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• Why is multiple inheritance not supported in most of programming language?

  - by Starx

  Why is multiple inheritance not supported in most of programming language? I could really use this feature to develop different layout of application?

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• Why isn't there generic variance for classes in C# 4.0?

  - by devoured elysium

  If we have it for interfaces, why dont we have it also for classes? What would be the problem that we would incurr when using it? Thanks

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• Why are there differences when compiling with ./ and ./make in linux?

  - by ctyler1

  I have a friend who wrote code for a large array with 1,048,576 maximum elements. Everything runs fine when complied using ./make but but when using just ./ we get a segmentation fault. It's obviously not too crucial of a prob to solve. Nonetheless, I am very curious about it. if anyone has seen this or has any Ideas as why...

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• Why is recordset result being returned in this way for Python database query?

  - by Scott

  I have searched high and low for an answer to why query results returned in this format and how to convert to a list. data = cursor.fetchall() When I print data, it results in: (('car',), ('boat',), ('plane',), ('truck',)) I want to have the results in a list as ["car", "boat", "plane", "truck"]

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• Why is it necessary to remove and then re-add a user to a SQL Server database after restoring it fro

  - by Craig Johnston

  Why is it necessary to remove and then re-add a user to a SQL Server database after restoring it from a file? If I don't do this, I get a "User login failed" when trying to access the database using this username from apps.

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• Why is it that sometimes my web application does not work on the iPhone?

  - by alex

  I have a web application that uses login and sessions (cookies). Why is it that sometimes, when the iPhone is going slow with the 3G network (super super slow), the iphone doesn't see the cookies? Cookies don't work when the iPhone network is slow!!!

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• Why do I never see the prototype property in JavaScript code I edit?

  - by yaya3

  Why do I never see the prototype property in JavaScript code I edit, from books and documentation I've read, it seems to be a cornerstone of the language.

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• Why does echo-ing "<! <" return "<! >"?

  - by mkeblx

  Here is my exact code. <?php echo "<! <"; ?> And this is the returned string. <! > Why is the last character changing?

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• Why isn't `"repeat" * 3` the same as `3 * "repeat"` in Ruby?

  - by levirg

  When I type this: puts 'repeat' * 3 I get: >> repeat repeat repeat But it's not working if I do this: puts 3 * 'repeat' Why?

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• Why aren't return types considered in Java method overloads?

  - by Gogi

  Why return type of a method is not considered in method overloading ? Can somebody explain , how compiler checks for overloaded methods ?

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• Why is not advisable to use goto frequently? [closed]

  - by Babiker

  Possible Duplicate: GOTO still considered harmful? I have read articles that advise on refraining from using the goto operator frequently, but never told why. I have googled this for ever and can't really find anything.

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• Why do websites generate random alphanumeric strings for urls instead of using row ids?

  - by jorm

  Why does many sites (youtube is good example) generate string of random number and letter instead of using for example the row id? usually its something likes this bla?v=wli4l73Chc0 instead of like bla?id=83934 Is it just to keep it short if you have many rows? Or is there other good things about this? Because i can imagine: bla?id=23934234234 dont look so nice Thanks and cheers

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• Silverlight, reducing xap size setting, why dlls still included?

  - by tony

  Hi I've used the "Reduce XAP size by using Application library caching" setting. I see that some dlls are now excluded from the .xap file but some aren't, specifically System.Reactive.dll System.Windows.Controls.DataVisualization.Toolkit.dll System.Windows.Controls.Theming.Toolkit.dll System.Windows.Controls.Toolkit.dll Any idea why this is the case? thanks

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• Asterisk sometimes on variable type, sometimes on variable name. Why?

  - by Moshe

  In Objective-C, I've seen, for example: UIPickerView *tweetPicker and UIPickerView* tweetPicker What does the asterisk mean (I know, the first part is a dupe...) and why does it go on different parts of the deceleration in different contexts?

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• Why does Linq to Entities generate Left Outer Joins?

  - by DJCasey

  I was wondering if anyone knew why linq to entities always seems to generate left outer joins. I would understand it on an optional relationship but it doesn't make good sense when the relationship is mandatory. Does anyone have any idea how to make it generate inner joins instead?

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• Why do I need an intermediate conversion to go from struct to decimal, but not struct to int?

  - by Jesse McGrew

  I have a struct like this, with an explicit conversion to float: struct TwFix32 { public static explicit operator float(TwFix32 x) { ... } } I can convert a TwFix32 to int with a single explicit cast: (int)fix32 But to convert it to decimal, I have to use two casts: (decimal)(float)fix32 There is no implicit conversion from float to either int or decimal. Why does the compiler let me omit the intermediate cast to float when I'm going to int, but not when I'm going to decimal?

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• Why can't I access the instance.__class__ attribute in Python?

  - by froadie

  I'm new to Python, and I know I must be missing something pretty simple, but why doesn't this very, very simple code work? class myClass: pass testObject = myClass print testObject.__class__ I get the following error: AttributeError: class myClass has no attribute '__class__' Doesn't every object in Python have a __class__ attribute?

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• What is a raw type and why shouldn't we use it?

  - by polygenelubricants

  Questions: What are raw types in Java, and why do I often hear that they shouldn't be used in new code? What is the alternative if we can't use raw types, and how is it better? Similar questions Should Java Raw Types be Deprecated?

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• C++ extern keyword on functions. Why no just include the header file?

  - by user199421

  If I understand it correctly this means extern void foo(); that the function foo is declared in another translation unit. 1) Why not just #include the header in which this function is declared? 2) How does the linker know where to look for function at linking time?

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• Why can't you call a non-static method from a static method?

  - by VoodooChild

  I have a static method [Method1] in my class, which calls another method [Method2] in the same class and is not a static method. But this is a no-no. I get this error: An object reference is required for the non-static field, method, or property "ClassName.MethodName()" Can someone please briefly describe why? including other things that might be related to this.

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• Why are there magic attributes exposed in the Servlet spec?

  - by Brabster

  It's always seemed a little at odds with the principles of Java that the Java Servlet Spec (2.5 version here) includes a set of magic attributes containing info about included resources, namely: javax.servlet.include.request_uri javax.servlet.include.context_path javax.servlet.include.servlet_path javax.servlet.include.path_info javax.servlet.include.query_string It's not even specifically pointed out in the API documentation, only in the spec where it is a must for correct implementation. This approach feels very wrong, an exposed implementation detail that clients will use and depend on. Why is this information exposed in this way?

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• Why is it that I can include a header file in multiple cpp files that contains const int and not have a compiler error?

  - by tree

  Let's assume that I have files a.cpp b.cpp and file c.h. Both of the cpp files include the c.h file. The header file contains a bunch of const int definitions and when I compile them I get no errors and yet I can access those const as if they were global variables. So the question, why don't I get any compilation errors if I have multiple const definitions as well as these const int's having global-like scope?

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• Why attached property Set and Get static methods are not called in XAML?

  - by JD

  Hi, I have set break points on my attached properties SetXXX and GetXXX static methods. In Xaml, I have assigned values to the attached property. However, I was expecting the Set or Get static methods to be called but they are not. The attached property works as expected and if I call SetXXX and GetXXX methods in code, then it works are expected. Why are the methods not called when set from Xaml? JD.

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• Why column rename script generated by SSMS uses temporary name?

  - by abatishchev

  When I rename a table column in Designer mode in SQL Server Management Studio 2008 (both R2 and non-R2) and generate a change script it looks like this: EXECUTE sp_rename N'table.column', N'Tmp_columnNew', 'COLUMN' GO EXECUTE sp_rename N'table.Tmp_columnNew', N'columnNew', 'COLUMN' GO What for temporary column name is used? Why don't rename at once?

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• Why can I not access this class member in python?

  - by Peter Smit

  I have the following code class Transcription(object): WORD = 0 PHONE = 1 STATE = 2 def __init__(self): self.transcriptions = [] def align_transcription(self,model,target=Transcription.PHONE): pass The important part here is that I would like to have a class member as default value for a variable. This however gives the following error: NameError: name 'Transcription' is not defined Why is this not possible and what is the right (pythonic) way to do something like this.

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