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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Anyone else use Please Excuse My Dear Aunt
Sally? (Parentheses, Exponentiation, Multiplication, Division, Addition,
Subtraction)<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
rules-users-bounces@lists.jboss.org
[mailto:rules-users-bounces@lists.jboss.org] <b><span style='font-weight:bold'>On
Behalf Of </span></b>Edson Tirelli<br>
<b><span style='font-weight:bold'>Sent:</span></b> Wednesday, April 09, 2008
2:39 PM<br>
<b><span style='font-weight:bold'>To:</span></b> Rules Users List<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [rules-users] Order
of operations</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'><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<o:p></o:p></span></font></p>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>2008/4/9 Joe White <<a href="mailto:Joe.White@recondotech.com">Joe.White@recondotech.com</a>>:<o:p></o:p></span></font></p>
<div link=blue vlink=purple>
<div>
<p><font size=3 face="Times New Roman"><span style='font-size:12.0pt'>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></font><font
size=2 color=black><span style='font-size:10.0pt;color:black'>Right =30.0</span></font><font
size=2><span style='font-size:10.0pt'> and <font color=black><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></font></span></font><o:p></o:p></p>
<p><font size=2 color=black face="Times New Roman"><span style='font-size:10.0pt;
color:black'> </span></font><o:p></o:p></p>
<p><font size=2 color=black face="Times New Roman"><span style='font-size:10.0pt;
color:black'>Is the general expectation that all expressions must be completely
scoped by parens when using mvel? </span></font><o:p></o:p></p>
<p><font size=3 face="Times New Roman"><span style='font-size:12.0pt'> <o:p></o:p></span></font></p>
<p><b><font size=2 color="#960000" face="Times New Roman"><span
style='font-size:10.0pt;color:#960000;font-weight:bold'>package</span></font></b><font
size=2 color=black><span style='font-size:10.0pt;color:black'> test;</span></font><o:p></o:p></p>
<p><b><font size=2 color="#960000" face="Times New Roman"><span
style='font-size:10.0pt;color:#960000;font-weight:bold'>dialect</span></font></b><font
size=2 color=black><span style='font-size:10.0pt;color:black'> </span></font><font
size=2 color=green><span style='font-size:10.0pt;color:green'>"mvel"</span></font><o:p></o:p></p>
<p><b><font size=2 color="#960000" face="Times New Roman"><span
style='font-size:10.0pt;color:#960000;font-weight:bold'>rule</span></font></b><font
size=2 color=black><span style='font-size:10.0pt;color:black'> </span></font><font
size=2 color=green><span style='font-size:10.0pt;color:green'>"test
11"</span></font><o:p></o:p></p>
<p><font size=2 color=black face="Times New Roman"><span style='font-size:10.0pt;
color:black'> </span></font><b><font size=2 color="#960000"><span
style='font-size:10.0pt;color:#960000;font-weight:bold'>when</span></font></b><o:p></o:p></p>
<p><font size=2 face="Times New Roman"><span style='font-size:10.0pt'> </span></font><o:p></o:p></p>
<p><font size=2 color=black face="Times New Roman"><span style='font-size:10.0pt;
color:black'> </span></font><b><font size=2 color="#960000"><span
style='font-size:10.0pt;color:#960000;font-weight:bold'>then</span></font></b><o:p></o:p></p>
<p><font size=2 color=black face="Times New Roman"><span style='font-size:10.0pt;
color:black'> </span></font><b><font
size=2 color="#960000"><span style='font-size:10.0pt;color:#960000;font-weight:
bold'>double</span></font></b><font size=2 color=black><span style='font-size:
10.0pt;color:black'> rightVal=((10-5)*2) + (5*(8-4));</span></font><o:p></o:p></p>
<p><font size=2 color=black face="Times New Roman"><span style='font-size:10.0pt;
color:black'> </span></font><b><font
size=2 color="#960000"><span style='font-size:10.0pt;color:#960000;font-weight:
bold'>double</span></font></b><font size=2 color=black><span style='font-size:
10.0pt;color:black'> wrongVal=(10-5)*2 + 5*(8-4);</span></font><o:p></o:p></p>
<p><font size=2 face="Times New Roman"><span style='font-size:10.0pt'> </span></font><o:p></o:p></p>
<p><font size=2 color=black face="Times New Roman"><span style='font-size:10.0pt;
color:black'> System.out.println(</span></font><font
size=2 color=green><span style='font-size:10.0pt;color:green'>"Right
="</span></font><font size=2 color=black><span style='font-size:10.0pt;
color:black'>+rightVal);</span></font><o:p></o:p></p>
<p><font size=2 color=black face="Times New Roman"><span style='font-size:10.0pt;
color:black'> System.out.println(</span></font><font
size=2 color=green><span style='font-size:10.0pt;color:green'>"Wrong
="</span></font><font size=2 color=black><span style='font-size:10.0pt;
color:black'>+wrongVal);</span></font><o:p></o:p></p>
<p><b><font size=2 color="#960000" face="Times New Roman"><span
style='font-size:10.0pt;color:#960000;font-weight:bold'>End</span></font></b><o:p></o:p></p>
<p><b><font size=2 color="#960000" face="Times New Roman"><span
style='font-size:10.0pt;color:#960000;font-weight:bold'> </span></font></b><o:p></o:p></p>
<p><b><font size=2 color="#960000" face="Times New Roman"><span
style='font-size:10.0pt;color:#960000;font-weight:bold'>After execution:</span></font></b><o:p></o:p></p>
<p><font size=2 color=black face="Times New Roman"><span style='font-size:10.0pt;
color:black'>Right =30.0</span></font><font size=2><span style='font-size:10.0pt'>
</span></font><o:p></o:p></p>
<p><font size=2 color=black face="Times New Roman"><span style='font-size:10.0pt;
color:black'>Wrong =140.0</span></font><o:p></o:p></p>
<p><font size=2 color=black face="Times New Roman"><span style='font-size:10.0pt;
color:black'> </span></font><o:p></o:p></p>
<p><font size=2 color=black face="Times New Roman"><span style='font-size:10.0pt;
color:black'> </span></font><o:p></o:p></p>
<p><font size=2 color=black face="Times New Roman"><span style='font-size:10.0pt;
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></font><o:p></o:p></p>
<p><font size=2 color=black face="Times New Roman"><span style='font-size:10.0pt;
color:black'> </span></font><o:p></o:p></p>
<p><font size=2 color=black face="Times New Roman"><span style='font-size:10.0pt;
color:black'>Joe</span></font><o:p></o:p></p>
<p><font size=2 color=black face="Times New Roman"><span style='font-size:10.0pt;
color:black'> </span></font><o:p></o:p></p>
<p><font size=2 color=black face="Times New Roman"><span style='font-size:10.0pt;
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></font><o:p></o:p></p>
<p><font size=2 face="Times New Roman"><span style='font-size:10.0pt'>
<b><span style='font-weight:bold'>double</span></b> wrongVal=10-5*2 + 5*8-4;</span></font><o:p></o:p></p>
<p><font size=2 face="Times New Roman"><span style='font-size:10.0pt'> </span></font><o:p></o:p></p>
<p><font size=2 face="Times New Roman"><span style='font-size:10.0pt'> </span></font><o:p></o:p></p>
<p><font size=3 face="Times New Roman"><span style='font-size:12.0pt'> <o:p></o:p></span></font></p>
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<p class=MsoNormal style='margin-bottom:12.0pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'><br>
_______________________________________________<br>
rules-users mailing list<br>
<a href="mailto:rules-users@lists.jboss.org">rules-users@lists.jboss.org</a><br>
<a href="https://lists.jboss.org/mailman/listinfo/rules-users" target="_blank">https://lists.jboss.org/mailman/listinfo/rules-users</a><o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><br>
<br clear=all>
<br>
-- <br>
Edson Tirelli<br>
JBoss Drools Core Development<br>
Office: +55 11 3529-6000<br>
<st1:City w:st="on"><st1:place w:st="on">Mobile</st1:place></st1:City>: +55 11
9287-5646<br>
JBoss, a division of Red Hat @ <a href="http://www.jboss.com">www.jboss.com</a>
<o:p></o:p></span></font></p>
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