File: cc65101209.c

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/*
  !!DESCRIPTION!! mod operator bug
  !!ORIGIN!!      testsuite
  !!LICENCE!!     Public Domain
  !!AUTHOR!!      marcas
*/

#include <stdlib.h>
#include <stdio.h>

int main(void) {
     int tmp;

     for (tmp = 0; tmp<=12345; tmp++)
         if (!(tmp%1000)) printf("%d mod 1000 is %d\n", tmp, tmp%1000);

    return 0;
}

/*
results in  (vice x64)
0 mod 1000 is 0
232 mod 1000 is 0
1000 mod 1000 is 0

Interesting:

        1000    = $3E8
        232     = $E8

So testing with 999 gives:

0 mod 999 is 0
231 mod 999 is 0
999 mod 999 is 0

This seems to be systematic. 
*/