James wrote:
>
> Ok, i understand the need to make a pointer to the pointer so you can
> make the pointer point to some other pointer (ok, so i intentionally
> put lots of pointers in that line :) ) but here's what i'm trying to do:
>
Be careful on using pointers in C , it can take you hours to find a
little bug. So keep it simple.
try the next code.
typedef struct line_t line;
struct line_t {
char data[80];
line *next;
};
/* -- Start of actual source --*/
#include <stdio.h>
#include <string.h>
void next_1 (line *in);
void next_1 (line *in)
{
/* this is where i am having difficulties, gcc gives this error:
passback.c:9: request for member `next' in something not a
structure
or union */
in = in->next;
/* printf to test the pointer access */
printf (" %s\n",in->data);
}
void main (void)
{
line *listy;
listy = (line *) malloc (sizeof (line));
strcpy (listy->data, "Hello");
listy->next = (line *) malloc (sizeof (line));
strcpy (listy->next->data, "Out There");
listy->next->next = NULL;
printf (%s",listy->data);
next_1 (listy);
}
>
> anybody recommend a good Linux/unix C book? one that covers linux/unix related
> things like processes etc. I DO have the Linux programming man reference
> pages, however if you don't know the name of the function you're after, it's
> a bit hard to find what you need :) (some sort of contents page would have
> been useful)
As i am novice to Linux i use 'Beginning Linux Programming' from Wrox
Press
ISBN 1-874416-68-0. This book expect you to have some
experience on programming C, but i gives you a good
start for learning basic techniques for programming in
a Linux environment.
Other good titles are welcome.
Regards, Henk Jan
