Chapter 9

Question 1

What does the indirection operator do?

Answer 1

It dereferences a pointer, allowing code to work with the value that the pointer points to

Question 2

What are the 3 different uses for the * operator?

Answer 2

1. multiplication operator
2. definition of a pointer variable
3. the indirection operator

Question 3

What mathematical operations are allowed on pointers?

Answer 3

Addition and subtraction

Question 4

Assuming that ptr is a pointer to an int, what happens when you add 4 to ptr?

Answer 4

It adds 4 times the size of an int to the address stored in ptr

Question 5

What is the purpose of the new operator?

Answer 5

To dynamically allocate memory

Question 6

What is the purpose of the delete operator?

Answer 6

to free memory that has been dynamically allocated with the new operator

Question 7

Under what circumstances can you successfully return a pointer from a function?

Answer 7

you should only return a pointer from a function if it is:

• a pointer to an object that was passed into the function as an argument
• a pointer to a dynamically allocated object

Question 8

Each byte in memory is assigned a unique ______.

Answer 8

Address

Question 9

The ______ operator can be used to determine a variable’s address

Answer 9

& (ampersand)

Question 10

_______ variables are designed to hold addresses.

Answer 10

Pointer

Question 11

The _______ operator can be used to work with the variable a pointer points to.

Answer 11

Indirection ( * )

Question 12

Array names can be used as ______, and vice versa.

Answer 12

Pointers

Question 13

Creating variables while a program is running is called.

Answer 13

Dynamic memory allocation

Question 14

The _____ operator is used to dynamically allocate memory.

Answer 14

new

Question 15

Under older compilers, if the new operator cannot allocate the amount of memory requested, it returns _____.

Answer 15

null (/zero)

Question 16

A pointer that contains the address 0 is called a(n) ____ pointer.

Answer 16

null

Question 17

When a program is finished with a chunk of dynamically allocated memory, it should free it with the _____ operator.

Answer 17

delete

Question 18

You should only use pointers with delete that were previously used with _____.

Answer 18

new

Question 19

[T/F]

Each byte of memory is assigned a unique address

Answer 19

true

Question 20

[T/F]

The * operator is used to get the address of a variable

Answer 20

false

Question 21

[T/F]

Pointer variables are designed to hold addresses

Answer 21

true

Question 22

[T/F]

The & symbol is called the indirection operator

Answer 22

false

Question 23

[T/F]

The & operator dereferences a pointer

Answer 23

false

Question 24

[T/F]
When the indirection operator is used with a pointer variable, you are actually working with the value the pointer is pointing to

Answer 24

true

Question 25

[T/F]

Array names cannot be dereferenced with the indirection operator

Answer 25

false

Question 26

[T/F]
When you add a value to a pointer, you are actually adding that number times the size of the data type referenced by the pointer.

Answer 26

true

Question 27

[T/F]

The address operator is not needed to assign an array’s address to a pointer

Answer 27

true

Question 28

[T/F]

You can change the address that an array name points to

Answer 28

false

Question 29

[T/F]

Any mathematical operation, including multiplication and division, may be performed on a pointer

Answer 29

false

Question 30

[T/F]

Pointers may be compared using the relational operators

Answer 30

true

Question 31

[T/F]

When used as function parameters, reference variables are much easier to work with than pointers

Answer 31

true

Question 32

[T/F]

The new operator dynamically allocates memory

Answer 32

true

Question 33

[T/F]

A pointer variable that has not been initialized is called a null pointer

Answer 33

false

Question 34

[T/F]

The address 0 is generally considered unusable

Answer 34

true

Question 35

[T/F]
In using a pointer with the delete operator, it is not necessary for the pointer to have been previously used with the new operatior

Answer 35

false