Re: value computed is not used ??

[Glynn Clements <glynn.clements@virgin.net>]

J. wrote:

> When I try to compile the listed program, with gcc version 2.95.4 20011002
> and the command `gcc -Wall program.c -o program` It gives me a warning
> message like: warning: value computed is not used
> 
> The program works perfectly fine, as far as I can judge the code isn't
> wrong in any way ? And the value is certainly used.. Unfortunatly this
> message shows to many times when I try to compile other code at my system.
> 
> Can anyone explain to me what the sense behind that warning is ? And what
> to do about it ? e.g. what the ``better way`` of coding would be?
> 
> #include <stdio.h>
> 
> int main(void) {
>  char *ptr = NULL;
>  char str[] = "whats up";
> 
>  for(ptr = str; *ptr; *ptr++) {

	for(ptr = str; *ptr; ptr++) {

There is no point in dereferencing "ptr++", which is why you get the
warning.

-- 
Glynn Clements <glynn.clements@virgin.net>