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Re: Application Exercises

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Tim Rentsch <tr.17687@z991.linuxsc.com> wrote:
> mark.bluemel@gmail.com writes:
> 
>> On Sunday, 7 April 2019 07:55:40 UTC+1, Tim Rentsch  wrote:
>>
>>> ram@zedat.fu-berlin.de (Stefan Ram) writes:
>>>
>>>> |Write a function to detect whether two integral numbers are
>>>> |equal without using any comparison operators.
>>>
>>> I have written a solution that I believe works correctly
>>> on any conforming implementation.
>>
>> But it's too large to fit in this margin?
> 
> Actually I wrote several solutions.  But I wasn't really
> happy with any of them, they were all a bit clunky in one
> way or another.  The point of my comment is just to say
> a fully portable solution is possible.

Didn't anybody just write...

/* --- test whether or not two ints are equal,
   without comparisons --- */
#include <stdio.h>
#include <stdlib.h>
int main ( int argc, char *argv[] ) {
  int  i = (argc>1? atoi(argv[1]) : 1 ),
       j = (argc>2? atoi(argv[2]) : 2 );
  int  isequal();
  fprintf( stdout," %d %s %d? \n",
       i, (isequal(i,j)?"==":"=/="), j);
  } /* --- end-of-function main() --- */

int isequal ( int i, int j ) {
  return ( !( abs(i-j) ) );
  } /* --- end-of-function isequal() --- */

Works fine on my box.
-- 
John Forkosh  ( mailto:  j@f.com  where j=john and f=forkosh )

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Re: Application Exercises Tim Rentsch <tr.17687@z991.linuxsc.com> - 2019-04-06 23:55 -0700
  Re: Application Exercises mark.bluemel@gmail.com - 2019-04-08 00:33 -0700
    Re: Application Exercises Tim Rentsch <tr.17687@z991.linuxsc.com> - 2019-04-09 04:28 -0700
      Re: Application Exercises John Forkosh <forkosh@panix.com> - 2019-04-11 13:07 +0000
        Re: Application Exercises Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2019-04-11 06:11 -0700
          Re: Application Exercises John Forkosh <forkosh@panix.com> - 2019-04-11 13:19 +0000
            Re: Application Exercises James Kuyper <jameskuyper@alumni.caltech.edu> - 2019-04-11 06:49 -0700
              Re: Application Exercises Ben Bacarisse <ben.usenet@bsb.me.uk> - 2019-04-12 01:20 +0100
      Re: Application Exercises Richard Damon <Richard@Damon-Family.org> - 2019-04-11 23:36 -0400
        Re: Application Exercises Tim Rentsch <tr.17687@z991.linuxsc.com> - 2019-04-12 19:08 -0700

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