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• Does malloc(0) return a valid pointer or NULL?

  - by Jaspreet

  Hi Malloc() is used for dyamic memory allocation and returns a pointer (void*) to the memory allocated. What happens if i pass zero in malloc as an argument. Does a valid memory allocation takes place? Explain

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• pgSQL query error

  - by running4surival

  i tried using this query: "SELECT * FROM guests WHERE event_id=".$id." GROUP BY member_id;" and I'm getting this error: ERROR: column "guests.id" must appear in the GROUP BY clause or be used in an aggregate function can anyone explain how i can work around this?

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• is it possible in javascript to create shortcuts with sequence like 123,345 instead of combo?

  - by frankB

  I already used some script to implement the shortcuts in my web page but i was wondering if could be possible to associate some combination not syncronic like Ctrl+X but more like a sequence typing 1..2..3 or any other combination to execute a script... lets assume this example: you have a long list with numbers: you could type 3..5...6, so you can go to the item 356 passing trough the item 3 then 35 then 356 more or less like when you type while selecting a select box i hope it was clear, id not easy to explain...

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• Python references

  - by hekevintran

  Can someone explain why the example with integers results in different values for x and y and the example with the list results in x and y being the same object? x = 42 y = x x = x + 1 print x # 43 print y # 42 x = [ 1, 2, 3 ] y = x x[0] = 4 print x # [4, 2, 3] print y # [4, 2, 3] x is y # True

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• carry flag and subtraction issue!

  - by Zia ur Rahman

  If a large number is subtracted from a smaller number then borrow is needed. The carry flag plays the role of borrow during the subtraction operation. Now suppose we want to subtract 56 from 66, obviously the borrow is needed and carry flag will be set. Now how this subtraction is performed to get the result -10, how computer will distinguish that the result is going to be a negative number. Please explain the process.

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• Does putting Java source files into a JAR increase the JVM's RAM consummed ?

  - by thecoder

  If not, why not always include sources file into "open source" JAR distributions ? (thanks in advance if you have some official weblinks that explain your answers)

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• Where to use Inner Class in professional java developement life?

  - by abc

  Where to use Inner Class in professional java developement life? Please explain.. googling didn't wrk efficiently..

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• Is SQLlite strong enough to use as wordpress database ?

  - by justjoe

  i'm just curious. so i ask this particular question about SQLite. I haven't use this type of database extensively. but care to explain what is the basic different between SQLite and Mysql ? The reason behind all of this is i just want to know whether it possible to use it to store wordpress data and act as a database ?

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• Will this only allow certain extensions?

  - by Dr Hydralisk

  I found this snippet that says will only allow certain file types. Will it work and could someone bypass it to upload what ever file type they want? And could someone explain the substr part, i don't get how it works.. <?php function CheckExt($filename, $ext) { $name = strtolower($filename); if(substr($name, strlen($name) -3, 3) == $ext) return true; else return false; } ?>

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• How to list available instances of SQL Servers using SMO in C#?

  - by Cute

  Hi Can anybody explain me what I wrong I am doing in the following piece of code: DataTable dt=SmoApplication.EnumAvailableSqlServer(true); Server sr = new Server("Test"); foreach(DataBase db in sr.DataBases) { Console.WriteLine(db["name"]); } It gives an exception in sr.Databases that can not be connected.

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• what is facebox and thickbox

  - by Muthumari

  Hi, Can u explain Facebox and thickbox. What is the difference between facebox and thickbox.which one is used to better.Thanks in advance.

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• Python new-style classes and __subclasses__ function

  - by Fraser Graham

  Can somebody explain to me why this works (in Python 2.5) : class Foo(object): pass class Bar(Foo): pass print(Foo.__subclasses__()) but this doesn't : class Foo(): pass class Bar(Foo): pass print(Foo.__subclasses__()) The latter returns "AttributeError: class Foo has no attribute '__subclasses__'" but i'm not sure why. I know this is related to old-style vs. new-style classes but i'm not clear on why that would make this functionality unavailable.

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• Why can VS not display my WPF application in the designer, but it can run it just fine?

  - by Adam S

  This is absolutely ridiculous! Visual Studio is able to run (debug) my program just fine, but it won't display my layout in the designer. It just gives this useless error: Can anyone help explain this? I have not changed the XAML at all, not a single character, since the last time it worked fine. I've only changed some .cs code.

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• How to balance load in a Apache + Mongrel application

  - by Will

  I was wondering if someone can explain how can a rails application be balanced. Two questions: Does it even help having separate rails applications reading from the same database in the same dedicated server? I understand Apache can balance load installing some extra modules? am i right? how can we accomplish this? (please provide explanation for dummies)

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• What is the use of . (dot) and -> operators in c. Are they both same or differ from each other.

  - by Idlecool

  i have a confusion while using "." and "-" operators in c while working with structures. Can anyone please explain me how do both these operators differ or they both are same. Is there somewhere else these operators can be used apart from structures?

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• database assignment

  - by eric

  Hi, Given the following table: CREATE TABLE T1 (A INTEGER NOT NULL); CREATE TABLE T3 (A SMALLINT NOT NULL); INSERT T1 VALUES (32768.5); SELECT * FROM T1; INSERT T3 SELECT * FROM T1; SELECT * FROM T3; What is the output of above query? If any error occured please declare the line of it?Explain your answer!

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• Subversion import existing project is much smaller than first checkout

  - by David

  I have an existing project that I imported into subversion using TortoiseSVN. Total project size says 1.45MB. Total folder size on my machine is 9.72MB. Create new folder, right-click, checkout 7.14MB transferred and 19.4MB on my machine. Can anyone explain this to me? I did a quick KDiff on the folders and they're identical.

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• what is a new way for remote desktop

  - by Emma

  i want to connect t my server without using remote desktop of windows or VNC . can you help me with another way and explain for me a new way for remote desktop? my server is : windows 2003

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• GCC compile time division error

  - by kartikmohta

  Can someone explain this behaviour? test.c: #include <stdio.h> int main(void) { printf("%d, %d\n", (int) (300.6000/0.05000), (int) (300.65000/0.05000)); printf("%f, %f\n", (300.6000/0.05000), (300.65000/0.05000)); return 0; } $ gcc test.c $ ./a.out 6012, 6012 6012.000000, 6013.000000 I checked the assembly code and it puts both the arguments of the first printf as 6012, so it seems to be a compile time bug.

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• android bluetooth

  - by yoavstr

  can someone explain to me the concept behind using bluetooth my project in my studies is to make an android app using bluetooth, SQLLIGHT and google app the app itself is a very easy one but i just dont get the tools i need to use : how does the bluetooth works? is there a simple example ? the concept behind android GUI (i allready nade one but i think i am not fully understood his power)? note : i am using v 2.1

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• What does "program to interfaces, not implementations" mean?

  - by ajsie

  One stumbles upon this phrase when reading about design patterns. But I don't understand it, could someone explain this for me?

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• Is it possible to classify OneNote pages in EverNote style tags?

  - by Ravisankar S

  The tags as used in OneNote is very different from EverNote. EverNote uses tags as gmail uses labels to classify emails. Is it possible to classify OneNote pages using tags / labels on the go? If so, would you please explain how to do it?

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• Chrome: Flash Video Player doesn't work

  - by Patrick

  hi, could you explain me why my flash video player doesn't work in Chrome while it perfectly works in other browsers ? (Firefox and IE) This is the link: http://www.sanstitre.ch/drupal/portfolio?tid[0]=66 You'll see it flickering... thanks

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• UIButton as a subview in UILabel

  - by Jayshree

  hi. i am trying to dynamically add a UIbutton as a subview to UIlable. but i am not able to click the button. it seems that the lable doesnt allow the buttonTapped event to occur. can somebody explain what exactly is happening here. and can anybody give me an alternative for this. thnx

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• Which eclipse files belong under Version Control

  - by sblundy

  Which eclipse files is it appropriate to put under source control, aside from the sources obviously. In my project, specifically, I'm wondering about: .metadata/* project-dir/.project project-dir/.classpath project-dir/.settings/* If there are any of these for which is depends, please explain your guidelines.

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