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• freeing a memory twice

  - by benjamin button

  Hi, AFAIAK, freeing a NULL will result in nothing.i mean nothing is being done by the compiler/no functionality is performed. Still i do see some statements where people say that one of the scenario,where a memory corruption can occur is "freeing a memory twice"? Is this still true?

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• Java overloading and overriding

  - by Padmanabh

  We always say that method overloading is static polymorphism and overriding is runtime polymorphism. What exactly do we mean by static here? Is the call to a method resolved on compiling the code? So whats the difference between normal method call and calling a final method? Which one is linked at compile time?

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• How to retrieve query string value from URL value stored in a variable?

  - by user187580

  Hello, $url = 'http://www.domain.com/file.php?dir=r&hl=100,200&ord=3&key=a+b+c'; If it were a url I could get value of hl by, say, $_GET['hl']. but how do I retrieve the same from $url string. Thanks.

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• Taking MySql backup from my Java application

  - by dhiraj

  I am developing a Java application with MySql as the database. I have to dump the MySql database from my application periodically(let say every day at 10 a.m.) and I have written a batch (.bat) file for dumping the database. The batch file is working fine, but the problem is that it is asking for password each time during its execution. Is there any way to dump MySql database without prompting for password and achieve it from Java application periodically?

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• Are there any (somewhat) advanced mathematics Javascript libraries?

  - by pr1001

  Are there any libraries knocking around that provide any additional general purpose math functions for Javascript? Say things like sums over a range, derivatives, integrals, etc. I can imagine that many things aren't possible, so even libraries that do rough approximations would be interesting. Thanks!

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• length of dropdown list

  - by sushant

  i have a drop down list in my form. it contains a lot of values. so when i click on it, it covers whole of the page, along with the scroll bar. is there a way to limit the length of the drop down list, say showing only 10 values at a time. any help is very much appreciated

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• Calling a getter multiple times or calling once and assigning to a variable?

  - by GK

  say suppose I have class as : public class Age { private int age; public int getAge() { return this.age; } } In my Main class I am calling the getAge() method many times. So I wanted to know is it advisable to call so many times or call once and assign it to some variable and use that variable. Which is best and why?

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• howto create a new Date() in Javascript from a non-standard date format

  - by Michel

  hi, i have a date in this format : dd.mm.yyyy when i instantiate a javascript date with it, it gives me a NaN in c# i can specify a dateformat, to say: here you have my string, it's in this format, please make a Datetime of it. is this possible in javascript too, and if not, is there an easy way? i would prefer not to use a substring for day, substring for month etc. because my method must also be capable of german, italian, english etc dates.

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• Getting a substring in Ruby by x number of chars

  - by wotaskd

  I'm trying to produce some Ruby code that will take a string and return a new one, with a number x number of characters removed from its end - these can be actual letters, numbers, spaces etc. Ex: given the following string a_string = "a1wer4zx" I need a simple way to get the same string, minus - say - the 3 last digits. In the case above, that would be "a1wer". The way I'm doing it right now seems very convoluted: an_array = a_string.split(//,(a_string.length-2)) an_array.pop new_string = an_array.join Any ideas?

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• Which are the most noteable things which make working with Core Date so different than with MySQL?

  - by mystify

  One thing I have in mind is, that datasets in Core Data (or lets say: managed objects) have no ID like known from other databases such as MySQL. Also, they're not in a specific guaranteed order. What else makes Core Data much more "special" compared to working with a relational database like MySQL? Besides the whole object graph persisting and ORM stuff?

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• How to display categories correctly using php & mySQL?

  - by SAD

  Lets say I'm starting a site that users can enter content but all my categories are empty except one or two, how should the empty categories be displayed to my users if at all using MySQL & PHP?

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• Jump to the start of next statement

  - by Borek

  Say that I'm writing a test and my caret is here (indicated by "|"): [ExpectedException(typeof(InvalidOperationException|))] In Visual Studio 2010, I'd like to press some shortcut that would take me to the next line so that I could start typing "public void Etc()". Right now, I need to press Right arrow Right arrow Right arrow Enter Which is too many key presses IMO. Is there a VS2010 / ReSharper shortcut to aid this operation?

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• Parsing a dictionary or list from a string in Python

  - by disconeckted

  What is the most straightforward way of making dictionary or list from a string in Python? Let's say I have string "{ 'x' : 3, 'y' : 4 }" and I want to parse it to a real dictionary object.

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• Will RIA Services SL Client Library and Tooling work agains ADO.NET Data Service / OData ?

  - by Rob

  At MIX it was announced that WCF RIA Services supports OData Endpoint on the server now. But is there a good way to use a real OData Server in the WCF RIA Services Tooling as an endpoint or is that just an option for the team to say that are supporting the standard, too?

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• Integer array in Pythn

  - by Ra'ed

  how I can define array of integer numbers in Python code Say if this code is ok. or no pos = [int] len=99 for i in range (0,99): pos[i]=7

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• Autopruning after a specified amount of row are created?

  - by Rob

  Basic question, sorry. Basically, I have a script that creates a MySQL entry each time someone visits the page. A logging script. However, I want to make it autoprune after, say, 100 visits. For example in pseudo code: if amount of rows > 100 { delete rows 1+ until amount of rows == 100 } So in a nutshell, each time a new row is added after 100, it needs to automatically remove the row with the smallest id (My primary key).

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• JPA tutorials

  - by yoitsfrancis

  Let's say that I'm new to JPA, is there a way to get my skills up to speed? Are there any good tutorials?

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• please help me to choose good books on algorithms [closed]

  - by davit-datuashvili

  Possible Duplicate: What is the best book for learning about Algorithms? i want to help me to choose good books on algorithms many people from this site say me that show me your code and now i ask u to help me to choose good books on algorithms please i have not books on algorithms and in case i decide to buy it of course must buy book which has high quality yes? so please any ideas ?links everything

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• why can't I call methods on a for-yield expression?

  - by 1984isnotamanual

  Say I have some scala code like this: // outputs 1, 4, 9, 16, 25, 36, 49, 64, 81, 100 println( squares ) def squares = { val s = for ( count <- 1 to 10 ) yield { count * count } s.mkString(", "); } Why do I have to use the temporary val s? I tried this: def squares = for ( count <- 1 to 10 ) yield { count * count }.mkString(", ") That fails to compile with this error message: error: value mkString is not a member of Int def squares = for ( count <- 1 to 10 ) yield { count * count }.mkString(", ") Shouldn't mkString be called on the collection returned by the for loop?

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• Preventing alert to show two popups when button is clicked twice

  - by Nadeem

  Lets say we have a js function which shows a pop up on a button click. But if the button is clicked twice in a hurry it show two popups. Is there any way to prevent alert to show two pop ups when the button is clicked twice in a hurry?

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• How to get the path of a running jar file?

  - by Morgaelyn

  My code runs inside a jar file, say foo.jar, and I need to know, in the code, in which folder the running foo.jar is. So, if foo.jar is in C:\FOO\, I want to get that path no matter what my current working directory is.

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• Adding php script to cron

  - by shyam

  What should be given as the url to the script while adding it to cron scheduler. The script is at, say, domain.com/scripts/script.php or /public_html/scripts/script.php PS:I am using cPanel

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• IPhone geo tagging data (SQLite or CoreData)

  - by user267980

  Hi. I'm about to build an app that has a database of places that has a location (lon/lat) and i'm about to build the dataModel. Actualy the app is very simple and all i want is to be able to fetch all places around the user (say in a radius of 30miles). Is it better to user SQLite (is there any geo-spatial extension out there)? I'll have around 5000 places in the database and i'm wondering where i can ask a database without affecting performances.

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• Get last/newly added element in std::set

  - by Dave17

  can you get the last or newly added element in std::set? for example say if the loop runs to collect the elements to fill in the std::set. if on the first run the set was, [0] "A" [1] "B" [2] "D" and, on second run, the set becomes [0] "A" [1] "B" [2] "C" [3] "D" How would you check if 'C' is the new element that was added?

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• Firebird 2.1 + EXISTS = query bug?

  - by Atlas

  Using Delphi 2009 + Firebird 2.1.3. Database is ODS 11.1, default char set is UTF8. My prepared query is as follows: SELECT a.po_id, a.po_no FROM purchase_order a WHERE EXISTS (SELECT 1 FROM sales_order_item z1 JOIN purchase_order_item z2 ON z2.so_item_id = z1.so_item_id AND z2.po_id = a.po_id WHERE z1.so_id = :soid) ORDER BY a.po_no Now when I loop this say 1000 times because I have 1000 x so_id, the CPU usage get at 100% for FBSERVER.EXE Anyone encountered this problem?

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