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• Why do some people use "None" as enumeration member ?

  - by alex

  I noticed that some enumerations have "None" as a enumeration member. For example what I mean enum Mode { Mode1 = 1, Mode2 = 2, Mode3 = 3, None = 4 } Why do they use it ? In what cases solution with a none member is more preferable (less preferable) ?

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• Why does the default view for a List in ASP.NET MVC use 'var' to iterate through the items?

  - by SLC

  The title pretty much sums it up, it puts the following line of code in: <% foreach (var item in Model) { %> As the View is auto-generated and uses reflection to work out exactly what item is, so you get intellisense and everything, I just wonder, why do they use var rather than the actual type?

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• Why use your application-level cache if database already provides caching?

  - by vsb

  Modern database provide caching support. Most of the ORM frameworks cache retrieved data too. Why this duplication is necessary?

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• Why I can't see the background image in the device, but appears on the simulator?

  - by Tattat

  Here is the viewDidLoad: [self.view setBackgroundColor:[UIColor colorWithPatternImage:[UIImage imageNamed:@"bg.png"]]]; It can show the simulator, but not on the device, why?? thz.

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• why can't I call methods on a for-yield expression?

  - by 1984isnotamanual

  Say I have some scala code like this: // outputs 1, 4, 9, 16, 25, 36, 49, 64, 81, 100 println( squares ) def squares = { val s = for ( count <- 1 to 10 ) yield { count * count } s.mkString(", "); } Why do I have to use the temporary val s? I tried this: def squares = for ( count <- 1 to 10 ) yield { count * count }.mkString(", ") That fails to compile with this error message: error: value mkString is not a member of Int def squares = for ( count <- 1 to 10 ) yield { count * count }.mkString(", ") Shouldn't mkString be called on the collection returned by the for loop?

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• Why does the first access to a JSP file take longer on the Google App Engine?

  - by Spines

  Here is my test: I access a servlet to get the JVM to load (absorb the loading request). Then i access a JSP that has <%= 5+7 %> in it and nothing else. The first access to this JSP uses 350ms of CPU time and has latency of 200ms. Subsequent accesses only have latency and cpu time of about 20ms. Why does the first access to the jsp after starting the servlet container take longer?

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• Is there any guide on "When to use display:block when :inline and when :inline-block" and why?

  - by metal-gear-solid

  Do you know any good article on "When to use display:block when :inline and when :inline-block" and why? and when we will have to override display:?? through css for any HTML tag/element?

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• why use symfony's admin panel instead of phpmyadmin for CRUD?

  - by fayer

  in symfony you can generate an admin panel for CRUD operations. i wonder why i should use that one and not doing CRUD directly in phpmyadmin? what are the benefits with an admin panel? thanks

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• why use admin panel instead of phpmyadmin for CRUD?

  - by fayer

  in some frameworks (symfony) you can generate an admin panel for CRUD operations. i wonder why i should use that one and not doing CRUD directly in phpmyadmin? what are the benefits with an admin panel? thanks

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• Why do I need the isset() function in php?

  - by Chris

  I am trying to understand the difference between this: if (isset($_POST['Submit'])) { //do something } and if ($_POST['Submit']) { //do something } It seems to me that if the $_POST['Submit'] variable is true, then it is set. Why would I need the isset() function in this case?

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• Why Trigger is null in the code behind (Silverlight)?

  - by Xin

  I have created a trigger in the xaml but when I want to access one of its properties in the code behind it always gives me a null value. Anyone knows why?

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• Why are there so many javascript files in my empty MVC 2 project?

  - by niaher

  When creating an empty MVC 2 project, I have a lot of javascript files in my Scripts folder. Why? Will removing them affect my application?

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• Why call-by-value evaluation strategy is not Turing complete?

  - by Roman

  I'm reading an article about different evaluation strategies (I linked article in wiki, but I'm reading another one not in English). And it says that unlike to call-by-name and call-by-need strategies, call-by-value strategy is not Turing complete. Can anybody explain, please, why is it so? If it's possible, add an example pls.

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• Flushing of cout prior to reading input using cin .. why?

  - by yapkm01

  Why does cout has to be flushed before cin starts reading? Aren't they of different buffer? I can have reading of input into a buffer while same time putting it on output buffer (before flushing) .. 2 different buffers. I am confused here.

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• Why Java does not allow overriding equals(Object) in an Enum?

  - by Ashwin Prabhu

  @Override public boolean equals( Object otherObject ) is not allowed in Java for an Enum, since the method equals(Object x) is defined as final in Enum. Why is this so? I cannot thing of any use case which would require overriding equals(Object) for Enum. I'm just curious to know the reasoning behind this behavior.

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• Why does obj.getBounds().height give a larger height than obj.height?

  - by TC

  I'm new to Flash and ActionScript, but managing quite nicely. One thing that is continuously getting in my way are the width and height properties of DisplayObject(Container)s. I'm finally starting to get my head around them and learned that the width and height of a Sprite are determined solely by their contents for example. I do not understand the following though: I've got a Sprite that I add a bunch of Buttons to. The buttons all have a height of 30 and an y of 0. As such, I'd expect the height of the containing Sprite to be 30. Surprisingly, the height is 100. The Adobe documentation of the height property of a DisplayObject states: Indicates the height of the display object, in pixels. The height is calculated based on the bounds of the content of the display object. Apparently, the 'bounds' of the object are important. So I went ahead and wrote this little test in the Sprite that contains the Buttons: for (var i:int = 0; i < numChildren; ++i) { trace("Y: " + getChildAt(i).y + " H: " + getChildAt(i).height); trace("BOUNDS H: " + getChildAt(i).getBounds(this).height); } trace("SCALEY: " + scaleY + " TOTAL HEIGHT: " + height); This code iterates through all the objects that are added to its display list and shows their y, height and getBounds().height values. Surprisingly, the output is: Y: 0 H: 30 BOUNDS H: 100 ... (5x) SCALEY: 1 TOTAL HEIGHT: 100 This shows that the bounds of the buttons are actually larger than their height (and the height that they appear to be, visually). I have no clue why this is the case however. So my questions are: Why are the bounds of my buttons larger than their height? How can I set the bounds of my buttons so that my Sprite isn't larger than I'd expect it to be based on the position and size of the objects it contains? By the way, the buttons are created as follows: var control:Button = new Button(); control.setSize(90, 30); addChild(control);

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• why cant we call start method twice on a same instance of the Thread object?

  - by GK

  I was reading about the thread and found that we cant call start method twice on the same thread instance. But i didnt get the exact reason for the same. so why we cant call it twice or even more times?

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• Why does compiler complain when I try to convert to a base-class?

  - by John

  class BaseClass { ... }; class SubClass { ... }; class MyApp { SubClass *pObject; BaseClass *getObject() { return pOject; } }; I get a compiler error: error C2440: 'return' : cannot convert from 'SubClass *' to 'BaseClass *' Why doesn't it work, surely you can automatically convert to a base-class without any casting?

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• Why can't I get jQuery's live() or load() to work?

  - by dtryan

  Why does only the third method work? $('#jqtest').live('load', function() {$(this).html('hi');}); //1 $('#jqtest').load(function() {$(this).html('hi');}); //2 $(window).load(function() {$('#jqtest').html('hi');}); //3 <div id="jqtest">kldjfglkj</div>

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• Why is the return type not considered when differentiating methods?

  - by Silent Warrior

  The compiler does not consider return type when differentiating methods, so you cannot declare two methods with the same signature even if they have a different return type. Java Tutorial Why is this?

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• Why does Joomla not use private, public and protected keywords?

  - by jax

  I noticed that Joomla uses less secure var type for variables in classes Why is this? In my own components,plugins,modules should I follow this convention or use a more secure private, public and protected keywords.

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• Why when I try to instantiate a class instance, do I get StackOverFlowException?

  - by flockofcode

  I keep getting StackOverFlowException whenever I instantiate an instance of A class. I know it has got something to do with the fact that A.b field is of type derived from class A. But why would that cause an exception? static void Main(string[] args) { A a = new A(); // exception } class A { private B b = new B(); } class B:A {} thank you

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• Why my NUnit tests execute in different order than they are listed?

  - by JMSA

  Why my NUnit tests execute in different order than they are listed? And upon what the execution order depends?

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• Why is this C program giving a wrong output?

  - by JMSA

  Why is this C program giving a wrong output? #include<stdio.h> void main() { float f = 12345.054321; printf("%f", f); getch(); } Output: 12345.054688 But the output should be, 12345.054321. I am using VC++ in VS2008.

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• Why is it that I can't reference a global variable directly in PHP?

  - by DKinzer

  I'm curious to know why the following code behaves differently? The following does not work: $_variable &= global $_global; echo $_variable; The following works: global $global; $_variable &= $_global; echo $_variable; ?

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