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• What Does an OS Actually Do?

  - by Ell

  What exactly does an operating system do? I know that operating systems can be programmed, in, for example, C++, but I previously believed that C++ programs must be run under an operating system? Can somebody please explain and give links? thanks in advance, ell

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• Assignment operator in php

  - by Kyle J. Dye

  I am having a hard time determining what the =& (equals-ampersand) assignment operator does in PHP. Can anyone explain it? Is it deprecated? Thanks!

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• Calling class member through uninitialized class pointer

  - by Adil

  I have following code snippet: class ABC{ public: int a; void print(){cout<<"hello"<<endl;} }; int main(){ ABC *ptr = NULL: ptr->print(); return 0; } It runs successfully. Can someone explain it?

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• What is meant by porting an application X to a platform Y ?

  - by Neeraj

  Pretty clear from the title itself, what is meant by porting an application X to a platform Y? Say for example I have an application X running on some OS, say Y, What do I do to port this application to another OS say Z? Does this mean rewriting a new application A for Operating system Z that necessarily imitates the behavior of application X on Operating System Y. Please explain.

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• How does the Garbage-First Garbage Collector work?

  - by fahdshariff

  Hi Can someone explain how the G1 Garbage Collector works please? I haven't been able to find any comprehensive, easy-to-understand descriptions anywhere yet. Thanks

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• Backslashes in gsub (escaping and backreferencing)

  - by polygenelubricants

  Consider the following snippet: puts 'hello'.gsub(/.+/, '\0 \\0 \\\0 \\\\0') This prints (as seen on ideone.com): hello hello \0 \0 This was very surprising, because I'd expect to see something like this instead: hello \0 \hello \\0 My argument is that \ is an escape character, so you write \\ to get a literal backslash, thus \\0 is a literal backslash \ followed by 0, etc. Obviously this is not how gsub is interpreting it, so can someone explain what's going on? And what do I have to do to get the replacement I want above?

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• function calling with pre decrement condition in if

  - by thulasi

  void display(int a) { printf("\n%d",a); if(--a) display(a); printf("\n%d",a); } main() { display(4); } Please explain the above program. i can't understand.what is the output.ya sir i got oupt like this 4 3 2 1 0 1 2 3 how is it sir

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• why do i see THROW in a C library

  - by Bhagya

  When I do: less /usr/include/stdio.h (which is only a C library - nothing to do with C++) I see __THROW after quite a few function declarations. Also, comments above a few functions say that 'This function is a possible cancellation point and therefore not marked with __THROW' What is all this for? THROW is meant to be for exception handling.. but as far as I know, C doesn't provide any support for it... Plz explain.

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• Team Foundation Server Work Item customization -- Add a new Text Field

  - by Sunil Ramu

  May I know how to add a new custom text field in TFS to show the lastest revision number? Can anyone explain in deatil about Making use of work item’s XML and customize TFS work items. How to create custom window form control to add to work item.And installation of custom control runtime

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• Marshaling and Unmarshaling of kml codes for Google Earth

  - by Kayson

  May i inquire more knowledge on marshaling and unmarshaling of kml codes? Regarding those used in Google earth. I need to do a project on flight airlines, linking them with an arc which is a polygon to connect placemarks with placemarks. I've tried to compile sample codes of HelloKML but still unable to marshal and produce the kml codes itself. Please someone explain marshaling and unmarshaling of codes and producing of kml codes. Thanks in advance.

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• Asp.net - MVC1 vs MVC2

  - by FosterZ

  hi, can any one precisely explain the difference between ASP.NET MVC1 vs MVC2.. and if i'm having a project in MVC1, how can i migrate it to MVC2 ?

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• applicaion and local service lifetime

  - by rayman

  As i understoond, if we have local service of some application, as soon as the application goes down, the service goes down as well - is that true? and if it is, how can we make an application to run all the time without go down? (without using Alarm manager). i though that the purpose of local service is to answer this situation: " to make the application everlasting" please, if some1 could explain me this better, thanks, ray.

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• jQuery: color change doesn't work with Chrome and Safari

  - by Patrick

  hi, could you explain me why the following code doesn't work in Chrome and Safari, but only in Firefox ? if ($(this).css("color") == "Fuchsia"){ $(this).css("color","#000000"); } This is the link: http://www.sanstitre.ch/drupal/portfolio?tid[0]=38 If you scroll down and up you'll see "Eternal Tour" becoming purple and black again, because it is not anymore selected. (with FIrefox) With Chrome and Safari it remains black.

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• Linux: shell builtin string matching

  - by gmatt

  I am trying to become more familiar with using the builtin string matching stuff available in shells in linux. I came across this guys posting, and he showed an example a="abc|def" echo ${a#*|} # will yield "def" echo ${a%|*} # will yield "abc" I tried it out and it does what its advertised to do, but I don't understand what the $,{},#,*,| are doing, I tried looking for some reference online or in the manuals but I couldn't find anything. Can anyone explain to me what's going on here?

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• Using .NET, how and why to use the memcached?

  - by fredzvt

  I hear much talk about memcached, but when briefly studied on it, I couldn't understand what advantages I can take instead of using the good old Dictionary<string, object> to cache my data in my applications. Can someone explain it to me?

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• ajax/JS timed countdown?

  - by kieran

  Let me explain what I'm trying to do. I want to make a simple box which counts down numbers at intervals I specify. For example, I'd like to set it to start at 150, and then I want to set it to drop by 15 every 30 seconds. Is this possible with AJAX/Javascript? If so, could someone point me in the right direction? Would really appreciate any help on this script, been Googling for hours now! :( Cheers Kieran

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• Rewrite rule index.php?/controller/method/param to /controller/method/param

  - by streetparade

  I need a rewrite rule for this url http://localhost/~user/frame/lib/index.php?/controller/method/12/22/ How can i rewrite it that i can call it like this http://localhost/~user/frame/lib/controller/method/12/22/ What is the rewrite rule for the above problem? I hope i could explain my question clear.

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• Does C# support inner classes? [closed]

  - by Amy

  Possible Duplicates: Using Inner classes in C# Inner classes in C# Class declared inside of another class in C# Does C# support the concept of inner classes? If so, what are the benefits? Could someone please explain this to me?

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• What is M language ?

  - by Praveen

  Hi All, Microsoft has M language. Can someone explain the use of M, why it is useful and what a programmer of C# can benifit from M.

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• C: do {...} while(0)?

  - by igul222

  I'm working on some C code filled with macros like this: #define SAFE_FREE(x) do { if ((x) != NULL) {free(x); x=NULL;} } while(0) Can anyone explain what this macro does, and why do {} while(0) is needed? Wouldn't that just execute the code once?

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• What does this eclipse symbol mean?

  - by ikky

  Hi, i can't seem to find this symbol in the Eclipse documentation, and i'm no expert in using Eclipse. Can anyone explain to me what it means? The symbol: It's the arrow that confuses me. Can it be a shared resource? Thanks in advance!

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• Query to find tables modified in the last hour

  - by oalo

  I want to find out which tables have been modified in the last hour in a MySQL database. How can I do this? I am new to MySQL so please try to explain it as simply as you can. thank you!

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• Is Odersky serious with "bills !*&^%~ code!" ?

  - by stacker

  In his book programming in scala (Chapter 5 Section 5.9 Pg 93) Odersky mentioned this expression "bills !*&^%~ code! In the footnote on same page: "By now you should be able to figure out that given this code,the Scala compiler would invoke (bills.!*&^%~(code)).!()." That's a bit to cryptic for me, could someone explain what's going on here?

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• Strange UPDATE syntax in MS Access 2003

  - by Sven

  Hi, I've got an Access application with an update query with the following syntax: UPDATE TABLE1, TABLE2 SET TABLE2.VALUE1 = TABLE1.VALUE1, TABLE2.VALUE2 = TABLE1.VALUE2, TABLE2.VALUE3 = TABLE1.VALUE3, TABLE2.VALUE4 = TABLE1.VALUE4 The query is working but I do not understand what's going on here. I'm trying to convert this query to SQL Server. Can somebody please explain what this query does? My guess is that it's a special Access syntax. Thanks, Sven

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• iPhone "touchesBegan" and "touchesMoved" message ... do not move to centre of touch

  - by Nippysaurus

  I am modifying the "MoveMe" example from the apple web site. When I get the "touchesMoved" message I move the centre of the target view to the centre of the touch. Is there a way that when the touch starts ("touchesBegan" message) I can remember the offset from the target view and keep that offset. Let me know if this is hard to understand and I will try to explain it a bit better.

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