[Phptest-users] correct responses marked wrong on certain questions

[cfischer5]

Very occasionally, I write questions where the program has problems 
matching the correct answer with the user's correct choice. I know that 
there are problems if one of the answers is 0 (zero) so I usually write 
zero rather than 0. And I am careful to use &lt; for < though the 
program always changes it.  Here is a question that is graded 
incorrectly (html copied from the answer page). Can you see anything in 
it that would cause this?

<td width="100%" class="even"><b>Question #: 30: </b>What can be 
determined about the contents of the list array?
<pre><b>   
       import java.util.Random;

       public class Java1318
       {
           public static void main(String args[])
           {
               int list[] = {0,1,2,3,4,5,6,7,8,9};
               Random r = new Random();
               for (int k = 0; k < list.length ; k++)
                   list[r.nextInt(10)] = k;
               System.out.println();
           }
       }
</b></pre>
<br />
<b>User's answer: </b><span class="incorrect">The original list array 
contains {0,1,2,3,4,5,6,7,8,9} and then random elements of the list 
array are    changed to the current value of k.</span><br />
<b>Correct answer: </b>The original list array contains 
{0,1,2,3,4,5,6,7,8,9} and then random elements of the list array are    
changed to the current value of k.
<br />
<b>Additional Notes: </b><br /><br />
</td>

</tr>
</table>
<table width="90%" cellspacing="3" cellpadding="8">
<tr>

Thanks!
Charlotte Fischer

PS: A great program! I have used it for several years (upgraded to 6.3) 
and have made a few modifications, such as being able to set the view 
date, and adding a fifth question choice. I have a database of about 
1700 questions (with some repeats since I reuse questions on different 
tests).