Pointers

Question 1

How can i get the address of the variable A?

Answer 1

&A will return the address of the variable A

Question 2

What is the following coded doing?

int v = 42;
int *ptr = &v;

Answer 2

Creating a integer variable, and storing the address of this variable in the integer pointer ptr.

Question 3

How many bits does a pointer take up?

Answer 3

This depends on the system architecture.

Question 4

typedef struct {int a} mystruct;

mystruct m = {10};
mystruct *ptr = &m;

How can I access the a attribute of m using its pointer?

Answer 4

*(ptr).a;

Question 5

Why are pointers useful in function calls?

Answer 5

Allow us to avoid having to pass large data structures, which requires a lot of copying

Allows us to return multiple values in a function call

Allows us to pass a variable by reference

Question 6

What does the arrow operator -> do?

p->A

Answer 6

First it de-references the pointer p, and then it accesses the attribute A.