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00:00:12

good day, friends, today

00:00:17

our topic is pointers and we will talk

00:00:20

to you about the

00:00:22

address operator, dereferencing operator,

00:00:27

pointer and

00:00:29

something like that and what are the benefits of

00:00:35

pointers, let's get started, let's first

00:00:42

define

00:00:44

what a pointer is, a pointer is a

00:00:47

variable that points to the

00:00:52

memory address of Hermione, let's hand over Let's look

00:00:58

at an example

00:01:00

that was clear: we declare such

00:01:05

a variable

00:01:13

and declare a pointer of the same type, that

00:01:17

is, a pointer and they come in different types.

00:01:23

We now, in order to work with the

00:01:28

inter variable, create a pointer, declare a

00:01:35

pointer of the same type, that is, and don’t

00:01:42

forget the asterisk,

00:01:43

that is, without this we have The result is usually a

00:01:47

variable. there is no we write now

00:01:52

we have this is a regular variable of

00:01:55

integer type and if we add

00:01:57

an asterisk it is already a pointer so we display it

00:02:02

on iq, well, let’s enter a simple one at the beginning

00:02:23

and everything works then the

00:02:30

symbol is used so that at

00:02:35

the moment this symbol is used

00:02:37

to declare this pointer point to the

00:02:40

5th, that is, pointer

00:02:43

peter because points in English are a

00:02:46

pointer, but if we took it anyway,

00:02:51

nothing will work, we need to assign

00:02:55

the address to the pointer five,

00:03:01

then we’ll do this and

00:03:13

comment out gray for now, we

00:03:15

got it here like this at the beginning

00:03:19

we declare the

00:03:22

pyramid variable 10 peter and the pointer and this

00:03:28

pointer

00:03:29

the pointer points to these

00:03:34

and here we

00:03:36

enter on the screen using the pointer,

00:03:40

but here we now have such an

00:03:45

interesting thing, or what can we

00:03:48

call it, how do we see us here, not the

00:03:53

values, hey, but like some strange

00:03:56

numbers, this is the storage location in the memory of the

00:04:02

pay variable,

00:04:05

that is, what do we need to do so that

00:04:09

the value of this variable appears, for

00:04:14

this we use the

00:04:16

dereferencing operator this asterisk in

00:04:20

English we enter the reference to filter

00:04:26

on the screen

00:04:27

and everything is fine again such a joke such a

00:04:32

cool thing and look 5 equals

00:04:39

let's say now we have will produce a

00:04:43

program error, say 120, we admit why

00:04:51

the error is because

00:04:54

in order to work directly with the

00:04:57

value of the variable we need to work

00:05:03

with the dereference operator, that is,

00:05:08

an asterisk and do the following

00:05:36

we change snakes ice here the value hey that

00:05:43

is, the pointer points to and and if we

00:05:48

change here or declare like here

00:05:51

shown, in fact, we are

00:05:55

changing the value here and since this Peter

00:05:59

our pointer points here, what

00:06:04

will happen if we do this, let’s do this,

00:06:07

so I’m not five kopecks,

00:06:11

what do you see as we see, first we have a

00:06:20

variable and then Peter and to

00:06:26

we assigned the assignment there we assigned the value there,

00:06:29

well, at least they assigned it points to and it

00:06:32

will be more accurate and then we

00:06:41

haven’t worked with and here,

00:06:45

but for some reason, instead of ei 120,

00:06:50

come up how convenient it is to work with a

00:06:54

pointer, this is a class,

00:06:55

but in the beginning maybe It’s a little confusing

00:06:58

with these declarations

00:07:03

by assigning the value to the

00:07:06

assignment of the address, but with practice everything

00:07:11

will be

00:07:15

clear

00:07:18

now that you can use the

00:07:23

website main points here is the

00:07:29

dereferencing operator here is also the

00:07:36

assignment operator and the rest everything seems

00:07:40

clear now let’s do everything like this if it’s

00:07:48

just a persian

00:07:49

ampersand and we have streets and the address of this variable will be displayed on

00:07:56

the screen the

00:07:57

address of the

00:08:03

cell variables the address of the cell, more precisely where

00:08:06

the variable is stored, that means

00:08:12

without these same assignment and

00:08:18

dereference operators, we had

00:08:22

the compiler give an error,

00:08:28

for example, with a five, the address will appear here

00:08:37

and now the value

00:08:49

is all

00:08:53

now I’ll tell you a few words about the size of

00:08:57

pointers and the size of the pointer depends on the

00:09:02

architecture on which the

00:09:05

executable file is compiled and viewed, and a 32-bit

00:09:11

executable file uses 32-bit

00:09:14

memory addresses and therefore a pointer

00:09:19

on a 32-bit device occupies 32 bits

00:09:23

and four bytes. Let’s use it in the

00:09:28

site command Peter’s pointer name

00:09:46

8

00:09:51

means I have a 64-bit one system

00:09:56

architecture that's all,

00:10:00

and finally, if you are going to

00:10:08

declare several pointers at once,

00:10:10

for example, int letter b

00:10:21

king

00:10:23

57,

00:10:29

this is also an option for

00:10:33

declaring a pointer, but this is a valid

00:10:37

option, but undesirable, so what

00:10:40

happens here is Peter by, we have a

00:10:45

pointer of type int here Peter this is an

00:10:50

ordinary variable for us, not a pointer,

00:10:55

that’s why this option

00:10:58

is allowed, but it’s undesirable if we do it like

00:11:03

this, we have two pointers 5 arbe and

00:11:10

St. Petersburg residents, that’s all for our first lesson about

00:11:20

indicators and thanks for

00:11:24

watching

00:11:25

if you have any suggestions for

00:11:28

about improving the channel here is sonic and

00:11:31

content and you write in the comments it will be

00:11:35

interesting

00:11:38

complaint

Description:

Указатели куда они указывают?))) оператор адреса - address #operator оператор разыменования - #dereference operator

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