Pointers (Important Questions)
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- čas přidán 4. 09. 2024
- C Programming: Pointer's important problems.
Topic discussed:
1) Set of important questions based on the basics of pointers.
C Programming Lectures: goo.gl/7Eh2SS
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can't express my thanks through words.i am a beginner in the programming field and u r guiding me to a strong base. u r a gem sir.lots of love and respect for helping ordinary students like me.
special thanks to the last question. It cleared my very basic doubt of pointer.
of course
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I actually never saw anyone able to explain pointers that well and I´ve been trying to understand pointers via CZcams for two days !
Ty man !
Many beginners like myself, struggle with pointers, when the star symbol have different meanings.
After a while I differentiate between making a pointers or the contents of pointers.
It helps to have a good understanding hexadecimals and their relations to bytes and bits.
And lastly use a debugger and single step through the code while monitoring the related memory.
THANKS A LOT!!! I am facing difficulties in the whole topic of pointers but now I have gained more refined concepts because of your such simple and great explanation. GOD BLESS YOU!
I loved the way you explain every topic.Now I realize ,I haven't learned well in 1st yr .I wish I could found your videos in 1st yr anyways now I follow ur channel n I got to learn new things.thanks to you.keep up doing this.
i just want to add this this is an incredibly helpful video. you have my infinite thanks for making this amazing series!
Tq for ur fantastic explanation sir. Before seeing this video I confused about pointers.
But after your fantastic explanation I understood clearly especially with the last example of the video
In the first question you have explained that we cannot write int *p = &i; but in the third question where we are printing the address of pointer, you have used the same thung
Finally difference between pointers and indifference operators is get cleared in QNA session, thank you🙌
Thank you very much Neso Academy.I have learned a lot of important things that miss by my eyes.
I believe a small point needs to be raised for part (d) of question 4.
You have made the assumption that the variable i is an integer, although this was never mention in the question. If the value stored in i was a hexadecimal value which could correspond to an address in memory wouldn't *i be a valid expression? And if this value corresponded to the address of i, then *i would evaluate to itself, therefore would be a valid alias.
Therefore the answer to part (d) needs to be, if i does not hold a hexadecimal value of its own address, then it's not an alias for i. We need more information to confirm if it is an alias.
but it is mentioned that i is a variable and p is a pointer. even if i stores a hexadecimal value it doesn't mean that it's an address. *i will point to a different value stored at position pointed by the value of i which won't be equal to i.
The most understandable video about basis of pointers I've ever seen. Thank you so much
Oh wow! A lot of things about the nature of pointers just made A LOT of sense with these questions!
in question 3 you print the address of a pointer because you wrote 'p' in printf function.
for print the address of a variable we write *p or 'i' in printf function insteed of p.......
if i am wrong please comment down.....and i am right give a thumbsup👍
Wow! This tutorial just so helpful for me to understand more about pointer. Thanks a lot!
Best Chanel for c,pro💯💯💯✔️
But sir in previous video you tell
Int x=5,*ptr=&x
Waited for that first question!!
Very helpful thank you
Really Nice explaination...please come with more such C series
God gifted lectures🔥🔥
You are God, what a level of explanation , and in depth.
Pointers is one of the difficult topics in programming, but after watching this vid, I got to use pointers, thanks
Q2. but still constant is changeable!
#include
int fun(int *p){ //didn’t use const
*p = 10;
}
int main(){
const int x= 8;
fun(&x);
printf("%d ",x);
}
//output 10
Type casting from const to non-const? Confusing C.
Your series of c programming is very helpful.Thanks for making such videos.
Came from CS50. Personally, I WAY prefer your explanation over theirs. Wonderful job. Thank you for the knowledge
I had the first question exactly. Thank you so much. These tutos are so satisfying.
Thank you sir❤
i am very confused about pointer,especially the first question.And you save my life!!! Thank you
the first question really solved one of my long time questions, context !!. Thanks boys
You are the best,actually excellent 😎
This video was so helpful! thank you!
Man u deserve a million 💪!
Nice questions about the pointer
You’re the best instructor on YT I’ve seen so far ❤
Thanks for this great knowledgeable information
Please explain near pointer, far pointer and huge pointer in C language
Thank you
This is a great video. Thank you. 🙏🏽
This is awesome ❣️💕💕
very well stuff .....pls come with more C content & c++
Thanks is not at all enough for u sir it helped me a lot thanks sir
Absolutely awesome job Sir. Thank you... All cleared
wow thanks gave me a lot of clarity regarding pointers.
good educational content .
unique teaching method !
excellent explanation
Well explained...I loved it.....
Thanks
Thank you so much.. 😍
thank you very much! this is so brilliant.
For question number 1, it'll be easier to answer if we had a habit of adding the * to the datatype rather than the variable names. For ex: int* p instead of int *p.
Or int* fun() instead of int *fun(). Int *p just adds to more confusion for no real reason. The compiler is going to compile both expressions the same way. Writing it as int *p when the same thing when reading out loud is "pointer to int-p" is just plain stupid. One of the reasons why pointers is very confusing for beginners.
Very good point!
Thank you sir
Nice explanation
when you use %p to see address of variable you wıll see the result whıch ıs hexadecımal,to see decımal you should %d as usual.
thankuuuu
@@alvinaug3844 np
Thank you brother...Love from BD
Tq so much sir 🙏🏻🙏🏻🙏🏻
Tq Bro,U helped a lot,Pls Try to make more questions on this concept
assignment of read-only location '*p'
Awesome set of videos. from Neso..
Simply Awesome ❤
In question 2:
If we remove const to *p.
Then it is generating o/p 0.
But i variable is also const , then why it is getting o/p.
Now pointers are cakewalk
in q3 int *p=&i is correct or not,because in first question we learn that *p is integer pointer variable which cant hold the address value
It is correct... Because it indicates to the compiler that p is not a simple variable rather than it's a pointer which points to a integer type data... But after declaring a pointer, if we again put a * in front of it this will indicate to the value Stored in the particular address which is stored in the pointer, ie, it will indicate to the integer not to the address of it
What's the difference if we use the %u to print address rather than %p?
%u- unsigned integer type
%p- unsigned hexa decimal type
@@sid8130
Thanks a lot,🙇🙇
Thank u very much
Great teacher ^^!
We would also have segmentation fault ?
int num = 69;
printf("%d
",&num);
int *ptr = #
*ptr = #
printf("%d",num);
this definitely works,
hence last 2 statements at 2:51 are wrong!!!!!
Awesome explanation 👍
love you sir
thasnk you
What will happen if we write **&p? Is it allowed to write so?
Doesnot give sense
Yes you can write ,it gives value of
i
There is a slight mistake or idk what that is! *&p and &*p always prints the address of I. According to normal logic , *&p should print the garbage inside p and &*p should print the address of p! Then why it always prints the address of the pointer "p"?
I love your classes by the way sir !
😁
I think it has something to do with precedence and I think & has the higher precedence maybe. Please correct me if I'm wrong.
question 4 was amazing.
Here the address is of which data type? It includes integer as well as character!
thanks man
Thank you neso
Evening Sir
But what will happen if i = 3000
And I want *i. ???Then will it give a value located a address 3000??
Creative Minds nope u cant directly do this because i is a not pointer but u can give a constant memory adress by your own by doing
İnt *p;
P= 3000;
Now p points the memory adress 3000
Thank u
Wow. You rocks. 🤟🤟🤟🤟
Keep going bro, you're a legend
2:41
41:21
Nice video
No the question also is why isn't the second statement declared
Bro one thing you told was wrong
We can modify const int value either by pointer or scanf function.
www.onlinegdb.com/online_c_compiler he is correct man, stop misguiding people p.s. you can change it but you have to use non constant pointer to do this.
9:58
Where is your data structur lectures???can't find it??
Sir then what is the significance of the number that is coming in output?
#include
int main()
{
int i = 10;
int *p = &i;
printf("%d", p);
return 0;
}
error: assignment of read-only location ‘*p’
slides of this course is available ?
int i =10;
int *p = &i;
printf("%p", p) // Instead of this can't I directly do printf("%d", &p); ?
No, because it is considered to be illegal accessing the content of a pointer variable
Sorry , it will print the address
It shows some garbage value
i am getting too much error while writing same same code that you shown .
🔥🔥🔥🔥
Why does the address of a variable keep changing?
its never the same value,its a random addres of memory everytime you compile it
I didnt get e part of ques 3 right
hence last 2 statements at 2:51 are wrong!!!!!