Deck 9: Understanding Friends and Overloading Operators

Question 1

In addition to overloading, compilers often need to perform coercion or casting when the + symbol is used with mixed arithmetic.

Answer 1

True

Question 2

Which of the following operators has the highest precedence?

A) new
B) %
C) ::
D) ||

Answer 2

C

Question 3

C++ ____ you to use the built-in precedence rules for your class operators.

A) encourages
B) forces
C) forbids
D) enables

Answer 3

B

Question 4

To use the applyTransaction() function as a friend to both the Customer and the Transaction class, you must use the following syntax: ____.

A) void applyTransaction(Customer, Transaction):friend;
B) friend void applyTransaction(Customer, Transaction);
C) friend void applyTransaction():Customer, Transaction;
D) friend void applyTransaction();

Question 5

When you overload the operator[]() function for a class, the parameter is required to be an integer.

Question 6

The operator++() function overloads the ____ operator.

A) increment
B) pointer-to-member
C) address
D) addition

Question 7

The ____ operator has left-to-right associativity.

A) !
B) &
C) ~
D) ->

Question 8

The operator>>() function overloads the ____ operator.

A) less than
B) pointer-to-member
C) insertion
D) extraction

Question 9

The C++ friend relationship is always one-sided.

Question 10

Which of the following operators has a different precedence than the others?

A) ++
B) []
C) ::
D) .

Question 11

To ____ operations is to allow several operators to be used within the same expression.

A) chain
B) link
C) overload
D) stack

Question 12

The ____ operator is a binary operator.

A) ~
B) %
C) ->*
D) !

Question 13

Which of the following operators has the lowest precedence?

A) new
B) &&
C) ::
D) .

Question 14

The name of the function that overloads the + symbol is the ____ function.

A) op+()
B) +()
C) +operator()
D) operator+()

Question 15

The ____ operator is a unary operator.

A) >>
B) %
C) &
D) /

Question 16

____ is an example of overloading the prefix increment operator.

A) Inventory& operator++(int);
B) Inventory& operator++();
C) Inventory& ++operator(int);
D) Inventory& ++operator();

Question 17

The ____ operator has right-to-left associativity.

A) !
B) %
C) ->*
D) ->

Question 18

You are required to use the word friend within the function name of a friend function.

Question 19

The = operator() function overloads the assignment operator.

Question 20

The operator function overloads the ____ operator.

A) greater than
B) pointer-to-member
C) insertion
D) extraction

Question 21

____ is an example of overloading the postfix increment operator.

A) Inventory& operator++(int);
B) Inventory& operator++();
C) Inventory& ++operator(int);
D) Inventory& ++operator();

Question 22

Distinguish between the terms overloading and polymorphism.

Question 23

Consider the following class declaration:
#include
using namespace std;
class Employee
{
private:
int idNum;
double salary;
public:
Employee(int, double);
double operator+(Employee);
};
Write an implementation for the operator+() function.

Question 24

To use arithmetic symbols with your own objects, you must ____________________ the symbols.

Question 25

The subscript operator, ____, is declared like any other function.

A) operator
B) operator{}
C) operator[]
D) operator()

Question 26

In C++, you use the ____ operator to dynamically allocate memory.

A) new
B) ++
C) +=
D) create

Question 27

Can operators be overloaded for the C++ built-in types? Explain.

Question 28

C++ ____________________ are the symbols you use to perform operations on objects.

Question 29

A(n) ____________________ class is a class in which all functions can access the non-public members of another class.

Question 30

The ____ operator frees previously allocated memory.

A) deallocate
B) delete
C) --
D) -=

Question 31

Which are the five operators that cannot be overloaded in C++?

Question 32

When would you want to use friend functions?

Question 33

To ____ memory for a field is to allot storage for and assign a name to it.

A) assign
B) allocate
C) append
D) increment

Question 34

When you allocate memory during the execution of a program (as opposed to when the program is compiled) you ____________________ allocate memory.

Question 35

When do you use encapsulation and data hiding?

Question 36

The * operator might mean multiplication or be used to ____________________ a pointer.

Question 37

You can use the ____ as an alternate way to make assignments to an object.

A) operator
B) operator{}
C) operator
D) operator()

Question 38

The ____________________ function overloads the decrement operator.

Question 39

Can overloaded functions be friends? If so, how?

Question 40

A(n) ____________________ function can access the non-public members of a class, even though the function itself is not a member of the class.

Question 43

Provide an example of chained operations and explain how you can overload operators to allow this type of operation.

Question 46

When you use the new operator, is the memory allocation always successful? Explain.

Question 47

Write a destructor for the following class:
class Classroom
{
private:
string *student;
int numStudents;
int gradeLevel;
public:
Classroom();
~Classroom();
void display();
};
Classroom::Classroom()
{
int x;
cout > gradeLevel;
cout > numStudents;
student = new string[numStudents];
for(x = 0; x > student[x];
}
}