C pointers explained👉
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- Опубликовано: 12 июн 2024
- 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;
} 
Наука
Anytime I need to know something about programming, your channel is the first one I look for.
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.
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.
@@SK-ow4vw No, no we don't. It's a reference of text, not a string.
@@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.
As a CS major @ Virginia Tech, you have blessed me with a foundation that builds my confidence!
@@d0ubleyouteef You go to tech?
@@d0ubleyouteef what?
nice explanation, your tips on what's good practice makes it way easier to understand
this was the clearest way someone has ever explained pointers to me. thanks
Great video. Can you make video about void pointers, array pointers, struct pointers as well?
Finally got a clear insight into what all these denotations in pointers mean. Thanks a ton, bro
Awesome sir keep it up. You have nice way of explanation
great explanation, very clear, thank you!
This is really clear, thank you! Got me though a mental block I was having on Codecademy
Could you do a Scala series? That'd be so cool
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 🎉
#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;
}
can you make another code that use cin, cout pleaseee
Dude wtf!! You are a savior !!
your vids are always easy to follow along. Thanks a lot
r you black gojo
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
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;
It would be awesome if u teach or solve the problems of languages
Thank you bro
best course
I love you seriously
Hey bro thank you for your smooth well explained videos!❤
I have understood golang pointers by understand C pointers
Thank you!
Thank You.
bro , you deserve more than like , comment and subscribe. You are amazing mashaAllah
Excellent😊😊😊
thanks! it helped me a lot
You're awesome bruh
Pretty useful
thanks bro
love this
thx!
Great video,can you make video on creating a simple shell in C
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.
I have a question how can somebody make so amazing hell videos.
top G
love being a fellow bro.
good
nice video
The best
thanks😄
awesome
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.
Mitico!
way too underrated
I prayed 😇🙏
very nice
This video is great.
Thanks Biggus Chaddus
i love you
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
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.
@@SteveCatalunyaSE 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
nice
Which compiler and IDE is best to practice programming
i use visual studio and mingw64 for C
U saved me in exams
Thanks
The size of the pointer depends on if its running on 32 or 64 bit architecture right?
In what situations should I use pointers?
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.
I LOVE YOU
Brooo... This channel is absolutely great!
amen
Leaving a random comment down below.
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?
Thanks for the video, but there is something I am wondering about why the address is changing always when I restart the program !?
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.
@@heyaglitz OK, thank you
it entered uncharred territory im WHEEZING
letsgo
This is a comment for the youtube algorithm
hey ya bro
if we declare the pointer as
int *pAge;
then pAge = &age does the compiler consider *pAge as a null value?
nope it will assign an arbitrary integer at that address
2nd time its really clicking for me, probably going to have to relearn this like 20 times lmao
Would have been good to include a proper function and call. That was reason watched. Sigh…
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!
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);
}
Looks like heavy depression.
Makes sense but I bet it’s difficult to apply
I told my dad that I was taking a C programming course....
He offered to give me some pointers
yea im still confused
From a bro
sanks here's a comment.
Elhamdülillah 🤲🏻🤲🏻 I found one video that isn't hindi english accent
hocam öğrendiniz mi c'yi?
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.
I hate hindi
Haha. Translation: Found a video that is trustworthy.
😅
comment...
r u 21 years old?
why didnt you go through memory management
why didnt u explain memory management
i still dont understand the use case..
❤❤❤❤❤❤❤❤❤❤💕💕💕💕💕💕💕💕💕💕💕💕💕💕💕💕❤❤
comment
一直觉得挺难理解的，大一的C语言期末考还挂了，hh
printf("value of pAge: %p
", pAge); Ehh how can this be value of pAge when the output is an address? Don't get it..
instead of pAge you give *pAge
then you get value
this video was quite difficult to understand
apres du txa es
Jesus it looks so confusing and pointless :D.
thanks bro