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• Help me to get my head around finding cycle start node in cycle linked list?

  - by Passionate programmer

  I understand that Tortoise and Hare's meeting concludes the existence of loop, but how does moving tortoise to beginning of linked list while keeping the hare at meeting place, followed by moving both one step at a time make them meet at starting point of cycle?

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• How do I define a foreign key that points to a class of a different name in ActiveRecord with Rails?

  - by Mark

  Hi there, I have a model Follow that defines a user_id and a followed_user_id. If you've used Twitter, this should make sense. I'm trying to make followed_user_id point to a User model, so I can access the user that is being followed through f.followed_user (in the same way that if I have an Entry with belongs_to :user and a user_id column I can use entry.user to get the user.) How can I do this? Thanks!

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• Can I set a timeout for a InputStream's read() function?

  - by Zombies

  I have a DataInputStream that I obtained from a Socket. Is there any way I can set a timeout for dis.read(...)? Currently I spawn a new thread to do the read. While the parent thread does a thread.join(timeout) to wait before interrupting it. I am aware of nio, but I don't think I want to refactor that much at this point. Thanks.

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• doubt regarding sequence points

  - by tushar

  i recently came across a question about sequence points in c++ at this site what the code will output: int c=0; cout<<c++<<c; it was answered that the output is undefined and << is not a sequence point but still i want to know why does it that even if i compile it 25 times it still prints 01

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• Web Service SOAP Message Routing

  - by anon

  I have a case where i need to route a Web Service SOAP message through an intermediary server. Can anyone point me in the direction of some good resources on how to accomplish this?

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• Is ASP.NET MVC 2 Bin-deployable?

  - by Nevada

  I know that ASP.NET MVC 1.0 is bin-deployable as explained in Phil Haack's article. Is ASP.NET MVC 2.0 also bin-deployable? Has anyone done this already that can point out potential pitfalls specific to version 2.0 if there are any? I would like to deploy a relatively simple ASP.NET MVC 2.0 onto a Windows 2008 Web server that does not have ASP.NET MVC 2.0 installed. It is running .NET Framework 3.5 Service Pack 1. Thanks!

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• the "new" operator in c++, pointer question

  - by Crystal

  Dumb question, but whenever you call new, do you always have a pointer? SomeClass *person = new SomeClass(); And is that because you need a pointer to point to that new space of memory that was allocated for the SomeClass variable person? Thanks!

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• graphing amplitude

  - by John

  I was wondering if someone could point me to a good tutorial or show me how to graph the amplitude from a bytearray. The audio format I am using is: ULAW 8000.0 Hz, 8 bit, mono, 1 bytes/frame.

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• I really need help with Delphi... text files and arrays with sorting?

  - by DTB

  I have read a text file (of names) into an array and I need how to sort those names into alphabetical order and display that in a rich edit? Please give me the code from this point onwards: readln(myfile,arr[i]); 'myfile' is the text file and 'arr' is the array of string. Also, I have declared 'i' as an integer even though it is a array of string. Is that OK?

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• Implementing Custom Data Structures Using Clojure Protocols

  - by Hamza Yerlikaya

  I may have missed the whole point about protocols but my question is, can protocol be used to say iterate a custom data structure or how println would print the object?

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• Using macro to check null values

  - by poliron

  My C code contains many functions with pointers to different structs as parameters which shouldn't be NULL pointers. To make my code more readable, I decided to replace this code: if(arg1==NULL || arg2==NULL || arg3==NULL...) { return SOME_ERROR; } With that macro: NULL_CHECK(arg1,arg2,...) How should I write it, if the number of args is unknown and they can point to different structs?(I work in C99)

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• Is there a programmatic way to determine whether the file is being used?

  - by AngryHacker

  Case and point: I need to open an Excel file via Interop and it would help a lot to avoid ugly COM errors if I knew that the file was in use. Other than trying to open the file and catching the exception, is there a programmatic way to determine whether the file is in use?

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• Free UI tools for Cappuccino?

  - by avp

  Hi, I'm looking for free tools to design the UI for my web app. I'm pretty new to this field, so please point me to acceptable solutions. Basically, I need to fill a "screen" with some controls, that's it. Thanks. EDIT: Well, as soon as nobody answers, maybe somebody can help me with this problem for some framework other than Cappuccino?

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• CS Majors: Hardest concept(s) you learned in school?

  - by Mark Lubin

  For the CS majors out there what were the hardest CS classes or concepts that you learned in your undergraduate schooling? Did you find once you learned the basics,(data structs, OOP fundamentals, discrete math, pointers, recursion, etc) the rest followed naturally or did you hit a wall at any point in your higher classes like OS'es and Compilers? Thanks for the input!

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• c#: can you use a boolean predicate as the parameter to an if statement?

  - by Craig Johnston

  In C#, can you use a boolean predicate on its own as the parameter for an if statement? eg: string str = "HELLO"; if (str.Equals("HELLO")) { Console.WriteLine("HELLO"); } Will this code output "HELLO", or does it need to be: string str = "HELLO"; if (str.Equals("HELLO") == true) { Console.WriteLine("HELLO"); } If there is anything else wrong with the above code segments, please point it out.

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• Cryptic C++ "thing" (function pointer)

  - by m00st

  What is this syntax for in C++? Can someone point me to the technical term so I can see if I find anything in my text? At first I thought it was a prototype but then the = and (*fn) threw me off... Here is my example: void (*fn) (int&,int&) = x;

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• Cannot run the Map Example

  - by Tsimmi

  Hi! I'm trying to run the google maps example but it keep giving me in the console: "WARNING: Application does not specify an API level requirement!" "Device API version is 7 (Android 2.1)" The application never starts, instead, it shows that frame with: "The application (...) has stopped unexpectedly..." Can Anyone point what might be the the problem? Thanks

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• Run GTK+ application in client browser

  - by mgray

  Hi, I've been searching for ways to run a GTK+ application on a browser. WebKit and its associated GTK+ port seem to do the opposite - making applications more Web-friendly, but the opposite would also be nice. There seems to have been some activity to realize that for XCode, with Cappuccino and Atlas, that can translate NIB files into CIB files. If anyone can point me in the right direction, I'd really appreciate it! Thanks! mike

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• wchar to char in c++

  - by Chris

  I have a Windows CE console application that's entry point looks like this int _tmain(int argc, _TCHAR* argv[]) I want to check the contents of argv[1] for "-s" convert argv[2] into an integer. I am having trouble narrowing the arguments or accessing them to test. I initially tried the following with little success if (argv[1] == L"-s") I also tried using the narrow function of wostringstream on each character but this crashed the application. Can anyone shed some light? Thanks

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• Eclipse/PyDev + Django debug

  - by dynback.com

  Eclipse/PyDev, Python 2.6, Django 1.1 All is working in run mode. If I put debug point inside manage.py file, breakpoint worked. But when I putted it in any action method, it causes nothing :(

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• PHP Magento templates

  - by yoda

  Hi, Can anyone point me out a simple and fairly understandable tutorial (or more) regarding template building for Magento E-Commerce? Thanks!

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• Split a string by two characters

  - by David

  Hi, Firstable i want to match if a string has the following format: $abc #xyz or $abc .xyz. The abc and xyz mean only alphanumeric string. If it's matched then i need to extract the first $abc and the last #xyz, all that using pure javascript and maybe regex. The pattern is in the following order: Dollar Sign Unlimited alphanumeric string space a hash or point Unlimited alphanumeric string Thanks in advance for any help.

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• Automatically download files in Ruby

  - by Obinna

  I'm trying to write a ruby script which automatically downloads some files from some server ever 30-45 minutes (to prevent overload) as long as my computer is turned on. It's possible that my computer might be turned off at some point, but the download should resume (probably re-download the current file). I already have the file list but I can't figure out how to make such a script to run autonomously. What are some ways I can do this?

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• Sorting a 2 dimensional array on multiple columns

  - by Anon

  I need to sort a 2 dimensional array of doubles on multiple columns using either C or C++. Could someone point me to the algorithm that I should use or an existing library (perhaps boost?) that has this functionality? I have a feeling that writing a recursive function may be the way to go but I am too lazy to write out the algorithm or implement it myself if it has been done elsewhere. :-) Thanks

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• Code to extrude 2d geometry to 3d

  - by Bgnt44

  Hi, is there any simple way to extrude a 2d geomtry (vectors ) to a 3d shape assuming extruding parameter are lenght (double) and angle (degree) so it should render like a cone ( all z lines going to one point )

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