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2 total messages Started by alias Mon, 16 May 2005 15:33

[JAVA] - prioriteitsregels

#1315

Author: alias
Date: Mon, 16 May 2005 15:33

77 lines
3927 bytes

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Haakjes hebben toch de hoogste prioriteit.
Waarom krijg ik dan toch 2 verschillende resultaten=20
voor 'dezelfde' bewerking ? Blijkbaar wordt bij a)
de eerste term toch ge=EBvalueerd naar 10 ipv eerst de tweede
term tussen haakjes uit te werken.=20

  int x =3D 10;

  a)    x =3D x + (x =3D 3);    -> resultaat x =3D 13;

  b)    x =3D (x =3D 3) + x;    -> resultaat x =3D 6;

Iemand een antwoord ?=20

Bedankt !=20



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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<META http-equiv=3DContent-Type content=3D"text/html; =
charset=3Diso-8859-1">
<META content=3D"MSHTML 6.00.2800.1476" name=3DGENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY>
<DIV><FONT face=3DFixedsys size=3D1>Haakjes hebben toch de hoogste=20
prioriteit.</FONT></DIV>
<DIV><FONT face=3DFixedsys size=3D1>Waarom krijg ik dan toch 2 =
verschillende=20
</FONT><FONT face=3DFixedsys size=3D1>resultaten&nbsp;</FONT></DIV>
<DIV><FONT face=3DFixedsys size=3D1>voor 'dezelfde'&nbsp;bewerking ? =
Blijkbaar wordt=20
bij a)</FONT></DIV>
<DIV><FONT face=3DFixedsys size=3D1>de eerste term toch ge=EBvalueerd =
naar 10&nbsp;ipv=20
eerst&nbsp;de tweede</FONT></DIV>
<DIV><FONT face=3DFixedsys size=3D1>term tussen haakjes uit te=20
werken.&nbsp;</FONT></DIV>
<DIV><FONT face=3DFixedsys size=3D1></FONT>&nbsp;</DIV>
<BLOCKQUOTE dir=3Dltr style=3D"MARGIN-RIGHT: 0px">
  <DIV><FONT face=3DFixedsys size=3D1>int x =3D 10;</FONT></DIV>
  <DIV><FONT face=3DFixedsys size=3D1></FONT>&nbsp;</DIV>
  <DIV><FONT face=3DFixedsys size=3D1>a)&nbsp;&nbsp;&nbsp; x =3D x + (x =
=3D=20
  3);&nbsp;&nbsp;&nbsp; -</FONT><FONT face=3DFixedsys =
size=3D1>&gt;&nbsp;resultaat x=20
  =3D 13;</FONT></DIV>
  <DIV><FONT face=3DFixedsys size=3D1></FONT>&nbsp;</DIV>
  <DIV><FONT face=3DFixedsys size=3D1>b)&nbsp;&nbsp;&nbsp; x&nbsp;=3D (x =
=3D 3) +=20
  x;&nbsp;&nbsp;&nbsp; -&gt; </FONT><FONT face=3DFixedsys =
size=3D1>resultaat x =3D=20
  6;</FONT></DIV>
  <DIV><FONT face=3DFixedsys size=3D1></FONT>&nbsp;</DIV></BLOCKQUOTE>
<DIV dir=3Dltr><FONT face=3DFixedsys size=3D2>Iemand een antwoord ? =
</FONT></DIV>
<DIV dir=3Dltr><FONT face=3DFixedsys size=3D2></FONT>&nbsp;</DIV>
<DIV dir=3Dltr><FONT face=3DFixedsys size=3D2>Bedankt ! </FONT></DIV>
<BLOCKQUOTE dir=3Dltr style=3D"MARGIN-RIGHT: 0px">
  <DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
  <DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV></BLOCKQUOTE>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV></BODY></HTML>

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Re: [JAVA] - prioriteitsregels

#1316

Author: Aquila
Date: Mon, 16 May 2005 17:50

23 lines
1725 bytes

alias wrote:

>   int x = 10;
> 
>   a)    x = x + (x = 3);    -> resultaat x = 13;
> 

evaluatie van links naar rechts:
linkse term: x blijft 10
rechtse term: returnvalue 3, x = 3
10 + 3 = 13

>   b)    x = (x = 3) + x;    -> resultaat x = 6;

evaluatie van links naar rechts:
linkse term: returnvalue 3, x = 3
rechtse term: x is nu 3
3 + 3 = 6

Maar natuurlijk is je code al bijzonder ingewikkeld als je dit soort
statements begint te gebruiken...
-- 
"May the source be with you"

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