POINTERS CHECK

Question 1

The ______ and _______ operators can be used to increment or decrement a pointer variable.

Accepted Answer

++, --

Question 2

When using the new operator with an older compiler, it is good practice to:

Accepted Answer

test the pointer for the NULL address

Question 3

The statement cin >> *num3;

Accepted Answer

stores the keyboard input into the variable pointed to by num3.

Question 4

In the context of memory segmentation, where are machine instructions typically stored?

Accepted Answer

Code

Question 5

When you work with a dereferenced pointer, you are actually working with:

Accepted Answer

actual value of variable whose address is stored in the pointer variable

Question 6

With pointer variables, you can __________ manipulate data stored in other variables.

Accepted Answer

indirectly

Question 7

Every byte in the computer's memory is assigned a unique

Accepted Answer

address

Question 8

What will the following code output? int number = 22; int *var = &number; cout << *var << endl;

Accepted Answer

22

Question 9

What does the following do? ptr1 == ptr2

Accepted Answer

It compares the addresses stored in the pointers.

Question 10

Use the delete operator only on pointers that were

Accepted Answer

created with the new operator

Question 11

What is the difference between 'delete' and 'delete[]' in C++?

Accepted Answer

'delete' is for single objects, 'delete[]' is for arrays

Question 12

Which statement displays the address of the variable num1?

Accepted Answer

cout << &num1;

Question 13

These can be used as pointers.

Accepted Answer

Array names

Question 14

Not all arithmetic operations may be performed on pointers. For example, you cannot ________or __________ a pointer.

Accepted Answer

multiply, divide

Question 15

The statement int *ptr; has the same meaning as

Accepted Answer

int* ptr;

Question 16

What is a dangling pointer?

Accepted Answer

A pointer that points to deallocated memory

Question 17

What will the following statement output?int num1 = 3;cout << &num1;

Accepted Answer

The memory address of the variable called num1.

Question 18

In the context of memory segmentation, where are parameters and local variables typically stored?

Accepted Answer

Stack

Question 19

Look at the following statement:int *ptr;In this statement, what does the word int mean?

Accepted Answer

ptr is a pointer variable that'll store the address of an integer variable

Question 20

If a variable uses more than one byte of memory, for pointer purposes its address is:

Accepted Answer

the address of the first byte of storage.

Question 21

Which of the following is a valid way to declare and initialize a pointer to an integer in C++?

Accepted Answer

int *ptr = &x;

Question 22

What is the result of the expression *(a + 2) if 'a' is an array of integers?

Accepted Answer

The value of the third element in the array

Question 23

In the context of memory segmentation, where are dynamically allocated variables typically stored?

Accepted Answer

Heap

Question 24

Assuming ptr is a pointer variable, what will the following statement output?cout << *ptr;

Accepted Answer

the value stored in the variable whose address is contained in ptr.

Question 25

Look at the following statement:sum += *ptr++;This statement...

Accepted Answer

assigns dereferenced pointer's value, then increments the pointer's address

Question 26

What is the purpose of the 'const' keyword when used with pointers?

Accepted Answer

Both A and B are possible uses

Question 27

What is a memory leak in C++?

Accepted Answer

When memory is allocated but never deallocated

Question 28

True/False: It is legal to subtract a pointer variable from another pointer variable.

Accepted Answer

True

Question 29

What does the following do? &ptr1 == &ptr2

Accepted Answer

It compares the addresses of the pointers

Question 30

int numbers[] = {0, 1, 2, 3, 4 }; int *ptr = numbers; ptr++; After this code executes, _______

Accepted Answer

ptr will hold the address of numbers[1]

Question 31

A function may return a pointer, but the programmer must ensure that the pointer _________.

Accepted Answer

still points to a valid object after the function ends

Question 32

What's d output? int *numbers = new int[5]; for (int i = 0; i <= 4; i++) *(numbers + i) = i; cout << numbers[2] << endl;

Accepted Answer

2

Question 33

True/False: An array name is a pointer constant because the address stored in it cannot bechanged during runtime.

Accepted Answer

True

Question 34

Which of the following statements is not valid C++ code (assume num1 was declared as a float)?

Accepted Answer

All of these are invalid

Question 35

The _________ , also known as the address operator, returns the memory address of a variable.

Accepted Answer

ampersand ( & )

Question 36

When this is placed in front of a variable name, it returns the address of that variable.

Accepted Answer

ampersand ( & )

Question 37

True/False: C++ allows a pointer to be assigned an address outside an array’s boundaries.

Accepted Answer

True

Question 38

The contents of pointer variables may be changed with mathematical statements that perform:

Accepted Answer

addition and subtraction

Question 39

A pointer with the value 0 (zero) is called a NULL pointer.

Accepted Answer

True

Question 40

What is the purpose of the '&' operator when used with a variable?

Accepted Answer

To obtain the address of a variable

Question 41

What is the significance of using 'nullptr' in C++?

Accepted Answer

It is a keyword used to initialize pointers to a null state.

Question 42

A pointer variable is designed to store

Accepted Answer

a memory address.

Question 43

The statement int *ptr = new int;

Accepted Answer

assigns an address to the variable named ptr.

Question 44

What is the purpose of the 'delete' operator in C++?

Accepted Answer

To deallocate memory on the heap

Question 45

A pointer may be initialized with

Accepted Answer

A and B

Question 46

What is the purpose of the 'new' operator in C++?

Accepted Answer

To allocate memory on the heap

Question 47

A pointer to a variable can be used as a function argument, giving the function direct access to the original variable.

Accepted Answer

True

Question 48

Which of the following are potential risks of using pointers?

Accepted Answer

A and C

Question 49

Which of the following describes a possible effect of using the const keyword with pointers in C++?

Accepted Answer

A and B

Question 50

A pointer variable may be initialized with

Accepted Answer

any address in the computer's memory allowed by the Operating System.

Question 51

What does the term 'dereferencing' mean in the context of pointers?

Accepted Answer

Accessing the value stored at the address held by a pointer

Question 52

What does the following do? *ptr1 == *ptr2

Accepted Answer

It compares the values stored at the addresses pointed to by the pointers.

Question 53

When the less than ( < ) operator is used between two pointer variables, the expression is testing whether

Accepted Answer

address of first variable comes before address of second variable in memory

Question 54

True/False: The ampersand (&) is used to dereference a pointer variable in C++.

Accepted Answer

False

Question 55

What is the purpose of using double pointers (e.g., int**)?

Accepted Answer

To store the address of a pointer

Question 56

Dynamic memory allocation occurs

Accepted Answer

when a new variable is created at runtime

Question 57

What will the following code output? int number = 22; int *var = &number; cout << var << endl;

Accepted Answer

The address of the number variable

Question 58

Both of the following do the same thing: cout << myValues[index] << endl; cout << *(myValues + index) << endl;

Accepted Answer

True

Question 59

In the context of memory segmentation, where are pointers typically stored?

Accepted Answer

Stack

Question 60

Which of the following correctly describes a dangling pointer?

Accepted Answer

A pointer that points to a memory location that has been deallocated

Question 61

In pointer arithmetic, what does the expression 'ptr + 1' do?

Accepted Answer

Moves the pointer to the next element of the type it points to

Question 62

Look at the following statement:sum += ++*ptr;This statement...

Accepted Answer

increments the dereferenced pointer's value by one, then assigns that value

Question 63

What does the following statement do?double *num2;

Accepted Answer

Declares a pointer variable named num2.

Question 64

What is the primary difference between stack and heap memory allocation?

Accepted Answer

Stack is static, heap is dynamic

POINTERS CHECK

Questions 67

POINTERS CHECK

Questions 67