Deck 12: Pointers, Classes, Virtual Functions, and Abstract Classes

Question 1

The C++ operator ____ is used to destroy dynamic variables.

A) destroy
B) delete
C) *
D) ~

Answer 1

B

Question 2

In the statement
int* p, q;
p and q are pointer variables.

Answer 2

False

Question 3

A memory leak is an unused memory space that cannot be allocated.

Answer 3

True

Question 4

In C++, the member access operator arrow is >>.

Question 5

A pointer variable is a variable whose content is a memory address.

Question 6

What is the value of x after the following statements execute? int x = 25;
Int *p;
P = &x;
*p = 46;

A) NULL
B) 0
C) 25
D) 46

Question 7

The code int *p; declares p to be a(n) ____ variable.

A) new
B) num
C) pointer
D) address

Question 8

The dereferencing operator is also known as the indirection operator and refers to the object to which its operand points.

Question 9

If p is a pointer variable, the statement p = p + 1; is valid in C++.

Question 10

In C++, pointer variables are declared using the reserved word pointer.

Question 11

Which of the following can be used to initialize a pointer variable?

A) 1
B) NULL
C) "0"
D) '0'

Question 12

Given the declaration
int *p;
The statement
p = new int[50];
dynamically allocates an array of 50 components of type int and p contains the base address of the array.

Question 13

The C++ operator ____ is used to create dynamic variables.

A) dynamic
B) new
C) virtual
D) dereferencing

Question 14

Variables that are created during program execution are called static variables.

Question 15

What is the output of the following code? int *p;
Int x;
X = 12;
P = &x;
Cout << x << ", ";
*p = 81;
Cout << *p << endl;

A) 12, 12
B) 12, 81
C) 81, 12
D) 81, 81

Question 16

What is the output of the following code? int *p;
Int x;
X = 76;
P = &x;
*p = 43;
Cout << x << ", " << *p << endl;

A) 76, 76
B) 76, 43
C) 43, 76
D) 43, 43

Question 17

In C++, you declare a pointer variable by using the ____ symbol.

A) *
B) &
C) #
D) @

Question 18

In C++, ____ is called the address of operator.

A) &
B) *
C) #
D) ->

Question 19

In C++, the dot operator has a lower precedence than the dereferencing operator.

Question 20

What is the output of the following statements? int x = 33;
Int *q;
Q = &x;
Cout << *q << endl;

A) NULL
B) 0
C) 3
D) 33

Question 21

In a ____ copy, two or more pointers of the same type point to the same memory.

A) static
B) shallow
C) dynamic
D) deep

Question 22

In C++, virtual functions are declared using the reserved word ____.

A) virtual
B) private
C) public
D) struct

Question 23

The statement int *p; is equivalent to int * p;, which is also equivalent to the statement ____________________.

Question 24

The ____ operator can be used to return the address of a private data member of a class.

A) dereferencing
B) destructor
C) address of
D) member access

Question 25

Consider the following statements:
void pointerParameters(int* &p, double *q)
{
.
.
.
}
In the function pointerParameters, the parameter q is a(n) ____________________ parameter.

Question 26

The statement that declares board to be an array of six pointers wherein each pointer is of type int is: int ____________________;

Question 27

Given the declaration int *a;, the statement a = new int[50]; dynamically allocates an array of 50 components of the type ____.

A) int
B) int*
C) pointer
D) address

Question 28

Which of the following would be appropriate syntax for the heading of a copy constructor for a class called rulerType?

A) rulerType(int inches, int centimeters)
B) rulerType()
C) rulerType(const rulerType& myRuler)
D) copy rulerType(int inches, int centimeters)

Question 29

Given the statement double *p;, the statement p++; will increment the value of p by ____ byte(s).

A) one
B) two
C) four
D) eight

Question 30

The ____ constructor is executed when an object is declared and initialized by using the value of another object.

A) default
B) copy
C) struct
D) class

Question 31

Run-time binding is also known as ____ binding.

A) static
B) shallow
C) dynamic
D) deep

Question 32

In a ____ copy, two or more pointers have their own data.

A) shallow
B) deep
C) static
D) dynamic

Question 33

Consider the following declaration of a struct:
struct studentType
{
char name[26];
double gpa;
int sID;
char grade;
};
studentType student;
studentType *studentPtr;
The statement (*studentPtr).gpa = 2.5; is equivalent to ___________________ = 2.5;.

Question 34

Consider the following statements:
void pointerParameters(int* &p, double *q)
{
.
.
.
}
In the function pointerParameters, the parameter p is a(n) ____________________ parameter.

Question 35

Which of the following operations is allowed on pointer variables?

A) exp
B) %
C) ==
D) /

Question 36

An array created during the execution of a program is called a(n) ____ array.

A) list
B) static
C) execution
D) dynamic

Question 37

A class ____ automatically executes whenever a class object goes out of scope.

A) constructor
B) destructor
C) pointer
D) exception

Question 38

Consider the following statement: ptrMemberVarType objectThree(objectOne);
The values of the member variables of objectOne are being copied into the corresponding member variables of objectThree. This initialization is called the ____.

A) member-wise assignment
B) default assignment
C) member-wise initialization
D) default initialization

Question 39

In ____ binding, the necessary code to call a specific function is generated by the compiler.

A) static
B) dynamic
C) shallow
D) deep

Question 40

Which of the following arithmetic operations is allowed on pointer variables?

A) Increment
B) Modulus
C) Multiplication
D) Division

Question 41

Consider the following statements:
class shape
{
public:
virtual void draw() = 0;
virtual void move(double x, double y) = 0;
.
.
.
};
The code above is an example of a(n) ____________________ class definition.

Question 42

Consider the following statements:
int x;
int &y = x;
The second statement declares y to be a(n) ____________________ of x.

Question 43

The binding of virtual functions occurs at program ____________________ time.

Question 44

Once a class contains one or more pure virtual functions, then that class is called a(n) ____________________ class.

Question 45

An object of the base class type cannot be passed to a(n) ____________________ parameter of the derived class type.

Question 46

For classes with pointer member variables, you should include the copy constructor and the ____________________ in the class.

Question 47

The copy constructor automatically executes when, as a parameter, an object is passed by ____________________.

Question 48

The statement that declares board to be a pointer to a pointer is: int ____________________;

Question 49

The copy constructor automatically executes when the return value of a function is a(n) ____________________.

Question 50

The ____________________ of a base class automatically makes the destructor of a derived class virtual.