Question 1

To use an operator on user-defined class objects, operator overloading:

Accepted Answer

A)  Must always be used. 
B)  Must always be used, with three exceptions. 
C)  Must never be used, with three exceptions. 
D)  Must never be used. 
A)  Must always be used. 
B)  Must always be used, with three exceptions. 
C)  Must never be used, with three exceptions. 
D)  Must never be used.

Question 2

To implicitly overload the += operator:

Accepted Answer

A)  Only the + operator needs to be overloaded. 
B)  Only the = operator needs to be overloaded. 
C)  Both the + and = operators need to be overloaded. 
D)  The += operator cannot be overloaded implicitly. 
A)  Only the + operator needs to be overloaded. 
B)  Only the = operator needs to be overloaded. 
C)  Both the + and = operators need to be overloaded. 
D)  The += operator cannot be overloaded implicitly.

Question 3

Y and z are user-defined objects and the += operator is an overloaded member function. The operator is overloaded such that y += z adds z and y, then stores the result in y. Which of the following expressions is always equivalent to y += z?

Accepted Answer

A)  y = y operator+= z 
B)  y.operator+= z ) 
C)  y = y + z 
D)  y operator+= y + z ) 
A)  y = y operator+= z 
B)  y.operator+= z ) 
C)  y = y + z 
D)  y operator+= y + z )

Question 4

Which statement about operator overloading is false?

Accepted Answer

A)  New operators can never be created. 
B)  Certain overloaded operators can change the number of arguments they take. 
C)  The precedence of an operator cannot be changed by overloading. 
D)  Overloading cannot change how an operator works on built-in types. 
A)  New operators can never be created. 
B)  Certain overloaded operators can change the number of arguments they take. 
C)  The precedence of an operator cannot be changed by overloading. 
D)  Overloading cannot change how an operator works on built-in types.

Question 5

Which of the following is false?

Accepted Answer

A)  A string can be defined to store any data type. 
B)  Class string provides bounds checking in its member function at. 
C)  Class string's overloaded [] operator returns a vector element as an rvalue or an lvalue, depending on the context. 
D)  An exception is thrown if the argument to string's at member function is an invalid subscript. 
A)  A string can be defined to store any data type. 
B)  Class string provides bounds checking in its member function at. 
C)  Class string's overloaded [] operator returns a vector element as an rvalue or an lvalue, depending on the context. 
D)  An exception is thrown if the argument to string's at member function is an invalid subscript.

Question 6

Because the postfix increment operator returns objects by value and the prefix increment operator returns objects by reference:

Accepted Answer

A)  Prefix increment has slightly more overhead than postfix increment. 
B)  The postfix increment operator returns the actual incremented object with its new value. 
C)  Objects returned by postfix increment cannot be used in larger expressions. 
D)  The postfix increment operator typically returns a temporary object that contains the original value of the object before the increment occurred. 
A)  Prefix increment has slightly more overhead than postfix increment. 
B)  The postfix increment operator returns the actual incremented object with its new value. 
C)  Objects returned by postfix increment cannot be used in larger expressions. 
D)  The postfix increment operator typically returns a temporary object that contains the original value of the object before the increment occurred.

Question 7

The delete operator:

Accepted Answer

A)  Can terminate the program. 
B)  Must be told which destructor to call when destroying an object. 
C)  Can delete an entire array of objects declared using new. 
D)  Is called implicitly at the end of a program. 
A)  Can terminate the program. 
B)  Must be told which destructor to call when destroying an object. 
C)  Can delete an entire array of objects declared using new. 
D)  Is called implicitly at the end of a program.

Question 8

Proxy classes are best described as an example of:

Accepted Answer

A)  Object-oriented programming as used in the text). 
B)  Structured programming. 
C)  Information hiding. 
D)  Utility functions. 
A)  Object-oriented programming as used in the text). 
B)  Structured programming. 
C)  Information hiding. 
D)  Utility functions.

Question 9

In addition to hiding the implementation details that the ordinary method of "separating implementation from interface" would hide, using a proxy class also hides:

Accepted Answer

A)  The definition of inline functions. 
B)  The definition of access functions. 
C)  The definition of constructors and the destructor. 
D)  The names of private data members. 
A)  The definition of inline functions. 
B)  The definition of access functions. 
C)  The definition of constructors and the destructor. 
D)  The names of private data members.

Question 10

The array subscript operator [], when overloaded, cannot:

Accepted Answer

A)  Be used with linked list classes. 
B)  Take a float as an operand. 
C)  Take multiple values inside 
D)  Take user-defined objects as operands. 
E) g., [4,8]). 
A)  Be used with linked list classes. 
B)  Take a float as an operand. 
C)  Take multiple values inside 
D)  Take user-defined objects as operands. 
E) g., [4,8]).

Question 11

Which situation would require the operator to be overloaded as a global function?

Accepted Answer

A)  The overloaded operator is =. 
B)  The left most operand must be a class object or a reference to a class object). 
C)  The left operand is an int. 
D)  The operator returns a reference. 
A)  The overloaded operator is =. 
B)  The left most operand must be a class object or a reference to a class object). 
C)  The left operand is an int. 
D)  The operator returns a reference.

Question 12

To prevent class objects from being copied:

Accepted Answer

A)  Make the overloaded assignment operator private. 
B)  Make the copy constructor private. 
C)  Both a) and b). 
D)  None of the above. 
A)  Make the overloaded assignment operator private. 
B)  Make the copy constructor private. 
C)  Both a) and b). 
D)  None of the above.

To use an operator on user-defined class objects, operator overloading:

To implicitly overload the += operator:

Y and z are user-defined objects and the += operator is an overloaded member function. The operator is overloaded such that y += z adds z and y, then stores the result in y. Which of the following expressions is always equivalent to y += z?

Which statement about operator overloading is false?

Which of the following is false?

Because the postfix increment operator returns objects by value and the prefix increment operator returns objects by reference:

The delete operator:

Proxy classes are best described as an example of:

In addition to hiding the implementation details that the ordinary method of "separating implementation from interface" would hide, using a proxy class also hides:

The array subscript operator [], when overloaded, cannot:

Which situation would require the operator to be overloaded as a global function?

To prevent class objects from being copied:

Introduction to Computers, the Internet and the World Wide Web

Introduction to C Programming

Control Statements, Part 1

Control Statements, Part 2

Functions and an Introduction to Recursion

Arrays and Vectors

Pointers and Pointer-Based Strings

Sequential-Access Files

Classes

Classes: a Deeper Look, Part 2

Object-Oriented Programming: Inheritance

Object-Oriented Programming: Polymorphism

Templates

Stream Inputoutput

Exception Handling

File Processing

Class String and String Stream Processing

Searching and Sorting

Data Structures

Standard Template Library Stl

Bits, Characters, C Strings and Structs

Boost Libraries, Technical Report 1 and C0x

Other Topics

ATM Case Study, Part 1: Object-Oriented Design With the Uml

ATM Case Study, Part 2: Implementing an Object-Oriented Design

Game Programming With Ogre

Filters

Exam 11: Operator Overloading; String and Array Objects

To use an operator on user-defined class objects, operator overloading:

To implicitly overload the += operator:

Y and z are user-defined objects and the += operator is an overloaded member function. The operator is overloaded such that y += z adds z and y, then stores the result in y. Which of the following expressions is always equivalent to y += z?

Which statement about operator overloading is false?

Which of the following is false?

Because the postfix increment operator returns objects by value and the prefix increment operator returns objects by reference:

The delete operator:

Proxy classes are best described as an example of:

In addition to hiding the implementation details that the ordinary method of "separating implementation from interface" would hide, using a proxy class also hides:

The array subscript operator [], when overloaded, cannot:

Which situation would require the operator to be overloaded as a global function?

To prevent class objects from being copied:

Introduction to Computers, the Internet and the World Wide Web

Introduction to C Programming

Control Statements, Part 1

Control Statements, Part 2

Functions and an Introduction to Recursion

Arrays and Vectors

Pointers and Pointer-Based Strings

Sequential-Access Files

Classes

Classes: a Deeper Look, Part 2

Object-Oriented Programming: Inheritance

Object-Oriented Programming: Polymorphism

Templates

Stream Inputoutput

Exception Handling

File Processing

Class String and String Stream Processing

Searching and Sorting

Data Structures

Standard Template Library Stl

Bits, Characters, C Strings and Structs

Boost Libraries, Technical Report 1 and C0x

Other Topics

ATM Case Study, Part 1: Object-Oriented Design With the Uml

ATM Case Study, Part 2: Implementing an Object-Oriented Design

Game Programming With Ogre

Filters