Why understanding pointers and structures are hard in C language

Answer 1

Zoetic_Zeel
Let me take an easy example to understand pointers.
First of all, pointers are mainly used to pass value by reference.
Now what does this mean?
I hope you know how to pass by value:
int add(int c, int d) {
return (c+d);
}
int main() {
int a,b;
scanf("%d%d",&a&b);
printf("%d",add(a,b));
}
Here you can see, variables a and b inside the main() are its local variables and variables c and d in the parameters of add() are local to add().
This means any change in value of c and d will not change values of a and b and therefore return is used.
Now, how about we skip return statement such that changes made in add() reflect changes in a and b inside main() ? This is where pointers comes into picture.
Here's how:
int add(int *c, int d) {
*c=*c+d;
}
int main() {
int a,b;
scanf("%d%d",&a&b);
add(&a,b);
// only a is passed by reference

printf("%d",a);
}
What happened here? Lets see->
We passed the address of variable (a) instead of passing its value using '&' operator.
(1/2)

Answer 2

Harsh Singh

What do you find difficult exactly.

Please add descriptions to your questions in the future.

Answer 3

just go ahead with basics of basic...... & just try to make 6-7 programs daily based on pointer & structure..... than... believe me...... u can't feel definitely at all

Answer 4

Sherlock 聂... So.... what's the better material?.... if u have... so drop the link here

Answer 5

Sherlock 聂 thanks dear

Answer 6

Zoetic_Zeel
To be honest, I need to look into this myself as I don't know much about this right now. As of now, I can say it seems to me like any other pointer variable...
https://www.geeksforgeeks.org/whats-difference-between-char-s-and-char-s-in-c/amp/

https://code.sololearn.com/cEN7NaaeHx1g/?ref=app

Answer 7

Things seem hard until you understand them
Yes! Its hard, no doubt.
All you need is a right tutorial.

Answer 8

(cont)
Variable c is a pointer to variable a and contains its address and with '*' operator, we can access the value contained by the variable to which it points.
Any changes made to c variable will reflect a change of value in a var.
Therefore, when we write *c=*c+d, it actually is a=a+d (just for the sake of understanding)
Without using return, we stored the sum in var a and then printed it (though you will loose the original value of a in this case, but this is just an example. If you wish you can use a temporary variable)
Interestingly, we can change as many values as we want using pointers instead of only one value as in case of return.
Hope this helps :)
(2/2)

Answer 9

Didn't understand that topic....
Yes'll add descriptions in future questions.

Answer 10

no. practice are make strong grip for structure ...... statement

Answer 11

please complete your question.
where do you find problem.

Answer 12

Infinity Oh, that was a great explanation. thank you very much.

I see somewhere they use directly char* to declare string array or a string. is it similar thing as pointers or I'm missing something here...

Answer 13

yes,indeed.

Answer 14

Manual Infinity What is the scope of a pointer? and why exactly we need pointers.. Can anyone give an comparative example, where one can show that using pointers is better approach here..

Answer 15

This is not much,but can help to understand the basics of pointer.
https://code.sololearn.com/coqySKO29c94/?ref=app

Answer 16

I can't understand that question