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  • ruRussian
Download
00:00:02
video. In this video I would like to
00:00:04
explain to you what pointers are and how you
00:00:08
can create a pointer, the C and what it has to
00:00:11
do with the steak and in the hip if you
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generally have a bit of
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programming now, educate yourself further. Volt
00:00:16
stays until the end Well, I have
00:00:18
another hot tip for you, let's
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start now, so normally
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we have something like variables in which is
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equal to two and if we now
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want to output the console then
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nothing special happened, I say
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then we just give the value from the
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variable and if we see the lizard on the
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outside we simply output 2.
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Now you may already know that you
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can output the memory address of a variable
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with the and in front of the variable name
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and we want that to be short, they are
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output in hexadecimal form, i.e.
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addresses are usually specified in
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programming languages ​​in hexadecimal form,
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what exactly are extra decimal numbers
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they are just now no matter the
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simply different number system and this
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he has this variable is currently at
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the address 0x 61 ff 2 c this is the
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memory address and this is now available
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The stick has all the normal variables on the stack,
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i.e. everything that doesn't have to
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do with pointers, like let's say
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if we now
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want to create a display and that works, for example,
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with and asterisk j then let's say j
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is equal to and asterisk mallock of
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size of intent are of course written in lower case
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what we are saying here okay there is
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this variable of the type intel this
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asterisk is a pointer in the German
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pointer with the name j and here the
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right side of the same sign
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simply says please reserve me on
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the cut memory for an integer
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variable so reserve memory on
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the neighborhood
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and this is the right bathroom so the right
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is equal to that you can now do this
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over several lines from storage let's do
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it maybe like this it will be the same and
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this is easy to create in friend
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with this name j&j points then that's why
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the pointer is called this memory
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which is now marked in blue here the
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pointer points to what I mean by that we
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can take a quick look at that
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we enter the value of j on the one hand
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index adc painter form then the address
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of j and the actual value on the
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j shows these are now three different
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cases that you should remember for pointers,
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that means for me I'll briefly go through the three cases and
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then I'll go through the three cases, ok
00:03:02
we can see up here that it's a gift,
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namely 2 and this topic dresse
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out so if I say again here
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is the same and here it is
00:03:13
and this is equal to a small i then
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here we have
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j is equal and js is equal and asterisk
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j equalizes that with the serenade of
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will perhaps be the most to you right now,
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I will do that in a moment Let's explain to
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me the goal of the value of it on the 62,
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the memory address of the variable is
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now this and now with the j
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we have three different cases. On
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the one hand, we see that the
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actual content of j
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is again some memory address, which
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means we can do that Save us janz
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comment
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then we see here the memory address
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of j itself is different and that is
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perhaps the confusing point
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and that is perhaps
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the confusing point and the value of j for
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that we have to set the course first
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so that that What makes sense is that
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we want to
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store 12 for a long time, for example. It's half past eleven, so
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it's always equal to 12 and I
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'll show you a little
00:04:23
graphic artist again. In fact, you can
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say that this pointer j is on the
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stick, so it's the address of j itself
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and j is on the stick at the address
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that the reporter points to, which is on the
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chop and this twelve is stored on the chip,
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which actually means at the
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memory address that we have here there
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is the value 12 stored that that
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is here on the cut that is on the
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keeper the pointer itself so the
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pointer j is on the stick at
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this memory address but it points
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to the path it points to the keeper the
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pointer j is on the stick but points
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to the cut and the The name of the memory is
00:05:11
that we have reserved it here at this point
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and have now saved some value there,
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something else could
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be 24 36 it was but that's how
00:05:20
you can imagine them as normal variables
00:05:22
are on the stick and you will
00:05:24
work with pointers, you always have to have
00:05:26
memory At the very least, reserve
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at least that the sensible
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use of point yes and you can
00:05:33
also play races that have the length
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in which a dependency on a
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changeable variable but these
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are still topics for another
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moment for now you can
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remember That's how pointers work and that's how you
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can introduce yourself with the addresses.
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I'll do that now.
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We recently had a look at it again graphically and
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now look at the example here.
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So now that I've looked at it in the feces,
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we're now here
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again in a small drawing program.
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I want to now Go into it again in detail
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because she really understood it,
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so if we now say we
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actually somehow have a number in it that
00:06:09
is equal to two, it will now be
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stored somewhere in memory, that is,
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if we are somewhere in the stack, i.e. in
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normal memory, the variable ii is equal
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two filed that means I'll write
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the name here in the top corner
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here is the value and there is now
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some memory dress 0x for example
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if we now create a pointer again
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let's say now and asterisk j&j is
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the same time attracts bla bla bla bla blah what
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should we do now came so we
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reserve memory on the i then
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we now have something on the i the
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question is what should I do now so at once
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we have
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reserved memory and if we now
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say for example asterisk j is equal to
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ten there is this 10 on the bat
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this is the 10
00:07:08
and this variable has no name on
00:07:10
the table seen like this called go the wool
00:07:12
with this mallock command
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reserves the pointer that we now
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have these asterisks j so the j
00:07:18
pointer is again located on the stack,
00:07:21
that is, j is on the stick and, viewed
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this way, points to the cut and if
00:07:27
we have the memory address 0 xf as our target,
00:07:31
then this pointer has saved the asterisk j as the
00:07:35
value 0 xf and now places itself
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at some memory address, for example
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this one Arbitrarily made up
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memory addresses, which means the pointer
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is also on the stick but also shows
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the memory that we have presented here,
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which means here is the stack and here
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is the hit
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and that's all the magic when
00:08:02
we then output it to the console
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want j then j is equal to zero I
00:08:25
wanted to show you the pointers shortly. If you
00:08:28
also want to improve your C programming skills
00:08:30
then I can recommend that
00:08:32
you take a look at the video description.
00:08:33
I have linked you to my C
00:08:34
programming schools on the i
00:08:36
for a special discount for nine
00:08:38
euro 99 you are welcome to take a look at it
00:08:41
otherwise maybe we will see each other again
00:08:42
in another video
00:08:43
I wish you something or Rheingau

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