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

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Re: [vox-tech] detecting overflows
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Re: [vox-tech] detecting overflows



On Mon, 12 Mar 2001 jdnewmil@dcn.davis.ca.us wrote:

> IEEE 754 includes provisions for overflow notification through NaNs or
> flags, but most implementations seem to support these features poorly.

Err... shouldn't you get infinity if you overflow?:

  #include <stdio.h>

  int main() {
     double d = 1e12;
     int i;

     for(i = 0; i < 20; i++) {
        printf("%lf\n", d);
        d *= d;
     }

     return 0;
  }

Output:

   1000000000000.000000
   999999999999999983222784.000000
   1000000000000000043845843045076197354634047651840.000000
   
1000000000000000049861653971908893017010268485438462151574892930611988399099305815384459015356416.000000
   
1000000000000000040900880208761398001286019738266296957960021713442094663491997727554362004538245197373563261847757813447631532786297905940174312186739777303375354598782943738754654264509857792.000000
   inf
   inf
   inf
   ...

Yep... unless this is a broken behavior...

-Mark

---
Mark K. Kim
http://www.cbreak.org/mark/
PGP key available upon request.


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