implementation at execution time. 
B)  They can use either static or dynamic binding, depending on the handles on which the functions are called. 
C)  They do not remain virtual down the inheritance hierarchy. 
D)  They can be called using the dot operator. 
A)  They allow the program to select the correct implementation at execution time. 
B)  They can use either static or dynamic binding, depending on the handles on which the functions are called. 
C)  They do not remain virtual down the inheritance hierarchy. 
D)  They can be called using the dot operator.

Question 7

Which of the following is not allowed?

Accepted Answer

A)  Objects of abstract classes. 
B)  Multiple pure virtual functions in a single abstract class. 
C)  References to abstract classes. 
D)  Arrays of pointers to abstract classes. 
A)  Objects of abstract classes. 
B)  Multiple pure virtual functions in a single abstract class. 
C)  References to abstract classes. 
D)  Arrays of pointers to abstract classes.

Question 8

Virtual functions must:

Accepted Answer

A)  Be overridden in every derived class. 
B)  Be declared virtual in every derived class. 
C)  Be declared virtual in the base class. 
D)  Have the same implementation in every derived class. 
A)  Be overridden in every derived class. 
B)  Be declared virtual in every derived class. 
C)  Be declared virtual in the base class. 
D)  Have the same implementation in every derived class.

Question 9

Problems using switch logic to deal with many objects of different types do not include:

Accepted Answer

A)  Forgetting to include an object in one of the cases. 
B)  Having to update the switch statement whenever a new type of object is added. 
C)  Having to track down every switch statement to do an update of object types. 
D)  Not being able to implement separate functions on different objects. 
A)  Forgetting to include an object in one of the cases. 
B)  Having to update the switch statement whenever a new type of object is added. 
C)  Having to track down every switch statement to do an update of object types. 
D)  Not being able to implement separate functions on different objects.

Question 10

An abstract class will:

Accepted Answer

A)  Have all zero function pointers in its vtable. 
B)  Have at least one zero function pointer in its vtable. 
C)  Share a vtable with a derived class. 
D)  Have fewer zero function pointers in its vtable than concrete classes have. 
A)  Have all zero function pointers in its vtable. 
B)  Have at least one zero function pointer in its vtable. 
C)  Share a vtable with a derived class. 
D)  Have fewer zero function pointers in its vtable than concrete classes have.

Question 11

Downcasting enables:

Accepted Answer

A)  A derived-class object to be treated as a base-class object. 
B)  A base-class object to be treated as a derived-class object. 
C)  Making a base-class pointer into a derived-class pointer. 
D)  Making a derived-class pointer into a base -class pointer. 
A)  A derived-class object to be treated as a base-class object. 
B)  A base-class object to be treated as a derived-class object. 
C)  Making a base-class pointer into a derived-class pointer. 
D)  Making a derived-class pointer into a base -class pointer.

Question 12

Which of the following statements is true?

Accepted Answer

A)  In C++11, all classes can be used as base classes. 
B)  In C++11, only classes that are not declared as final can be used as base classes. 
C)  In C++11, only classes that are declared as base can be used as base classes. 
D)  None of the above 
A)  In C++11, all classes can be used as base classes. 
B)  In C++11, only classes that are not declared as final can be used as base classes. 
C)  In C++11, only classes that are declared as base can be used as base classes. 
D)  None of the above

Question 13

The main difference between a pure virtual function and a virtual function is:

Accepted Answer

A)  The return type. 
B)  The member access specifier. 
C)  That a pure virtual function cannot have an implementation. 
D)  The location in the class. 
A)  The return type. 
B)  The member access specifier. 
C)  That a pure virtual function cannot have an implementation. 
D)  The location in the class.

Question 14

Which of the following would not be a member function that derived classes Fish, Frog and Bird should inherit from base class Animal and then provide their own definitions for, so that the function call can be performed polymorphically?

Accepted Answer

A)  eat 
B)  sleep 
C)  move 
D)  flapWings 
A)  eat 
B)  sleep 
C)  move 
D)  flapWings

Question 15

Run-time type information can be used to determine:

Accepted Answer

A)  A function's return type. 
B)  A function's argument type. 
C)  An object's type. 
D)  The number of arguments a function takes. 
A)  A function's return type. 
B)  A function's argument type. 
C)  An object's type. 
D)  The number of arguments a function takes.

Question 16

Virtual destructors must be used when:

Accepted Answer

A)  The constructor in the base class is virtual. 
B)  delete is used on a base-class pointer to a derived-class object. 
C)  delete is used on a derived-class object. 
D)  A constructor in either the base class or derived class is virtual. 
A)  The constructor in the base class is virtual. 
B)  delete is used on a base-class pointer to a derived-class object. 
C)  delete is used on a derived-class object. 
D)  A constructor in either the base class or derived class is virtual.

Question 17

Dynamic_cast is often used to:

Accepted Answer

A)  Perform type checking for objects. 
B)  Convert pointers to strings. 
C)  Upcast pointers. 
D)  Downcast pointers. 
A)  Perform type checking for objects. 
B)  Convert pointers to strings. 
C)  Upcast pointers. 
D)  Downcast pointers.

Question 18

Abstract classes do not necessarily have:

Accepted Answer

A)  A 0 pointer in their vtable. 
B)  A virtual function prototype with the notation = 0. 
C)  Zero instances of their class. 
D)  Zero references to their class. 
A)  A 0 pointer in their vtable. 
B)  A virtual function prototype with the notation = 0. 
C)  Zero instances of their class. 
D)  Zero references to their class.

Question 19

The line: virtual double functionX() const = 0;
In a class definition indicates that the class is probably a:

Accepted Answer

A)  Base class. 
B)  Derived class. 
C)  Protected class. 
D)  Library class. 
A)  Base class. 
B)  Derived class. 
C)  Protected class. 
D)  Library class.

Question 20

Abstract classes:

Accepted Answer

A)  Contain at most one pure virtual function. 
B)  Can have objects instantiated from them if the proper permissions are set. 
C)  Cannot have abstract derived classes. 
D)  Are defined, but the programmer never intends to instantiate any objects from them. 
A)  Contain at most one pure virtual function. 
B)  Can have objects instantiated from them if the proper permissions are set. 
C)  Cannot have abstract derived classes. 
D)  Are defined, but the programmer never intends to instantiate any objects from them.

Exam 12: Object-Oriented Programming: Polymorphism

The __________ operator returns a reference to a __________ object:

Employee is a base class and HourlyWorker is a derived class, with a redefined non-virtual print function. Given the following statements, will the output of the two print function calls be identical? HourlyWorker h; Employee *ePtr = &h; EPtr->print(); EPtr->Employee::print();

If objects of all the classes derived from the same base class all need to draw themselves, the draw function would most likely be declared:

[C++11] In C++11, you can tell the compiler to explicitly generate the default version of a default constructor, copy constructor, move constructor, copy assignment operator, move assignment operator or destructor by following the special member function's prototype with ________.

Which of the following statements about polymorphism is false?

Which of the following statements about virtual functions is false?

Which of the following is not allowed?

Virtual functions must:

Problems using switch logic to deal with many objects of different types do not include:

An abstract class will:

Downcasting enables:

Which of the following statements is true?

The main difference between a pure virtual function and a virtual function is:

Which of the following would not be a member function that derived classes Fish, Frog and Bird should inherit from base class Animal and then provide their own definitions for, so that the function call can be performed polymorphically?

Run-time type information can be used to determine:

Virtual destructors must be used when:

Dynamic_cast is often used to:

Abstract classes do not necessarily have:

The line: virtual double functionX() const = 0; In a class definition indicates that the class is probably a:

Abstract classes:

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

The operator returns a reference to a object: