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HTTP/2 302 server: nginx date: Fri, 08 Aug 2025 00:56:30 GMT content-type: text/plain; charset=utf-8 content-length: 0 x-archive-redirect-reason: found capture at 20091107112128 location: https://web.archive.org/web/20091107112128/https://gist.github.com/221929 server-timing: captures_list;dur=0.495033, exclusion.robots;dur=0.019506, exclusion.robots.policy;dur=0.009635, esindex;dur=0.009876, cdx.remote;dur=7.523593, LoadShardBlock;dur=177.184235, PetaboxLoader3.datanode;dur=70.663648 x-app-server: wwwb-app218 x-ts: 302 x-tr: 215 server-timing: TR;dur=0,Tw;dur=0,Tc;dur=0 set-cookie: wb-p-SERVER=wwwb-app218; path=/ x-location: All x-rl: 0 x-na: 0 x-page-cache: MISS server-timing: MISS x-nid: DigitalOcean referrer-policy: no-referrer-when-downgrade permissions-policy: interest-cohort=() HTTP/2 200 server: nginx date: Fri, 08 Aug 2025 00:56:30 GMT content-type: text/html; charset=utf-8 x-archive-orig-server: nginx/0.7.61 x-archive-orig-date: Sat, 07 Nov 2009 11:21:28 GMT x-archive-orig-connection: close x-archive-orig-status: 200 OK x-archive-orig-etag: "6f0d165744746fd62df054ba555aafdc" x-archive-orig-x-runtime: 386ms x-archive-orig-content-length: 15288 x-archive-orig-cache-control: private, max-age=0, must-revalidate x-archive-guessed-content-type: text/html x-archive-guessed-charset: utf-8 memento-datetime: Sat, 07 Nov 2009 11:21:28 GMT link: ; rel="original", ; rel="timemap"; type="application/link-format", ; rel="timegate", ; rel="first memento"; datetime="Sat, 07 Nov 2009 11:21:28 GMT", ; rel="memento"; datetime="Sat, 07 Nov 2009 11:21:28 GMT", ; rel="next memento"; datetime="Wed, 09 Dec 2009 06:05:58 GMT", ; rel="last memento"; datetime="Wed, 09 Dec 2009 06:05:58 GMT" content-security-policy: default-src 'self' 'unsafe-eval' 'unsafe-inline' data: blob: archive.org web.archive.org web-static.archive.org wayback-api.archive.org athena.archive.org analytics.archive.org pragma.archivelab.org wwwb-events.archive.org x-archive-src: 51_12_20091107040209_crawl100_IndexOnly-c/51_12_20091107112032_crawl101.arc.gz server-timing: captures_list;dur=0.656577, exclusion.robots;dur=0.023514, exclusion.robots.policy;dur=0.010552, esindex;dur=0.011709, cdx.remote;dur=9.000016, LoadShardBlock;dur=274.928352, PetaboxLoader3.resolve;dur=195.682917, PetaboxLoader3.datanode;dur=186.850628, load_resource;dur=155.397857 x-app-server: wwwb-app218 x-ts: 200 x-tr: 492 server-timing: TR;dur=0,Tw;dur=0,Tc;dur=1 x-location: All x-rl: 0 x-na: 0 x-page-cache: MISS server-timing: MISS x-nid: DigitalOcean referrer-policy: no-referrer-when-downgrade permissions-policy: interest-cohort=() content-encoding: gzip gist: 221929 - GitHub

KirinDave (owner)

Revisions

a7193f KirinDave Thu Oct 29 16:14:02 -0700 2009
c2727f KirinDave Thu Oct 29 16:13:34 -0700 2009

gist: 221929

Public Clone URL:

git://gist.github.com/221929.git

Give this clone URL to anyone.
git clone git://gist.github.com/221929.git gist-221929

example.c

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raw

#include <stdio.h>
 
/*******************************************************
 *                 SAMPLE COMPILATION AND OUTPUT
 *
 * % gcc -o overflow_example example.c ; ./overflow_example
 * I just overflowed, I am now negative!
 * Current Value is: -32768
 * Last Value is: 32767I have looped back upon myself to 0! 
 *
 *******************************************************/
 
int main(int argc, char *argv[]) {
  short current = 1, last = 0; // Values which are 2 bytes long and range from -32768 to 32767
                               // (including 0), or "16-bit signed integers". 
  while(current != 0) {
    current = current + 1;
    if(current < last) {
      // Current is less than last, but if we're adding how can that possibly happen?!
      // In a word... "Signed Overflow"
      printf("I just overflowed, I am now negative!\nCurrent Value is: %d\nLast Value is: %d\n", 
             current, 
             last);
    }
    last = current;
  }
  printf("I have looped back upon myself to 0!\n");
  return 0;
}

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