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• best algorithm for swapping?

  - by ashish yadav

  i have heard from a friend of mine that the best algorithm for swapping is " (a^=b^=a^=b)" where a and b are two integers to be swapped. but when i applied this using c language it resulted in crashing. can anyone of you fine people explain the possible reason for that? please suggest the best algorithm for swapping. thank you!!!!

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• Rails - Using checkboxes to select multiple objects and having a choice of actions to perform.

  - by adam

  Id like to be able to create checkboxes for a list of objects. Then offer the user a number of actions to perform on the objects selected. I.e. delete, archive etc. I know of ryan's screencasts but it doesnt explain how to create links to multiple actions for the selected objects. It just showed him create a form_tag with a url to one action and a submit button.

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• Sql query Error: Operand should contain 1 column(s) in rails

  - by dombesz

  Hi everyone, SELECT * FROM jobs WHERE (SELECT DISTINCT jobs.* FROM jobs, job_requests WHERE (jobs.user_id = 1) OR (job_requests.user_id = 1 AND job_requests.job_id = jobs.id)) This sql gives me Mysql::Error: Operand should contain 1 column(s). If i execute the select from the where clause it works SELECT DISTINCT jobs.* FROM jobs, job_requests WHERE (jobs.user_id = 1) OR (job_requests.user_id = 1 AND job_requests.job_id = jobs.id) Could somebody explain me why? This query is generated by rails activerecord so the main select is needed.

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• NHunspell Spell

  - by mouthpiec

  Hi, Can someone explain the letters after the '/' mean? The example below show an extract of the dictionary accessory/SM access/SDMG accidence/M accidentalness/M accidental/SPY accident/MS acclaimer/M acclaim/SDRG acclamation/MS acclimate/XSDGN acclimation/M acclimatisation

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• How to resolve “Unit JclCompression was compiled with a different version of sevenzip.IOutArchive”?

  - by John

  Hello, There is already a similar question(link).The thing is I don't understand what unit I have to delete. I have installed the latest JCL library and added 'JclCompression' to the uses list in a unit and I get the error: "Unit JclCompression was compiled with a different version of sevenzip.IOutArchive". Please explain to me in a simpler way how to resolve the problem. Thanks in advance!

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• How is the angle bracket character, ">" used in CSS?

  - by Sam152

  I have seen this character a number of times in CSS files but I have no idea how its used. Can anyone explain it to me and show how they are useful in making a page style easier?

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• What determines your version numbering conventions in your s/w releases ?

  - by giulio

  I use the classic vX.x format. Beta testing gets a version number like v0.5b. When I go live, I'll say v1.0. I have seen the X.X.X format. Can someone explain the principles behind that convention please. What rules do you use that determine the version of your applications ? And which one do you prefer ?

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• Interview Q: find angle between hour and minute hands in an analog clock

  - by polygenelubricants

  I was given this interview question recently: An analog clock shows that the current time is HH:MM. Compute in degree, the smaller angle between the hour and minute hands. Be as precise as you can. I'm wondering what's the simplest, most readable, most precise algorithm is. Solution in any language is welcome (but do explain it a bit if you think it's necessary).

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• Rails (pagination and tags)

  - by Vitaly

  Hey, I stumbled upon a problem of how to mix both acts_as_taggable (on steroids) and will_paginate gems. What I found on this problem is this: http://www.mckinneystation.com/2007/08/20/pagination-with-acts_as_taggable_on_steroids-acts_as_ferret-and-will_paginate/ But it's dated of 2007, may be there's something more recent? And also could you explain in details what should I do to make that fix work?

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• macro function for printing

  - by seven

  Hi, if for example i have : define PRINT(x) fprintf(stderr, x); and in code i append it : PRINT(("print this")) output is : [print this] if i append it : PRINT(("print %s", "this")) output is : [this] could someone explain me why it receives just the "this" argument and not the whole string ?

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• printing stl containers with gdb 7.0

  - by Andrei

  I have installed GDB 7.0 and python per the following instructions. In the same manual, there is a mention of this file stl-views-1.0.3.gdb. What confuses me, is where should it be placed in order to enable pretty printing of stl containers. Would someone also explain to me all of this work? Thanks

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• Thread runs only once

  - by folone

  When a Thread is finished, you cannot run it once more, using start() method: it throws an Exception. Could anyone explain, why? What stands behind such an architectural decision?

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• Top stories in RSS reader

  - by Gautam

  How do you know what are the top stories or hot topics just in RSS feed aggregator NewsNow for example?? Could you please explain? I am new to Ruby on Rails. I want to build a RSS reader in Ruby on Rails. Could you suggest me some good tutorials or links?? Thanks Gautam

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• Displaying a list of objects with Views - Drupal

  - by RadiantHex

  Hi folks, I'll briefly explain what I'm trying to do: I need to sort a set of content-types within a paginated page. Also I need to add filtering to the page, for example each content-type should have a set of tags and the filter needs to filter through these tags. This is a basic mockup of what this page consists of: I'm finding it quite hard figuring out the best way to do it, and if this can be done. Help would be very much appreciated!!

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• I created a Python egg; now what?

  - by froadie

  I've finally figured out how to create a Python egg and gotten it to work. What do I do with it now? How do I use it? How do I ensure that everything was correctly included? (Simple steps please... not just redirection to another site. I've googled, but it's confusing me, and I was hoping someone could explain it in a couple of simple bullet points or sentences.)

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• Find substring ignoring specified characters

  - by Fredy Treboux

  Hello, please, does any of you knows and can share an easy/clean way to find a substring within a string, but ignoring some specified characters to find it. I think an example would explain things better: string: "Hello, -this- is a string" substring to find: "Hello this" chars to ignore: "," and "-" found the substring, result: "Hello, -this" Using Regex it's not a requirement for me, just added the tag because it feels related.

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• php regex - replace on "\${1}"

  - by Qiao

  found this regex: insert " " every 10 characters: $text = preg_replace("|(.{10})|u", "\${1}"." ", $text); can you, please, explain what \${1} means. Why using \ and what curly brackets means?

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• php: save me from dissapointment

  - by Syom

  i'm being dissapointed in programming when some issues can't be placed in my mind. i have file, which starts <?php session_start();?>, and it returns an error Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at C:\xampp2\htdocs\index.php:1) in C:\xampp2\htdocs\index.php on line 3 and now take a look at the moment, i can't anderstand anyway when i copy the all content of my file into another file, it start working. can somebody explain how can it happen. thanks

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• Can I add a UIView as a start UIview before the navigation based app?

  - by irene-19891023

  Hi, I am a novice in iphone sdk. Now I have already built a Navigation based app. But, I want to add a start UIview with some buttons before the table view of the Navigation based app. How can I do? Could you please explain it in detail? Thanks a lot

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• using FUNCTION instead of CREATE FUNCTION oracle pl/sql

  - by sqlgrasshopper5

  I see people writing a function with FUNCTION instead "CREATE FUNCTION". When I saw this usage in the web I thought it was a typo or something. But in Oreilly's "Oracle 11g PL/SQL Programming" by Steven Feurenstein, the author had used the same thing. But I get errors when I execute that. Could somebody explain is it legal usage or not?. Thanks.

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• Can somebody suggest good learning source of IMS?

  - by Raja Reddy

  I would like to learn working with IMS, can somebody suggest me a good source? I'm not sure if it matters to say that I have quite good exposure and experience with INSYNC DB2 and QMF. So anything that can depict and explain the advantages and disadvantages over IMS would be really helpful. Thanks for your help beforehand..

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• Practical usings of "internal" keyword in C#

  - by Alexander Prokofyev

  Would you explain, please, what are practical usings of "internal" keyword in C#? I know what "internal" modifier limits access to the current assembly. But when could I need it? Thanks!

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• Information on Hook Constants

  - by dsaccount1

  Anyone can explain what these hooks do? Especially WH_MIN and WH_MAX. http://msdn.microsoft.com/en-us/library/ms644959(VS.85).aspx WH_MIN = -1 WH_MSGFILTER = -1 WH_JOURNALRECORD = 0 WH_JOURNALPLAYBACK = 1 WH_KEYBOARD = 2 WH_GETMESSAGE = 3 WH_CALLWNDPROC = 4 WH_CBT = 5 WH_SYSMSGFILTER = 6 WH_MOUSE = 7 WH_HARDWARE = 8 WH_DEBUG = 9 WH_SHELL = 10 WH_FOREGROUNDIDLE = 11 WH_CALLWNDPROCRET = 12 WH_KEYBOARD_LL = 13 WH_MOUSE_LL = 14 WH_MAX = 15

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• Oracle : Identifying duplicates in a table without index

  - by user288031

  When I try to create a unique index on a large table, I get a unique contraint error. The unique index in this case is a composite key of 4 columns. Is there an efficient way to identify the duplicates other than : select col1, col2, col3, col4, count() from Table1 group by col1, col2, col3, col4 having count() 1 The explain plan above shows full table scan with extremely high cost, and just want to find if there is another way. Thanks !

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• use of system.exit(0)

  - by Warrior

  public class WrapperTest { static { print(10); } static void print(int x) { System.out.println(x); System.exit(0); } } In the above code System.exit(0) is used to stop the program. What argument does that method take? Why do we gave it as 0. Can anyone explain the concept?Thanks.

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