Question on Loop

Why is it when I try to print num, it cannot find symbol, but when I use while loop it can?
public class ForLoop {
     public static void main (String[] args) {
          int sum=0;
          for (int num=0; num<10; num++) {
               sum+=num;
          System.out.println(num);
          System.out.println("Total: "+sum);
}

ashok.kulhari wrote:
num variable is local variable for a LOOP block only and outside it cannot be access.Really? Gee I wish I had said that in my first reply.
</sarcasm>

Similar Messages

Few questions - game loop, data types, speed

Hello, I have a few questions after studying some topics in this forum regarding game creation:
1) What's the fastest way to wait in the game loop? I've seen two approaches:
thread.sleep(10)andsynchronized(this) { wait(10); }2) What data types shall I use? In C++ I use to prefer int over short in all cases, because 32bit hardware works faster with integers. Is this same on cell phones?
3) Speed of applications is slow. I just wonder wheter it's my fault. I was testing application, which only cleared the buffer and outputted FPS and I got around 20 frames. It was Nokia 6300 with 240x320 display. After testing on other phones I've found out that the bigger the resolution, the slower the game is going. Is this normal?
Thanks for replies...

1) You're not going to notice any really speed difference between the two code snippets. Read up on 'Threads', and you'll see why one may be used in place of the other depending on the situation. In general there may be a slight performance loss, however unnoticable, when using the synchronized version, but when you are multithreading it is likely necessary.
sleep(int) is impossible to interrupt, so it's generally a no-no in most situations. However we are talking about devices where every bit of performance helps, so as long as it works for ya, it's not a big deal.
2) The performance difference is fairly negligable, if any. The biggest thing to consider is memory requirements, and shorts take 1/2 the data.
Also, many phones don't support floating point data types, so you'll likely need to use ints/longs to calculate your values if you want to have any accuracy beyond whole numbers. Doing something like shifting bits or using 1000x values in your calculations can get around most of the problems when you can't use floats.
3) The biggest performance killers are IO, memory allocation, screen drawing; pretty much in that order. So I imagine that you are re-creating a new String object every time you output your FPS value on screen right? Doing that every frame would destroy any hopes of getting high-performance.
Just be careful, and never allocate objects when you can avoid it. anything where you concat String objects using + will cause your performance to die a horrible painful slow death. Remove anything that says 'new' from your main loop, and all String operations, and it'll likely speed things up a lot for ya.
Does your main loop have something like this?
g.drawString("FPS: " + currentFps, 0,0,Graphics.TOP | Graphics.LEFT);
This is very bad because of the String operation. It'll create a new String every frame.
If you have any more specicif questions, or you'd just like to pick the brain of a mobile game dev, stop by my messageboard:
http://attackgames.proboards84.com
Message was edited by:
hooble

Performance question on looping thrue blocks and items (forms 10.1.2.3)

Hi all,
I'm back again in Forms forum : ) !!! and I'm working on a new and very interesting project
version used : Forms [32 bits] Version 10.1.2.3.0 (Production)
A little question for gurus :
On former projects I used to call loops on blocks and item like shown below to do various things such as displaying buttons or showing canvas or different VA depending on the user or scenarios .
PROCEDURE FRM_BLK_ITM_LOOP IS
v_curblk varchar2(90); -- bloc courant
v_curitm varchar2(90); -- item courant
BEGIN
v_curblk := get_form_property(:SYSTEM.CURRENT_FORM,first_block); -- on récupère le 1er block de la form
LOOP
v_curitm := v_curblk||'.'||get_block_property(v_curblk,first_item); -- on récupère le 1er item du block
    WHILE v_curitm != v_curblk||'.'||get_block_property(v_curblk,last_item)
     LOOP -- tant que l'item n'est pas le dernier du block on loop
        v_curitm := v_curblk||'.'||get_item_property(v_curitm,nextitem); -- on récupère l item suivant
        if get_item_property(v_curitm,<some property>) = 'TRUE' then
          --- I can do something.... or adding more conditions if then etc...
        end if;
    END LOOP;
EXIT WHEN v_curblk = get_form_property(:SYSTEM.CURRENT_FORM,last_block); -- on sort losrqu on arrive au dernier block
v_curblk := get_block_property(v_curblk, nextblock); -- on passe au block suivant
END LOOP;
END;In my current project we work on quite huge forms which can have a consequent number of blocks and items.
And we must be very careful regarding performance issues as these forms are accessed via LAN and WAN.
So my question :
This method seems to be quite efficient as it goes thrue blocks and items sequences as they are defined in the builder comparing to go_block -> go_item ->do_something which can easily turn into nightmare-programming.
But I don't really know about network roundtrips with this kind of method.
Is everything done in the app server and then fetched to the client?
What triggers block-level and item-level can be fired during the execution of the loop ? and so one...
Thanks in advance for your advices on this matter.
Jean-Yves

Hmmm, I have to say I never bothered if Forms is in Socket mode or not; I enabled the network statistics, counted the roundtrips and looked for ways to get them lower (my old friend wireshark did also a good job regarding this) ;). But regarding the note Forms 6i uses Socket Connections by default, this might apply to 10g too (or the enhancement request was approved, who knows).
Frankly I am not entirely sure what Socket Mode means; I guess it's the mode the forms applet talks to the forms runtime; wheter it's stateful (via Sockets) or stateless (via HTTP / HTTPS) but this is just a wild guess, and I can't find informations on it quickly. I also enabled networkStats on my Developer Suite only, so I cannot tell if you can enable them on a full-fledged Application Server.
Anyway; as said I just counted the roundtrips and looked where I can avoid them when I made our application ready for WAN.
Another useful tool was Shunra VE Desktop which I used to simulate low bandwith networks with high latencys; I installed it on a virtual XP, started the application and tested how the Application performs. If something looked odd, I looked behind the scenes, built a little testform basing on the code behind and tried out various things; very often you can take advantage of the event bundling forms seems to make when you use several set_xyz calls as Francois also noted; e.g.
set_custom_property('bean_item', 1, 'PROPERTY', prop);
set_custom_property('bean_item', 1, 'PROPERTY', prop);
set_custom_property('bean_item', 1, 'PROPERTY', prop);
set_custom_property('bean_item', 1, 'PROPERTY', prop);
set_custom_property('bean_item', 1, 'PROPERTY', prop);
vRet := get_custom_property('bean_item', 1, 'PROPERTY);most certainly will cause just 1 roundtrip; but if you use get_custom_property in the middle of the set_custom_property calls you will encounter 2 roundtrips as forms needs to synchronize (you get a value from the bean so the forms runtime needs a response) with the forms applet whereas set_custom_property is a one-way-street which can be fired off simultaneous. The same applies to fbean.invoke and fbean.invoke_bool, fbean.invoke_char and the like. Of course if you are using more then one get_custom_property in this case the roundtrips will increase accordingly.
If you want to make use of event bundling make sure you fire off as much set_xyz as you can before forcing forms to synchronize (e.g. with get_xyz, or synchronize, create_timer,...)
cheers

Questions on looping

Hi all experts of iDVD,
I have burn the video in iDVD. My movies are set to loop. So, as expected the movie keeps looping. But how do I get back to the selection page ?
I press STOP but it doesn't go back to the selection page & it gives me a blank page.
I have to press EJECT & EJECT again to place the video in, then only will I be able to see the Selection page.
So when I set the video to loop, how do I get back to the selection page ?
Thanks

Captivate 8 introduced the common JavaScript API which gets and sets Captivate variables for both SWF and HTML5 output in the same way. You can read more about that here:
https://helpx.adobe.com/captivate/using/common-js-interface.html
Another great thing about Captivate 8, is that they exposed Captivate events to JavaScript. So, for example, you can listen for when a user submits a quiz question and execute your own JavaScript when that submit event occurs. Not only can you listen for this event, you also get information sent to you about that event... like what the correct answer was vs. what the student chose. What I'd recommend is that you subscribe to the following events:
CPAPI_QUESTIONSUBMIT
CPAPI_INTERACTIVEITEMSUBMIT
The event data sent back from the event will give you the information you need. Download the sample project from the article to find out how to subscribe to these events.

Basic Questions about Looping and Headers

Hello,
Relative SSRS newcomer here and I have a couple of foundational questions... These are based on the simple premise of the underlying dataset returning multiple rows of data, elements of each to be displayed on subsequent pages of the report.
Is it fair to day that the Table (or Matrix) are the basic elements used for an iterative report?
Assuming the above is true, I'm using a Table for my first experiment here.
I can iterate and display my records but I'm struggling with header and footer information.
I want to display header and footer information on each page the is part of the current record. I've tried to add these elements in the 'header row' of the table, but that doesn't seem to do it. I don't see any facility for a footer. Is
this to be accomplished with row groups or something?
Any guidance would be appreciated.

Hi Steven,
According to your description, you want to display interview questions and answers between interview name and date, and different interview name displays in different page. After testing the issue in my environment, we can use list to achieve your goal.
Please refer to the following steps:
Add a table to the design surface, drag question_name, question_answer fields from the Report Data pane to the table cells, and delete the last column of the table.
Click anywhere in a tablix data region, in the Grouping pane, Click Add Group, select Parent Group, in the Tablix Group dialog box, select interview_name, then click OK.
Right click [interview_name] next to details symbol, click insert row, select Inside Group – Below, then Inside Group – Above.
Delete the first row and the first column.
Merge all the cells in the first and last row, then drag interview_name to the first row and drag interview_date to the last row from the Report Data pane.
Add a List to the design surface, drag the tablix into the List.
Select and right click the List, in the Grouping pane, Click Group Properties, click Add button and select interview_name from the drop down list. Then click Page Breaks, and check Between each instance of a group check box, click OK.
The following screenshot is for your reference:
If you have any more questions, please feel free to ask.
Thanks,
Wendy Fu

AS 101 question on loops

I'm stuck on something that's really fundamental and it's
driving me nuts.
I've got five buttons labeled "btn_1", "btn_2", etc. When a
button is pressed, I'd like to trace it's corresponding number.
When I try this:
for(var i:Number=1;i<6;i++){
this["btn_"+i].onPress = function(){
trace(i);
... it traces "6" regardless of which button is pressed. I
know I'm missing a variable somewhere, but my grey matter's crapped
out. Help? Many thanks in advance.

yeah this is common with loops of this nature - because the
'last' number iterated to is 6 so the value of i is now 6 once the
loop completes. to remedy, store the current value of i in a
property of the btn instance then call that prop as in:

Security question infinite loop. How to break it?

My account rescue email address was set to an unauthorized address. The unauthorized user reset the security questions.
To change the security questions, you have to have the correct answers, OR the rescue address.
To change the rescue address, you have to have the security question answers.
There seems to be no way to fix this, and I've been trying for 20 minutes to find a phone number for account support, can't find it.

You might try contacting Apple through iTunes Store Support

Question about loops

hey guys,
with this piece of code here... right now I have it reading a dataSet and printing out the first Value out of 9 datapoints. How can I tweak this so that it would read through ALL 9 datapoints. I know i can do a loop but im not sure how to go about it!...
int numDataSets = dc.size(); // determine number of data sets in collection
      for (int i=0; i<numDataSets; i++) {
        dataSet ds = dc.get(i); // get the ith dataset
        String filename = ds.sourceFileName;
        System.out.println("the number of DataSets: " + numDataSets);
        dataEl el = ds.get(0); // get the 0th element of the ith dataset
        double value = el.getMainValue(); // get the associated main value
        int dateInt = el.getDateInt();
        //for (int dateInt=0; dateInt<0; dateInt++) {
        System.out.println("data set " + filename + ": value " + value + dateInt);
      }

You'd use a nested loop. It's no trouble to nest one loop inside another. Traditionally, if i is the index variable of the outer loop, then j is the index variable of the inner one.
By the way, if dc is a java.util.Collection (saying that it's a java.util.Collection means that it's a class that implements that interface, or implements a sub-interface of that interface), and if you're using JDK 1.5 or above, then you don't need to use an explicitly indexed for loop. You could just do this:
for(dataSet ds : dc) {
    // your code here
}And you could easily nest a similar loop inside of that.

Quick question about looping movie clips

I'm a REAL Flash novice, and I'm trying to get a movie clip to loop 3 times, and then continue on.
Here's the code I've written (I'm sure it's painful to see)
stop();
if (!loopCount) {
var loopCount:Number = 0;
loopCount++;
if (loopcount < 3) {
gotoAndPlay (1)
if (loopCount = 3) {
gotoAndPlay(363);
Could someone help me out?
Thanks,
Brandon

use double equal (==) to test for equality:
stop();
if (!loopCount) {
var loopCount:Number = 0;
loopCount++;
if (loopcount < 3) {
gotoAndPlay (1)
if (loopCount == 3) {
gotoAndPlay(363);

Question about Looping through tables in Adobe Form

Hello,
We have an adobe form which is to be filled offline. It consists of a table. Table can have repeating rows and user can add\remove rows as they wish. The cardinality of the context node where we need to bind this table data is set to 1n
We want to know the process to get all the values in the table back into our context node once the form is uploaded. I assume we need to loop through the table, and add elements to the context node. Can someone please let us know if were on the right track, and provide some sample code if possible?
<b>We cant figure out a way to loop through a table inside an Adobe form.</b>
We are using Web Dynpro Java with Adobe Livecycle Designer 7.1
Your help is much appreciated.
Thanks,
Rob.

Try using...
for (z = 0; z < 16; z++) {
this["cb"+z].setStyle("styleName", "cssCBstyle");
That is the way to target them. I haven't dealt with setting styles, so I can't answer for that aspect working or not.

Questions reg Looping through a Node inside a Currently Selected Node.

i have the following context structure in my WD application.
Parent Customer Node A<Cardinality 1.n & Selection 1.n & Singleton True>
      Child Addresses Node B<Cardinality 1.n & Selection 1.n & Singleton True>
              Child Attribute B.City
      Child Attribute A.Name
      Child Attribute A.Age
For the currently selected Parent Customer Element, i want to read the all the addresses this customer has. How to read all the addresses of the customer and loop through it & show it.
Any inputs are appreciated.

Hello Saravanan,
Please use the Singleton Concept.
Refer the following links.
http://help.sap.com/saphelp_nwce711core/helpdata/en/47/be673f79c8296fe10000000a42189b/frameset.htm
http://wiki.sdn.sap.com/wiki/display/WDJava/SupplyFunctionin+Webdynpro
http://www.sdn.sap.com/irj/scn/go/portal/prtroot/docs/library/uuid/60086bd5-9301-2b10-6f97-a14366a5602b/
if you have doubt in implementation then let us know.
Regards
Nizamudeen SM

Newbie question about looped querys

Hi there!
I'm starting in this thing of CF dev .
My question is the next;
I have a table with 2 foreign keys and want to order my
result this way :
a
1
name surname etc,etc
name surname etc,etc
2
name surname etc,etc
3
name surname etc,etc
name surname etc,etc
name surname etc,etc
b
1
name surname etc,etc
name surname etc,etc
2
name surname etc,etc
name surname etc,etc
and so on ...
a and b belong to foreign_key_1
1 and 2 belong to foreign_key_2
oneof my try codes for the query is the next one :
select foreign_key_1,foreign_key_2,name, surname,etc...
order by foreign_key_1 group by foreign_key_2
thank you in advance!

Use the group attribute of cfoutput. The cfml reference
manual has a excellent example. If you don't have one, the internet
does.

VideoDisplay and events question and looping the video?

i have a flex ap that starts a video via a button click, i also have an event handle to detect when the video is finished
code sample below
private function loadandstartvideo(event:Event):void
          var thisvideo:VideoDisplay = VideoDisplay.getChildbyName("thisvid")
          thisvideo.removeevent(event.Complete,videoDisplay)
          thisvideo.source = "path/to/vid/"
          thisvideo.addeventListen(event.complete,restartvid)
          thisvideo.play();
private function restartvid(event:Event):void
          var thisvideo:VideoDisplay = VideoDisplay.getChildbyName("thisvid")
          thisvideo.play()
the above code is not the exact code the problem i have is that the loadandstart switched the video just fine but the restartvid function never gets called?
anyone have a clue? if you need the exact code i can post it.

here is the actual code. i poisted the other post from a different computer...
playinto is the function called from the button click
private function playintro(boardID:Number):void
        introIndex = boardID;
        var boxid:Number = boardID - 1;
        var vidBoxName:String = "hwsVid" + String(boardID);
        var vidBox:VideoDisplay = VideoDisplay(HWSDisplay.getChildByName(vidBoxName));
        vidBox.source = "path to vid;
        tempWidth = vidBox.width;
        tempHeight = vidBox.height;
        tempX = vidBox.x;
        tempY = vidBox.y;
        vidBox.x = 0;
        vidBox.y = 0;
        vidBox.height = Number(disHeight.text)
        vidBox.width = Number(disWidth.text)
        vidBox.maintainAspectRatio = false;
        var tempVidBox:VideoDisplay = new VideoDisplay;
        var tempBoxName:String = "";
        var a:Number;
        for (a=1;a<10;a++)
                if (a != boardID)
                        tempBoxName = "hwsVid" + String(a);
                        tempVidBox = VideoDisplay(HWSDisplay.getChildByName(tempBoxName));
                        tempVidBox.visible = false;
        vidBox.addEventListener(Event.COMPLETE,onIntroComplete)
        vidBox.play()
private function onIntroComplete(event:Event):void
        var vidBox2:VideoDisplay = VideoDisplay(event.currentTarget);
        vidBox2.removeEventListener(VideoEvent.COMPLETE,onIntroComplete)
        vidBox2.source = "path to loop vid;
        vidBox2.x = tempX;
        vidBox2.y = tempY;
        vidBox2.height = tempHeight;
        vidBox2.width = tempWidth;
        vidBox2.addEventListener(VideoEvent.COMPLETE,restartVidLoop)
private function restartVidLoop(event:VideoEvent):void
        var vidBox:VideoDisplay = VideoDisplay(event.currentTarget);
        vidBox.removeEventListener(Event.COMPLETE,restartVidLoop);
        vidBox.addEventListener(Event.COMPLETE,restartVidLoop);
        vidBox.play();

Question: for loop

Hi, can anyone tell me why am I get a error message when I
click on the link? I checked the XML file is fine and images are
loaded properly except when I click the links which comes up an
error message that cannot find the URL. Thanks!

assuming you've run trace() functions and the urls appear to
be correct, you probably have white space (usually carriage
returns) at the end of the url.
you can check the length of one of your urls to confirm. to
remedy, strip the white space using the flash string
methods.

Question in switching for STP and loop

hi ,
i have a question in loop issue , will it occur in this case or not
i will describe my scenario as below :
now i have 4 switches connected with full mesh.
=================
3 of them has stp protocol enabled
only 1 of them is un manged and dont support STP protocol
====================================
the question is :
if i connected the 4 switches full mesh , will the loop occurs ??
as i believe , stp loop prevention depend on the switch itself not on their neighbour , but not sure from my understanding
wish to help
regards

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Posting
If there's only one or two non-STP switches, in a full mesh, you'll be okay. Once you have at least three non-STP switches, in a full mesh, you have a loop between them.

Question on Loop

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