<br> Hi Joe,<br><br> It seems someone skipped the elementary math lessons at school... :(<br><br> Will open a JIRA for that.<br><br> []s<br> Edson<br><br><div class="gmail_quote">2008/4/9 Joe White <<a href="mailto:Joe.White@recondotech.com">Joe.White@recondotech.com</a>>:<br>
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<p style="">I have a question regarding
order of operations in the consequence of a rule when using the mvel dialect.
When executed the Drl below provides <span style="font-size: 10pt; color: black;">Right =30.0</span><span style="font-size: 10pt;"> and <span style="color: black;">Wrong =140.0. The
only difference is the parens around the multiplying expressions, which shouldn't
be necessary given order of operations. Is this a problem with the drools/mvel
interaction or is it completely an issue with mvel? </span></span></p>
<p style=""><span style="font-size: 10pt; color: black;"> </span></p>
<p style=""><span style="font-size: 10pt; color: black;">Is the general expectation that all
expressions must be completely scoped by parens when using mvel? </span></p>
<p> </p>
<p style=""><b><span style="font-size: 10pt; color: rgb(150, 0, 0);">package</span></b><span style="font-size: 10pt; color: black;"> test;</span><span style="font-size: 10pt;"></span></p>
<p style=""><b><span style="font-size: 10pt; color: rgb(150, 0, 0);">dialect</span></b><span style="font-size: 10pt; color: black;"> </span><span style="font-size: 10pt; color: green;">"mvel"</span><span style="font-size: 10pt;"></span></p>
<p style=""><b><span style="font-size: 10pt; color: rgb(150, 0, 0);">rule</span></b><span style="font-size: 10pt; color: black;"> </span><span style="font-size: 10pt; color: green;">"test 11"</span><span style="font-size: 10pt;"></span></p>
<p style=""><span style="font-size: 10pt; color: black;"> </span><b><span style="font-size: 10pt; color: rgb(150, 0, 0);">when</span></b><span style="font-size: 10pt;"></span></p>
<p style=""><span style="font-size: 10pt;"> </span></p>
<p style=""><span style="font-size: 10pt; color: black;"> </span><b><span style="font-size: 10pt; color: rgb(150, 0, 0);">then</span></b><span style="font-size: 10pt;"></span></p>
<p style=""><span style="font-size: 10pt; color: black;">
</span><b><span style="font-size: 10pt; color: rgb(150, 0, 0);">double</span></b><span style="font-size: 10pt; color: black;">
rightVal=((10-5)*2) + (5*(8-4));</span><span style="font-size: 10pt;"></span></p>
<p style=""><span style="font-size: 10pt; color: black;">
</span><b><span style="font-size: 10pt; color: rgb(150, 0, 0);">double</span></b><span style="font-size: 10pt; color: black;">
wrongVal=(10-5)*2 + 5*(8-4);</span><span style="font-size: 10pt;"></span></p>
<p style=""><span style="font-size: 10pt;"> </span></p>
<p style=""><span style="font-size: 10pt; color: black;"> System.out.println(</span><span style="font-size: 10pt; color: green;">"Right ="</span><span style="font-size: 10pt; color: black;">+rightVal);</span><span style="font-size: 10pt;"></span></p>
<p style=""><span style="font-size: 10pt; color: black;"> System.out.println(</span><span style="font-size: 10pt; color: green;">"Wrong ="</span><span style="font-size: 10pt; color: black;">+wrongVal);</span><span style="font-size: 10pt;"></span></p>
<p><b><span style="font-size: 10pt; color: rgb(150, 0, 0);">End</span></b></p>
<p><b><span style="font-size: 10pt; color: rgb(150, 0, 0);"> </span></b></p>
<p><b><span style="font-size: 10pt; color: rgb(150, 0, 0);">After execution:</span></b></p>
<p><span style="font-size: 10pt; color: black;">Right =30.0</span><span style="font-size: 10pt;">
</span></p>
<p><span style="font-size: 10pt; color: black;">Wrong =140.0</span></p>
<p><span style="font-size: 10pt; color: black;"> </span></p>
<p><span style="font-size: 10pt; color: black;"> </span></p>
<p><span style="font-size: 10pt; color: black;">Thank you for all of your help. We are using drools <a href="http://4.0.4." target="_blank">4.0.4.</a></span></p>
<p><span style="font-size: 10pt; color: black;"> </span></p>
<p><span style="font-size: 10pt; color: black;">Joe</span></p>
<p><span style="font-size: 10pt; color: black;"> </span></p>
<p style=""><span style="font-size: 10pt; color: black;">Also, I haven't figured out how it
arrives at 140. The following format also produces 140, which seems a little
more strange.</span></p>
<p style=""><span style="font-size: 10pt;"> <b>double</b>
wrongVal=10-5*2 + 5*8-4;</span></p>
<p style=""><span style="font-size: 10pt;"> </span></p>
<p style=""><span style="font-size: 10pt;"> </span></p>
<p> </p>
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<br></blockquote></div><br><br clear="all"><br>-- <br> Edson Tirelli<br> JBoss Drools Core Development<br> Office: +55 11 3529-6000<br> Mobile: +55 11 9287-5646<br> JBoss, a division of Red Hat @ <a href="http://www.jboss.com">www.jboss.com</a>