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• sql: self-joins explained

  - by every_answer_gets_a_point

  i dont understand the need for self-joins. can someone please explain them to me? a simple example would be very helpful

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• Doubt in Conditional inclusion

  - by Philando Gullible

  This is actually extracted from my module (Pre-processor in C) The conditional expression could contain any C operator except for the assignment operators,increment, and decrement operators. I am not sure if I am getting this statement or not since I tried using this and it worked.Also for other manipulation a probable work around would be to simply declare macro or function inside the conditional expression,something like this to be precise. Also I don't understand what is the rationale behind this rule. Could somebody explain? Thanks

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• Adding multiple images to AnimateDrawables sample code in Android

  - by Nator

  Hello, I was trying to add more than one images in the AnimateDrawables under com.example.android.apis.graphics, but for some reason I couldn't. Can anyone post a sample code on how to accomplish it or at least explain it to me? This beginner programmer would really appreciate it. Thanks

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• piping to variables

  - by lego69

  cut -d" " -f2 ${2} | $callsTo hello, can somebody please explain can I pipe the result of cut to variable callsTo, and how will it be stored, as the string or list?

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• How can I have a floating image (right aligned) with text that wraps around the image in Android Lay

  - by groomsy

  It's kind of hard to explain, but an example of what I'm wanting to accomplish is like this: Here is some text | image | that is printed | | out in a view and --------- it is wrapped around an image that is floating and right aligned. I thought about generating the layout in html and using a web view, but I need to be able to perform an action when the user clicks on the image. Does anyone have any ideas? Thanks in advance, groomsy

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• time required to finish the multithreaded program??

  - by user275131

  A java process starts 5 threads , each thread takes 5 minutes. what will be the minimum and maximum time taken by process? will be of great help if one can explain in java threads and OS threads. Edit : I want to know how java schedule threads at OS level.

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• Easy way to build an in-app demo like they do in Convertbot?

  - by mystify

  I want to make a little in-app demo like Tapbots does in Convertbot. Maybe there is a better solution than mine? make everything programmatically controlable write a huge class with hundreds of performSelector:withObject:afterDelay: calls to control the whole app for the demo The demo actually only does two things: Simulate touches on controls (i.e. programmatically pressing buttons) Show text message bubbles when appropriate to explain what is going on How would you do it?

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• Need of serialization in Java

  - by JavaUser

  Hi , Can anyone tell me what is the need of Serialization in Java and an example scenario to explain the need . I dont need the definition .

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• What will be the return status in the following sheel script.

  - by Pradip Bhojania

  i have two shell scripts: script1.sh echo "date : DATE" exit 0; script2.sh ./scripts1.sh if [ $? -eq 0 ]; then reboot; else echo "Failed" fi What should be the result. Ideally it should have been "reboot" , however on some execution i got the "failed" message too. Can anyone explain why this happens?

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• Advice on reading indexes

  - by London

  Hello, I'm trying to figure out the right way to read lucene index only once whilst running the application multiple times, how can I do that in java? Because indexed data will not change so reading them each time would not be necessary. Can someone explain me the logic of it reading them only once? thank you

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• What is the significance of Thread.Join method in c sharp .net ?

  - by Techee

  What is the significance of Thread.Join method in c sharp .net ? MSDN says that it blocks the calling thread until a thread terminates. Can anybody explain this with a simple example ?

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• problem with seting GET value

  - by Syom

  in my site i want to set default page to open, using this script if (!isset($_GET)) { $_GET['id'] = "home"; } but it doesn't work. can somebody explain why?

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• Is it possible to use 'variables' for css / html element ?

  - by stighy

  Hi, i would like to make 'skinnable' a web site written in asp.net... I explain: for example, i have a 'div' element, and i would like to define a background-color using a variable, not a fixed value. How can i do ? Css ? Or other tecniques ? Thanks

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• xslt: operations on new elements

  - by user1495523

  Could you please explain in case we could perform any operations on newly included elements using xsl? To explain using an example: if we have the following input file <?xml version="1.0" encoding="UTF-8"?> <top> <Results> <a>no</a> <b>10</b> <c>12</c> <d>9</d> </Results> <Results> <a>Yes</a> <b>8</b> <c>50</c> <d>12</d> </Results> </top> We need the final result as <?xml version="1.0" encoding="UTF-8"?> <top> <Results> <a>no</a> <b>10</b> <b_>10</b_> <c>12</c> <c_>12</c_> <d>9</d> <e_>11</e_> </Results> <Results> <a>Yes</a> <b>8</b> <b_>8</b_> <c>50</c> <c_>50</c_> <d>12</d> <e_>29</e_> </Results> </top> Where: b_ = b, c_ = c, & e_ = (b_ + c_)/2

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• Dynamic allocation in C

  - by Kerby82

  I'm writing a program and I have the following problem: char *tmp; sprintf (tmp,"%ld",(long)time_stamp_for_file_name); Could someone explain how much memory allocate for the string tmp. How many chars are a long variable? Thank you, I would appreciate also a link to an exahustive resource on this kind of information. Thank you

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• Problem when uploading php file

  - by justjoe

  can anybody explain why uploaded php files treated by a server as a text file ? The symptom is when i try to access a php file, the server send me the content of the file.

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• PHP Regular expression flags

  - by incrediman

  Can someone explain what the 'e' flag does, or link me to somewhere that does? I couldn't find anything via google. Example: preg_replace("/a(b?)c/e", "search_foo_term('\$1')", $str);

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• Why subtract a value from itself (x - x) in Python?

  - by endolith

  In NumPy functions, there are often initial lines that do checking of variable types, forcing them to be certain types, etc. Can someone explain the point of these lines? What does subtracting a value from itself do? t,w = asarray(t), asarray(duty) w = asarray(w + (t-t)) t = asarray(t + (w-w))

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• Looking for an easy explanation of exec in PHP

  - by mohanvydehi

  I am having trouble understanding the exec function in PHP. Can someone please explain it to me in simple terms?

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• What problems does Reflection solve?

  - by Praveen

  Hi All, I went through all the posts on Reflection but couldn't find the answer to my question. Can you please tell me what were the problems in programming world before .Net Reflection came and how it solved those problems. Please explain with example.

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• Variables combined with && and ||

  - by gcc

  What do the last lines mean? a=0; b=0; c=0; a && b++; c || b--; Can you vary this question to explain with more interesting example?

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• Authentication Issues using WMI in C#

  - by Samiul

  Hi all, How can I use WMIUserID, WMIPassword, WMIAlternateCredentials using C#? Please try to explain with examples. Thanks.

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• Even more advanced .htaccess question

  - by Richard

  Got a great answer earlier, but unfortunately, I didn't explain the WHOLE situation: I need to rewrite: blog.domainname.com/archives/YYYY/MM/postname/ and www.blog.domainname.com/archives/YYYY/MM/postname/ to www.domainname.com/blog/postname/ Thanks in advance!

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• Besides DI, what benefits can I get from an IoC container?

  - by MOZILLA

  IoC Frameworks just make DI much easier, but it's not only DI that they do, they provide a host of other benefits over and above DI. I saw this comment in one of the answers to a question about DI and IoC. Can someone explain this in some more details? What are other benefits of IoC?

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• very confused please answer [closed]

  - by davit-datuashvili

  hi i am very surpise when somebody post question everybody are saying it is homework please show us your effort now i have done this code http://stackoverflow.com/questions/2902781/priority-queue-implementation question is is this implementation correct? and nobody tell me answer also this one http://stackoverflow.com/questions/2896811/question-about-siftdown-operation-on-heap-closed can anybody explain me what is happened?no one answer me why?

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