Problem with pointers, require some help

[david]

Hello, I am getting some problems with C and how it handles the
pointers. I will tell more about the situation: I have created my own
structure for making one way linked list. I have procedure int
createList(child *root) [child is that structure] and before that I
create pointer child *rootA, and then I invoke createList(rootA)
[*rootA holds the value, and rootA is the pointer, holds the address
as I remember]. And this function creates dynamic list, but the
problem is that rootA does not point to it. After creating list
function returns the length of it.

The question is, how should I send to function a pointer, create a
list in heap and then make that pointer to point to it?

It would be something like this:
int main {
int *item;
func(*item);
printf("%d", *item);
return 0;
}

func(int *num) {
num = malloc(sizeof(int));
*num = 8;
printf("%d", *num);
printf in func gives "8", but item still does not point to the same
memory where that number is located. But I want it to point. How?
}

[david]

Small mistaking rewriting, should be "func(item);" in program. Any
ideas how to make it point to what I want?

[fnegroni]

Use a pointer to pointer.

You can read about it in any C programming manual.

[david]

Thanks for the help, I used pointer to pointer as a few people
suggested.

It is my first day with C programming language and I still collecting
books, websites and etc. with the most detailed explanation how
everything here works. Maybe you could recommend some good material?

And for ASM looks a lot easier comparing to C, but it looks that in a
week I will manage to write some good or at least better code than I
do now.

Thanks again.

[Default User]

david wrote:

Thanks for the help, I used pointer to pointer as a few people
suggested.

It is my first day with C programming language and I still collecting
books, websites and etc. with the most detailed explanation how
everything here works. Maybe you could recommend some good material?

Then this is not how you should approach learning. Get a basic tutorial
book. Read through it, working the exercises in each chapter. Then
start creating simple programs.

Brian

[Richard Bos]

CBFalconer <cb********@yahoo.comwrote:

david wrote:

Small mistaking rewriting, should be "func(item);" in program. Any
ideas how to make it point to what I want?

See sig below.

--
Posted via a free Usenet account from http://www.teranews.com

What's so interesting about that?

Richard

[Flash Gordon]

santosh wrote, On 05/02/08 19:54:

david wrote:

>Thanks for the help, I used pointer to pointer as a few people
suggested.

It is my first day with C programming language and I still collecting
books, websites and etc. with the most detailed explanation how
everything here works. Maybe you could recommend some good material?

The C Programming Language (Second Edition) by Kernighan & Ritchie

<snip good suggestions>

Also the comp.lang.c FAQ which would have answered the OPs question. If
can be found at http://c-faq.com/
--
Flash Gordon