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• Why does searching an index have logarithmic complexity?

  - by Lieven Cardoen

  Is an index not similar to a dictionary? If you have the key, you can immediately access it? Apparently indexes are sometimes stored as B-Trees... why is that?

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• Why does jquery behave like this

  - by andrei

  $('.box').click(function(){ $(this).find('p').toggle( function () { $(this).css({"color" : "red"}); }, function () { $(this).css({"color" : "black"}); } ); }); if i execute this script the 'p' color will change if i click on the 'p' not on the .box class why ? And how to i make it so that 'p' color changes when i click on the .box div

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• Why use Visual Studio 6 for C++

  - by robUK

  Hello, I am just wondering why programmers who program in C++ for windows always use Visual Studio 6 instead of Visual Studio 2008? Isn't the compiler in 2008 much better than the one in VS6? The reason I ask as I have used many sdk's that are always written in VS6? Many thanks, Steve

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• pls give reason why this java program always comes to the else part

  - by Anbu

  public class Test { public static void main(String[] args){ if (5.0 5) // (5.0<5) for both case it is going to else System.out.println("5.0 is greater than 5"); else System.out.println("else part always comes here"); /another sample/ if (5.0 == 5) System.out.println("equals"); else System.out.println("not equal"); } } can any one explain the first "if statement" why it always come to else part

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• Why getResourceAsStream method is in Class class?

  - by anupsth

  Why public InputStream getResourceAsStream(String name) is in Class class? It just give inputstream of file which is in jar file and there is no relation with Class class. so it can be static method and it can be in any class.

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• why the sexp has array in the end

  - by dorelal

  RubyParser.new.parse "1+1" s(:call, s(:lit, 1), :+, s(:array, s(:lit, 1))) Above code is from this link Why there is array after + in the Sexp. I am just trying to learn ruby parser and the whole AST thing. I have been programming for a while but have no formal education in computer science. So do point to good article which explains AST etc. Please no dragon book. I tried couple of times but couldn't understand much of that book

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• Why did you stop using Tapestry?

  - by ntownsend

  This question goes out to those who have used Tapestry as a web framework and then either gave it up or switched to something else, or even ported their application from Tapestry to something else. The question is why? What led you to make this change? EDIT: Also, what framework (if any) did you change to?

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• Why must I make a protocol like this?

  - by mystify

  @protocol SomeDelegate<NSObject> //stuff... @end Why the <NSObject> part? Couldn't I just do @protocol SomeDelegate //stuff... @end ?

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• Why is setscheduler not forcing need resched

  - by EpsilonVector

  I noticed that in Linux kernel 2.4 setscheduler doesn't force need_resched. Why is that? is it just some convention, or does that happens somewhere else?

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• Why is my view not resizing after rotating?

  - by E-Madd

  I'm only supporting the portrait orientation, but both the right-side-up and upside-down versions. Why do my subviews not resize appropriately? There's a status bar sized black space at the top of the view. If I change tabs and come back, it's corrected.

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• Why are there only four registers?

  - by cam

  Why are there only four registers in the most common CPU (x86)? Wouldn't there be a huge increase in speed if more registers were added? When will more registers be added?

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• Why is T() = T() allowed in C++?

  - by Rimo

  I believe the expression T() creates an rvalue (by the Standard) However the following code compiles (at least on gcc4.0) class T {... }; int main() { T() = T(); } I know technically this is possible because member functions can be invoked on temporaries and the above is just invoking the operator= on the r-value temporary created from T(). But conceptually this is like assigning a new value to an r-value. Is there a good reason why this is allowed?

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• Why is 0.2 + 0.7 not 0.9? [closed]

  - by jAndy

  Possible Duplicate: Is JavaScript’s math broken? Example: var result = 0.2 + 0.7; alert(result); In Javascript, the result is NOT as expected 0.9 Why?

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• Why would someone need an in-memory database?

  - by BrainOverflow

  I read that a few databases can be used in-memory but can't think of reason why someone would want to use this feature. I always use a database to persist data and memory caches for fast access.

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• [.NET] Why is struct better with being less than 16 bytes

  - by user149578

  Hi folks: I'm studying struct; some book advises creating struct if it has an instance size less than 16 bytes. Why? Thanks for any reply.

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• Why Create Mock Objects?

  - by Chris

  During a recent interview I was asked why one would want to create mock objects. My answer went something like, "Take a database--if you're writing test code, you may not want that test hooked up live to the production database where actual operations will be performed." Judging by response, my answer clearly was not what the interviewer was looking for. What's a better answer?

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• 42S22 SQL error: Column not found, why?

  - by Vincenzo

  This is my SQL: SELECT `tbl`.*, 123 AS `test` FROM `tbl` GROUP BY `test` It works when I run it directly in MySQL. But PDO says: SQLSTATE[42S22]: Column not found: 1054 Unknown column 'test' in 'field list' Why so? How to cure this problem? I'm using Zend_Db.

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• Which one is faster and why?

  - by The Machine Charmer

  (n >= 3 ) && (n <= 99) OR n `elem` [3..99] Which one is faster and why?

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• Why is Python so slow?

  - by Riemannliness

  Why is Python such a slow language, on average, compared to C/C++? I learned Python as my first programming language, but I've only just started with C and already I can feel and see the difference.

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• Why thread specific data is required in pthread ?

  - by user504542

  Hi As i know, all the threads share memory location. For example a global variable changes in one thread will reflect in another thread. Since each thread has its own stack, the local variables that are created inside the thread is unique. In this case, why do we need to go for thread specific data mechanism?. Can't it be achieved by auto storage varibles inside the thread function ? Kindly clarify!!!. BR Rj

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• Why remote git server should have --bare

  - by dorelal

  I am reading these two articles. However I still do not get --bare option. If the server has no working directory and if a new member of the team clones the project then that person will not get any content. Any further clarification will help on why --bare is needed.

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• Why Duplicate the “Release” configuration to "Disctribution"?

  - by Horace Ho

  On the Apple guide, there is a step before building the AppStore version: Open the Xcode project and Duplicate the “Release” configuration in the Configurations pane of the project's Info panel. Rename this new configuration “Distribution”. Why this step is needed? Can I skip this step and use the "Release" configuration to build the final version for AppStore?

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• Why is $b "b" in this logic?

  - by user275074

  I'd have expected $b to be 'a' but it is 'b', why is this the case? $a = "b"; $b = "a";

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• Why doesn't these links work in IE7 ?

  - by Patrick

  hi, I don't understand why I cannot click the tags on top in IE7 on this website: http://www.sanstitre.ch/drupal/portfolio?tid[0]=38http://www.sanstitre.ch/drupal/portfolio?tid[0]=38 It says javascript error but I debugged with Firefox and I don't get any error... Could you give me some help ?

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• Why can't one ctor call another ctor to initialize the object

  - by skydoor

  class Foo { public: Foo() { Foo(1)} Foo(int x, int y = 0):i(x) {} private: int i; } Can anybody give me some reasonas about can I do this? If not why?

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