Ok. figured it out. whileTrue: only evaluates at the end of each block so it didn&#39;t evaluate.<div>I guess ignorance is not bliss, after all.�<br><br><div class="gmail_quote">On Sun, Jan 8, 2012 at 10:05 AM, Larry White <span dir="ltr">&lt;<a href="mailto:ljw1001@gmail.com">ljw1001@gmail.com</a>&gt;</span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">I&#39;m messing about with Project Euler problems and have noticed some behavior that I don&#39;t understand. �This one happens to be very self-contained so I though I&#39;d as for assistance.<div>
<br></div><div>This code (which doesn&#39;t solve the problem, btw) is buggy, but I can&#39;t see the bug and I&#39;m beginning to suspect something in the VM or the class libraries. When I execute it, two odd things happen:</div>

<div><br></div><div>First, in spite of the block test [sum &lt; 100] whileTrue:[...] �it continues to run when sum &gt; 100 (or a million for that matter). �</div><div><br></div><div>Second, the block in the line:</div><div>

<span style="white-space:pre-wrap">	</span>(sum isPrime)�ifTrue: [�(seq size &gt; bestSeq size) ifTrue: [ bestSeq := seq copy.]]</div><div>executes even when sum is not a prime number.</div><div><br></div>
<div>Any help is appreciated.�</div><div>-------------------------------</div><div>&quot;Create a list of primes smaller than a million&quot;</div><div><div>primes := OrderedCollection new.</div><div>2 to: 999999 do: [ :n | n isPrime ifTrue: [ primes add: n]].</div>

<div><br></div><div>bestSeq := OrderedCollection new.</div><div>seq := OrderedCollection new.</div><div>sum := 0.</div><div>[sum &lt; 100] whileTrue: [</div><div><span style="white-space:pre-wrap">	</span>primes do: [:prime |�</div>

<div><span style="white-space:pre-wrap">		</span>seq add: prime.</div><div><span style="white-space:pre-wrap">		</span>sum := seq sum.</div><div><span style="white-space:pre-wrap">		</span>(sum isPrime)�ifTrue: [�(seq size &gt; bestSeq size) ifTrue: [ bestSeq := seq copy.]]</div>

<div><span style="white-space:pre-wrap">		</span>]</div><div><span style="white-space:pre-wrap">	</span>].</div></div>
</blockquote></div><br></div>