C pointers explained👉

Рет қаралды 154,283

Күн бұрын

C pointers tutorial example explained
#C #pointers #tutorial
void printAge(int *pAge)
{
printf("You are %d years old
", *pAge); //dereference
}
int main()
{
// pointer = a "variable-like" reference that holds a memory address to another variable, array, etc.
// some tasks are performed more easily with pointers
// * = indirection operator (value at address)
int age = 21;
int *pAge = &age;
printAge(pAge);
//printf("address of age: %p
", &age);
//printf("value of pAge: %p
", pAge);
//printf("size of age: %d bytes
", sizeof(age));
//printf("size of pAge: %d bytes
", sizeof(pAge));
//printf("value of age: %d
", age);
//printf("value at stored address: %d
", *pAge); //dereferencing
return 0;
}

Пікірлер: 144

@mindlessmeat4055 Жыл бұрын

Anytime I need to know something about programming, your channel is the first one I look for.

@HiiImChris Жыл бұрын

Just some advice.to truly understand this concept is a thorough way to apply it to your programs, I think it's best to take it slow. Don't feel bad, in my lecture I slowly and methodically took notes for hours on a 30 minute video to grasp the idea as a noob. It's ok to take your time, not all of us are coding gods. The only objective you should have is understanding it, and for each person that learns differently it's going to take varying time. As long as you come out with the knowledge, than your knowledge is just as effective as anybody elses.

@SK-ow4vw Жыл бұрын

I think that the conceptual problem about pointers begins much earlier than you might imagine. For example, let's take 'int age = 21" You said the integer 'age' has a value 21 AND an address. I then could easily say "well it also has a name 'age'. So now my question would be 'where is the string 'age' stored, where is the 'address' stored and where is the value stored.' Then I would ask 'how do you get to the actual integer value from the string 'age'? Surely to humans the string 'age' IS A POINTER to the value 21. So there is even confusion BEFORE one starts speaking about 'normal' pointers. As far as I understand it the compiler completely removes any reference to the string 'age'. Does it therefore replace the string 'age' in assembly code with the address where we can find the value 21? If so, the address that appears in the machine code IS A POINTER also to the value 21. Unfortunately we now don't have a name for it. So this whole issue for some of us needs to be cleared out of the way first before we can even start to talk about pointers. So in a nutshell: we need to know precisely what happens to the string 'age' in machine code.

@sueyourself5413 Жыл бұрын

@@SK-ow4vw No, no we don't. It's a reference of text, not a string.

@onlyeyeno Жыл бұрын

@@sueyourself5413 I believe You actually strengthened "*Sk-ow4vw*"s argument, by seemingly missing his point... As I read his comment, the "issue" is not if the "variable-name" (age) is a string or some other "datatype". Rather according to Sk-ow4vw the "crux" of this is the fact that when describing (and thinking about" the "concept of a variable", it has both and address, a value (held at that address) AND a "variable-Name". And so when explaining Pointers in a way that totally neglects to even mention the "handling and destiny" of the "variable name" You risk to "loose/confuse" people who think that "one step further". At least that's how I read SK-ow4vw's comment. Best regards.

@spooders8943 2 жыл бұрын

this was the clearest way someone has ever explained pointers to me. thanks

@katarinaclaes2975 4 ай бұрын

nice explanation, your tips on what's good practice makes it way easier to understand

@tybargky461 Жыл бұрын

As a CS major @ Virginia Tech, you have blessed me with a foundation that builds my confidence!

@tybargky461 Жыл бұрын

@@d0ubleyouteef You go to tech?

@dinnersandvich9329 Жыл бұрын

@@d0ubleyouteef what?

@preethi2802 5 ай бұрын

Finally got a clear insight into what all these denotations in pointers mean. Thanks a ton, bro

@abhishekmaurya8330 2 жыл бұрын

Awesome sir keep it up. You have nice way of explanation

@juliannafotheringham7101 Жыл бұрын

great explanation, very clear, thank you!

@jamesharland3727 Жыл бұрын

This is really clear, thank you! Got me though a mental block I was having on Codecademy

@FrancisAlexanderWood0 25 күн бұрын

Wanted to watch your video in the background and got caught up. Thank you

@ajitghising8112 6 ай бұрын

You cleared my mind about pointer with one view. Thanks a lot. I will be coming to check more videos from your channel. I’m learning c atm. Really appreciate man 🎉

@NNNedlog 2 жыл бұрын

your vids are always easy to follow along. Thanks a lot

@advance6846 3 ай бұрын

r you black gojo

@barsceylan4559 Жыл бұрын

Dude wtf!! You are a savior !!

@accumulator4825 Жыл бұрын

Could you do a Scala series? That'd be so cool

@BroCodez 2 жыл бұрын

#include void printAge(int *pAge) { printf("You are %d years old ", *pAge); //dereference } int main() { // pointer = a "variable-like" reference that holds a memory address to another variable, array, etc. // some tasks are performed more easily with pointers // * = indirection operator (value at address) int age = 21; int *pAge = &age; printAge(pAge); //printf("address of age: %p ", &age); //printf("value of pAge: %p ", &pAge); //printf("size of age: %d bytes ", sizeof(age)); //printf("size of pAge: %d bytes ", sizeof(pAge)); //printf("value of age: %d ", age); //printf("value at stored address: %d ", *pAge); //dereferencing return 0; }

@giaminhpham2281 2 жыл бұрын

can you make another code that use cin, cout pleaseee

@tyvan5973 Ай бұрын

Thank for your sharing!

@jesuschrist2029 16 күн бұрын

I watched several videos few months ago and did not understand a single thing, I happen to stumble across this video I completely understood everything thanks bro

@SleepyAizawa69 4 ай бұрын

Hey bro thank you for your smooth well explained videos!❤

@seyhaseng1077 2 жыл бұрын

It would be awesome if u teach or solve the problems of languages

@stephensagarinojr.4170 Жыл бұрын

I would really be glad if you'd make a video about double pointers. Many videos are on youtube but it hard to understand it. and when I watch your videos, I can understand it easily. I am so thankful for all the tutotiral you made

@A1cJ121 7 ай бұрын

A double pointer is essentially a pointer that holds the value of the memory address of another pointer. int x= 5; int *pX = &x; int **pPX = &pX;

@provokator-provocateur7603 2 жыл бұрын

Great video. Can you make video about void pointers, array pointers, struct pointers as well?

@finndemoncat9379 Ай бұрын

Void pointers don't have a data type reference. You can store any type of data in it and convert to other data type. Struct pointers work just like a struct variable, the main difference it's the syntax. You can also use it to dinamicaly alocate memory to create an array of pointers. I don't know what you mean by array pointer, but you can do as like (*ptr = x[y]) and it will show either the value of it or function as a substring.

@omarabbas6541 Жыл бұрын

bro , you deserve more than like , comment and subscribe. You are amazing mashaAllah

@literalspam6894 Ай бұрын

had to watch this vid a couple times before i got it, very good explanation

@vesnapezer683 3 ай бұрын

I love you seriously

@eeneemeenee6236 Жыл бұрын

You're awesome bruh

@tylersantiago3810 9 ай бұрын

bro, idk who you are, I don't know where you've been, idk what you do, but thank you, I love you 3000. I just watched this video and understood everything about pointers. It took my professor 3 class sessions to do so and I still didn't get it.

@altprsn6929 11 ай бұрын

Thank you!

@brahimkazzi5281 3 ай бұрын

Thank you bro best course

@nocpich 6 ай бұрын

thanks! it helped me a lot

@ahiamatagabriel5696 2 жыл бұрын

Thank You.

@Frozenflames-si8ch 4 ай бұрын

good

@lookwithme3083 2 жыл бұрын

I have a question how can somebody make so amazing hell videos.

@hakant.5806 7 ай бұрын

Pretty useful

@finndemoncat9379 Ай бұрын

Pointers are life. There are many tricks using pointers and strings along strstr and strrch. If you use any of these functions to return a pointer with the ocurrence of x string you can subtract it of the original array and get the number of chars.

@Nathan00at78Uuiu 7 ай бұрын

love being a fellow bro.

@NataKami21 23 күн бұрын

Bro code --> The best lecturer ❣

@joevaghn457 4 ай бұрын

I've never really grasped why pointers are somehow really hard to understand for some people. I'm not trying to be condescending. I'm really not! It's literally a memory address. There's nothing more to think about other than type casting pointers and pointer arithmetic, imho. When using pointers, all your doing is working with the address of something that exists somewhere else in memory. Good video tho, it was really useful. I honestly find useful

@Stvbcn 3 ай бұрын

As a beginner my issues with understanding have been: - Why the need to define the type of the underlying value if we are always talking about its address? - Why confusingly re-use the asterisk for different, but associated purposes.

@joevaghn457 3 ай бұрын

@@Stvbcn ah, So the type-of-pointer thing is so that the compiler knows how many bytes to advance the pointer ( pointer arithmetic: ++, +=, etc ). The reuse-of-asterisk is just for declaration. All I care about is if the asterisk is on value, it’s a dereference, if it’s on a declaration, then it’s a pointer. I hate dealing with multidimensional pointers beyond 3 levels. That stuff is extreme lol

@justiceessiel6123 7 ай бұрын

I have understood golang pointers by understand C pointers

@ucheogordiunor4020 7 ай бұрын

Great video,can you make video on creating a simple shell in C

@naveenkumar1853 8 ай бұрын

Excellent😊😊😊

@user-tp8gj6fu3n 9 ай бұрын

love this

@issker8840 Жыл бұрын

thx!

@redmor 2 жыл бұрын

thanks bro

@Harshi998i Ай бұрын

best info on pointers out there ,

@tushar8983 Жыл бұрын

way too underrated

@hoyorkilleader6021 Жыл бұрын

Mitico!

@krateskim4169 11 ай бұрын

nice video

@banlmao1707 16 күн бұрын

can you make a video on how you get c to output cleanly like yours on visual studio?

@sanjaykannan4549 Жыл бұрын

top G

@izawasinsie55 5 ай бұрын

U saved me in exams

@frzy970 9 ай бұрын

thanks😄

@ironmonkey1990 4 ай бұрын

very nice

@danielndobe1257 Жыл бұрын

awesome

@aymanbou4847 7 ай бұрын

The best

@LieutenantButtonMasher Ай бұрын

Mental notes: 1) You declare a pointer by succeeding the data type in the variable declaration with an asterisk *. eg: int *p = NULL; 2) You can get the address of a variable by preceding it with an ampersand &. eg: '&age' gets the address to the variable age and can be stored in a pointer type variable. 3) To dereference a pointer you precede it with an asterisk in order to access the value at the stored address. 4) Always good to assign NULL to a pointer that doesn't yet have a value assigned to it.

@NoufM-ls2pv Ай бұрын

I love you

@tybargky461 Жыл бұрын

I LOVE YOU

@Jashwanth.G Ай бұрын

Did bro said sit BACK relax and enjoy just like tharun kumar the fitness KZfaqr

@giaminhpham2281 2 жыл бұрын

This video is great.

@spencersedano Жыл бұрын

In what situations should I use pointers?

@RJ-or8bw 10 ай бұрын

If you need to use a lot of memory that’s not standard size. If you have a struct that contains a lot of different data types, you would use a pointer to this huge chunk of data to get it all.

@danegaming9080 9 ай бұрын

nice

@orangejuice7247 Жыл бұрын

it entered uncharred territory im WHEEZING

@pratiknvlogs Жыл бұрын

Which compiler and IDE is best to practice programming

@icantthinkofaname5558 Жыл бұрын

i use visual studio and mingw64 for C

@boyar3033 7 ай бұрын

Thanks Biggus Chaddus

@14Elijah 3 ай бұрын

I prayed 😇🙏

@DelilBalci 7 ай бұрын

Brooo... This channel is absolutely great!

@ameenalrawbdeh767 2 ай бұрын

i love you

@OMNI_INFINITY 11 ай бұрын

Would have been good to include a proper function and call. That was reason watched. Sigh…

@salih.karahan 2 жыл бұрын

Elhamdülillah 🤲🏻🤲🏻 I found one video that isn't hindi english accent

@shavilagt1072 Жыл бұрын

hocam öğrendiniz mi c'yi?

@SHOURYAAAA Жыл бұрын

Lmao. The problem is with you. I wont blame Indian people just because hindi is their language and are better at programming than the people of your country.

@diversiontv777 Жыл бұрын

I hate hindi

@OMNI_INFINITY 11 ай бұрын

Haha. Translation: Found a video that is trustworthy.

@burstfireno1617 6 ай бұрын

😅

@gustavo-rios Жыл бұрын

This is a comment for the youtube algorithm

@shervin9561 7 ай бұрын

Thanks

@Atomos_tech Жыл бұрын

Thanks for the video, but there is something I am wondering about why the address is changing always when I restart the program !?

@heyaglitz Жыл бұрын

It's because your program won't always get assigned the same range of memory by Windows, it's normal and it's intended to be like that.

@Atomos_tech Жыл бұрын

@@heyaglitz OK, thank you

@Jordan-qi2dn 2 ай бұрын

In the example where you compare the sizes of the int variable and the pointer variable, why is the pointer 8 bytes and the age variable 4 bytes? Is the pointer variable larger due to it being a hexadecimal?

@michiDerMatt 2 ай бұрын

The size of the pointer depends on if its running on 32 or 64 bit architecture right?

@entropic7768 6 ай бұрын

2nd time its really clicking for me, probably going to have to relearn this like 20 times lmao

@Garrison86 2 жыл бұрын

Leaving a random comment down below.

@SoloRush-hl8jv Жыл бұрын

hey ya bro

@PSIwolf39 7 ай бұрын

Here's some code I wrote using pointers: #include #include #include #include #include #include #include void addition(int firstNumber, int secondNumber, int *pResult){ *pResult = firstNumber + secondNumber; } int main(){ int firstNumber = 20; int secondNumber = 39; int result; int* pResult = &result; addition(firstNumber,secondNumber,pResult); printf("%d+%d=%d",firstNumber,secondNumber,result); }

@miltonestepario Ай бұрын

thank you Bro!!!!

@fadiloumarou8280 2 жыл бұрын

if we declare the pointer as int *pAge; then pAge = &age does the compiler consider *pAge as a null value?

@dotcomwhiz 2 жыл бұрын

nope it will assign an arbitrary integer at that address

@stutikalan8265 8 ай бұрын

I told my dad that I was taking a C programming course.... He offered to give me some pointers

@bhoumik911 8 ай бұрын

letsgo

@randerins Жыл бұрын

Looks like heavy depression.

@dumcatgaming 7 ай бұрын

yea im still confused

@Jordan-qi2dn 2 ай бұрын

This channel is good, but I think you need to structure your videos better. What I mean is that you should do a better job of separating the examples you do instead of editing previous examples for the next ones for the sake of better comprehension. More comments would also be helpful to understand what exactly you're trying to convey. Thanks for teaching me python and C though!