l i n u x - u s e r s - g r o u p - o f - d a v i s
Next Meeting:
July 7: Social gathering
Next Installfest:
Latest News:
Jun. 14: June LUGOD meeting cancelled
Page last updated:
2010 Apr 20 18:54

The following is an archive of a post made to our 'vox-tech mailing list' by one of its subscribers.

Report this post as spam:

(Enter your email address)
[vox-tech] loop never exits!
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[vox-tech] loop never exits!

Our new guy (forget his name, doh!) and I figured out the problem with
my loop that would count down, but not terminate. Turns out I was using
an unsigned integer for my counter in my for loop and it is always
greater than zero (Example 1).

Funny thing is that -Wall didn't catch this. Seems that -Wall could
catch this assuming that we want to loop to terminate. Any thoughts?

Say the compiler gave a warning, would that mess up the "for (;;)"
construct shown in Example 2?


// Example 1
// Loop never terminates
#include <stdio.h>

int main() {
  unsigned int i, num=50;

  for (i= num ; i >= 0; i--) {

  return 0;

// Example 2
// Purposely never terminates
#include <stdio.h>

int main() {
  for (;;) {
    printf("Hello forever\n");
   return 0;
Brian Lavender

"For every complex problem there is an answer that is clear, simple, and wrong."
- H. L. Mencken 
vox-tech mailing list

LUGOD Group on LinkedIn
Sign up for LUGOD event announcements
Your email address:
LUGOD Group on Facebook
'Like' LUGOD on Facebook:

Hosting provided by:
Sunset Systems
Sunset Systems offers preconfigured Linux systems, remote system administration and custom software development.

LUGOD: Linux Users' Group of Davis
PO Box 2082, Davis, CA 95617
Contact Us

LUGOD is a 501(c)7 non-profit organization
based in Davis, California
and serving the Sacramento area.
"Linux" is a trademark of Linus Torvalds.

Sponsored in part by:
Appahost Applications
For a significant contribution towards our projector, and a generous donation to allow us to continue meeting at the Davis Library.