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• Math operation in Java

  - by joroj

  Hello, what "^" operator does? when I try this: int a = 5^n; it gives me: for n = 5, returns 0 for n = 4, returns 1 for n = 6, returns 3 What is this?

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• How do you make cin typesafe?

  - by cactusbin

  It is well known that cin is not typesafe (e.g. cin integer; and entering "fifty five" will cause it to flip out). I have seen many not-so-elegant ways to hand this, such as getlining a string and using sstream to convert it to a number, or looping with cin.fail() and clearing the stream and reentering it, etc. Is there any library or anyway to overload the inserter operator to make cin automatically typesafe?

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• LINQ Single vs First

  - by BahaiResearch.com

  LINQ: Is it more efficient to use the Single() operator over First() when ever I know for certain that the query will return a single record? Is there a difference?

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• Filter tweets by client name

  - by Ido Shilon

  I'm trying to filter tweets results by client name like - using source operator. I'm trying to do it with a a client named "single platform" , to get tweets like http://twitter.com/#!/phoenixparknyc/status/43340419475570688 but the search doesn't seems to work (tried with quotes as well) http://twitter.com/#!/search/source%3Asingle%20platform%20Specials%2FEvents%20 Any idea how to make the search works ?

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• [r] Converting unix seconds in milliseconds to POSIXct/POSIXlt

  - by signalseeker

  Why do I see a difference when I convert a unix timestamp to datetime object in R? > as.POSIXlt(1268736919, origin="1970-01-01", tz="America/New_York") [1] "2010-03-16 06:55:19 EDT" > as.POSIXct(1268736919, origin="1970-01-01", tz="America/New_York") [1] "2010-03-16 11:55:19 EDT" The result from POSIXlt is actually correct. Also, is there a way to do this conversion without specifying the origin? Thanks

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• How to associate a file extension to a program without making it the default program

  - by CharlesB

  I'm deploying a small conversion tool on some systems, and want the users to be able to run it from the right click Open with menu. But I don't want to change the default program users have associated to this file type. It is easy to associate a file extension/type to a program, but how to do it without changing the default program?

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• Why do we need to use ConvertBack in IValue Converter

  - by Subhen

  Hi, I am not sure Why we need to use I ConvertBack method in IValueConverter. In the Convert method itself we do the conversion and return the updated value to be bound in our control. So in which Scenario we should use Convertback. I know this question is very basic but just wanted to make the fundamentals clear. Thanks a lot for your help and suggestions. Thanks, Subhen

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• Using PyUNO on Windows and CentOS

  - by Karim

  Is there any way to use OpenOffice's PyUNO without using the version of Python that comes with OpenOffice? I mean, can I install a package (on Windows and CentOS) that uses the version of Python that's already on the server? I'm trying to use OpenOffice in headless mode so that I can do document conversion with a script (ultimately on a hosted server running CentOS) but my development work is being done on Windows and occassionally the Mac). I'm having nothing but trouble getting this to work.

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• How to implement == or >= operators for generic type

  - by momsd

  I have a generic type Foo which has a internal generic class Boo. Boo class a property Value of type K. In a method inside Foo i want to do a boo.Value >= value Note that second operand value is of type T. while compiling i am getting following error: Operator '=' cannot be applied to operands of type 'T' and 'T' Can anyone please tell me whats the problem here?

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• Is there a way to combine IN and LIKE in MySQL?

  - by abeger

  I'm currently running a query like this: SELECT * FROM email WHERE email_address LIKE 'ajones@%' OR email_address LIKE 'bsmith@%' OR email_address LIKE 'cjohnson@%' The large number of OR's bothers me. Is there a way to condense this up with something akin to an IN operator, e.g.: SELECT * FROM email WHERE email_address LIKE ('ajones@%', 'bsmith@%', 'cjohnson@%') Or is this just wishful thinking?

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• What is the best way to open a URL and get up to X bytes in Python?

  - by Stavros Korokithakis

  I want to have a robot fetch a URL every hour, but if the site's operator is malicious he could have his server send me a 1 GB file. Is there a good way to limit downloading to, say, 100 KB and stop after that limit? I can imagine writing my own connection handler from scratch, but I'd like to use urllib2 if at all possible, just specifying the limit somehow. Thanks!

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• Haskell, mongodb, date

  - by r.sendecky

  How would I insert or auto insert date into mongodb from haskell? What is the best way to convert from mongo date type to haskell data type? Say, in a situation where I insert blog post records (any haskell web framework) and I want to date stamp every record automatically. How would I go about it? The question is more about type conversion and mongodb date type creation from within haskell driver.

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• extract/slice/reorder lists in (emacs) lisp?

  - by Stephen

  In python, you might do something like i = (0, 3, 2) x = [x+1 for x in range(0,5)] operator.itemgetter(*i)(x) to get (1, 4, 3). In (emacs) lisp, I wrote this function called extract which does something similar, (defun extract (elems seq) (mapcar (lambda (x) (nth x seq)) elems)) (extract '(0 3 2) (number-sequence 1 5)) but I feel like there should be something built in? All I know is first, last, rest, nth, car, cdr... What's the way to go? ~ Thanks in advance ~

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• K/APL style programming in C++?

  - by anon

  I'm writing code in C++, but I really like K/APL's array-oriented style. Does anyone know of a good set of operator overloading tricks / macros / ... to allow some K/APL -style programming in C++? Thanks!

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• Getting value depedning on two boolean attrinutes.[Nested ifs]

  - by uswaretech

  I have two fields start_time end_time - can be null Now, depending on this I needs to differentiate between three states Scheduled in future, Currently running Completed in past Since mysql IF operator can not be nested, (Or I cant find an easy way to nest them), I cant find how to get the three state status.

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• Size of abstract class

  - by webgenius

  How can I find the size of an abstract class? class A { virtual void PureVirtualFunction() = 0; }; Since this is an abstract class, I can't create objects of this class. How will I be able to find the size of the abstract class A using the 'sizeof' operator?

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• Can one create Sized Types in Scala?

  - by Jens Schauder

  Is it possible to create types like e.g. String(20) in scala? The aim would be to have compiler checks for things like: a: String(20) b: String(30) a = b; // throws a compiler exception when no implicit conversion is available b= a; // works just fine Note: It doesn't need to be/named String

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• Parameterizing a SQL IN clause on an integer column?

  - by SkippyFire

  Jeff Atwood asked the original question about parameterizing a SQL IN clause, but I want to do this with an integer column. If I try the code from the original post I get the following exception, which makes sense: Conversion failed when converting the varchar value '%|' to data type int. Anyone try this before?

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• What's the correct type to use for pointer subtraction on x64?

  - by Cheeso

  I'm just starting out with x64 compilation. I have a couple of char*'s, and I'm subtracting them. With a 32-bit compile, this works: char * p1 = .... char * p3 = ... int delta = p3 - p1; But if I compile for x64 I get a warning: warning C4244: 'initializing' : conversion from '__int64' to 'int', possible loss of data What is the correct type to use, to represent a difference between two pointers, that works in both x86 and x64 compiles?

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• JEXCelAPI on android

  - by user121196

  When I added the JExcelAPI http://jexcelapi.sourceforge.net/ to the class path and run my app, I get: trouble writing output: shouldn't happen [2009-07-16 14:32:19 - xxx] Conversion to Dalvik format failed with error 2 any idea? thanks

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• Why can't I set a nullable int to null in a ternary if statement?

  - by Abe Miessler

  The C# code below: int? i; i = (true ? null : 0); gives me the error: Type of conditional expression cannot be determined because there is no implicit conversion between '' and 'int' Shouldn't this be valid? What am i missing here?

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• Whats the best way to send multiple variables in a query string within a URL

  - by Andy

  I have a client who is wanting to create a link which contains product codes so that his customers hit a page with just those products displayed in an attempt to increase conversion rates from affilliate sites. My question is whats the best way to send these multiple products in a single URL For example: http://www.mydomain.co.uk/bespoke-list.php?catNo=234-324-232-343 Obviously then the site would grab the codes from the string and display them... We're going to be using PHP! Thanks in advance.

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• How can I convert UTM coordinates from Meters to Feet?

  - by Josh

  Does anyone have a formula or conversion that will switch my UTM coordinates from Meters to Feet? I found Javascript code that will convert UTM coords in meters to Lat/Long but I will need my UTM in feet before I convert it to Lat/Long. Thanks,

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• Ado.net entity model problem

  - by ognjenb

  public ActionResult Index() { using (testEntities korisnici = new testEntities()) { my_aspnet_users user = new my_aspnet_users(); user = from i in korisnici.my_aspnet_users select i; return View(user); } } Error: Cannot implicitly convert type 'System.Linq.IQueryable' to 'MyApp.Models.my_aspnet_users'. An explicit conversion exists (are you missing a cast?)

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• How to process this string via regular expression

  - by iiduce

  my string style like this: expression1/field1+expression2*expression3+expression4/field2*expression5*expression6/field3 a real style mybe like this: computer/(100)+web*mail+explorer/(200)*bbs*solution/(300) "+" and "*" represent operator "computer","web"...represent expression (100),(200) represent field num . field num may not exist. I want process the string to this: /(100)+web*+explorer/(200)bbs/(300) rules like this: if expression length is more than 3 and its field is not (200), then add brackets to it.

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