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• How many additional function calls does fib(n) require if "LINE 3" is removed?

  - by BROCK

  I just got this question on a interview and had no idea how to calculate the answer. How many additional function calls does fib(n) require if "LINE 3" is removed? The answer should be in terms on n. int fib(int n) { if(n == 0) return 0; if(n == 1) return 1; if(n == 2) return 1; //LINE 3 HERE <--- return fib(n - 1) + fib(n - 2); }

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• How to properly define hash function for a list of objects?

  - by AnSGri

  I have a data structure containing a list of objects, like this: class A { private List<Object> list; } How to properly define a hash function for the list, assuming each element of the list has correct hashCode()? (It's strange that I couldn't easily find the solution via Google.)

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• Why does this anonymous function starting with println result in a NullPointerException?

  - by noahz

  I am learning about pmap and wrote the following function: (pmap #((println "hello from " (-> (Thread/currentThread) .getName)) (+ %1 %2)) [1 1 1] [-1 -1 -1]) When run, the result is a NullPointerException (hello from clojure-agent-send-off-pool-4 hello from clojure-agent-send-off-pool-3 hello from clojure-agent-send-off-pool-5 NullPointerException user/eval55/fn--56 (NO_SOURCE_FILE:11) Why is this happening? I have understood and observed the body of a fn to be an implicit do.

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• How can I retrieve all the returned variables from a function?

  - by user1447941

  import random def some_function(): example = random.randint(0, 1) if example == 1: other_example = 2 else: return False return example, other_example With this example, there is a chance that either one or two variables will be returned. Usually, for one variable I'd use var = some_function() while for two, var, var2 = some_function(). How can I tell how many variables are being returned by the function?

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• 1-which is the parameter that is added to every non-static member function when it is called?

  - by user308387

  1-which is the parameter that is added to every non-static member function when it is called? 2-what is an adaptor class or wrapper class? 3-what is a non object when can you tell that a memory leak will occur? 4-what is a parameterized type?

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• how to store hour and minute in database table while using mktime() function?

  - by Learner Miz

  I am using a form to get the hour and minute using post method and then store it to mysql DB. Such as : $hour = $_POST['hour']; $minute = $_POST['minute']; ** There is no need of date, month and year. I just need to store the hour and minute in a column of a table (ex: exam_time) Column structure: exam_time time NOT NULL Now how to store these value into database using mktime() function. I tried but it stores 00:00:00, not the one which I am sending via form.

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• if a controller action redirects to external url, what do you return in the function?

  - by oo

  i have a function and i am unclear what i should return from this? public ActionResult LoadExternalURL() { Response.Redirect("http://www.google.com"); // what do i return here ?? }

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• Where can I find documentation for Scala's delayed function calls?

  - by Geo

  I saw a delayed example in David Pollak's "Beginning Scala". I tried to adapt that, by trial and error. Here's what I have: def sayhello() = { println("hello") } def delaying(t: => Unit):Unit = { println("before call") t println("after call") } delaying(sayhello()) How would you delay a function/method that takes parameters? Why can't I use parantheses when I call t? Where can I find more documentation on delaying functions?

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• Possible to call single-parameter Python function without using parentheses?

  - by Jen

  The Python documentation specifies that is is legal to omit the parentheses if a function only takes a single parameter, but myfunction "Hello!" generates a syntax error. So, what's the deal? (I'm using Python 3.1)

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• Could I find the function invoked by an event in run-time?

  - by Paul

  I want to find that when a user fires an event, such as click a button, what function(s) does this event invoke in run-time? Would it be possible? Thanks!

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• How do I assign an alias to a function name in C++?

  - by Vulcan Eager

  It's easy to create a new name for a type, a variable or a namespace. But how do I assign a new name to a function? For example, I want to use the name holler for printf. #define is obvious... any other way? Solutions: #define holler printf ...

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• In Javascript, when is a new scope created? (with a new function and in a "with" statement) Are the

  - by Jian Lin

  In Javascript, when is a new scope created? The 2 situations I know of are: with a new function in a "with" statement as a note, any new block (in if-then-else, loops, or just beginning a block for no other reason) won't create a new scope. Is there a third situation where a new scope is created besides the two situations above? Thanks.

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• Why is ColdFusion adding whitespace when I put the output of a function in a string?

  - by Kip

  If I do something like this in ColdFusion: <cfoutput>foo="#foo()#"</cfoutput> The resulting HTML has a space in front of it: foo=" BAR" However, if it is not a function call it works fine, i.e.: <cfset fooOut=foo() /> <cfoutput>foo="#fooOut#"</cfoutput> Gives this output: foo="BAR" Where is this extra space coming from and is there anything I can do about it?

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• Does Doctrine 1.2 support importing indexes with Doctrine_Core::generateModelsFromDb function?

  - by Coagulant

  Does Doctrine 1.2 support importing indexes with Doctrine_Core::generateModelsFromDb() function? I need to make a migration between 2 database connections, one of them having unique index on 2 fields and one doesn't. And my migration is empty. It looks like Doctrine doesn't support indexes when importing from databae, other than those tied to relationship foreign keys. $changes = Doctrine_Core::generateMigrationsFromDiff($migrationsPath, array('doctrineOld'), array('doctrine'));

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• Python: set a function timeout without using signal or threads?

  - by Heinrich Schmetterling

  Is there a way to have a function raise an error if it takes longer than a certain amount of time to return? I want to do this without using signal (because I am not in the main thread) or by spawning more threads, which is cumbersome.

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• Django. Invalid keyword argument for this function. ManyToMany

  - by sagem_tetra

  I have this error: 'people' is an invalid keyword argument for this function class Passage(models.Model): name= models.CharField(max_length = 255) who = models.ForeignKey(UserProfil) class UserPassage(models.Model): passage = models.ForeignKey(Passage) people = models.ManyToManyField(UserProfil, null=True) class UserProfil(models.Model): user = models.OneToOneField(User) name = models.CharField(max_length=50) I try: def join(request): user = request.user user_profil = UserProfil.objects.get(user=user) passage = Passage.objects.get(id=2) #line with error up = UserPassage.objects.create(people= user_profil, passage=passage) return render_to_response('thanks.html') How to do correctly? Thanks!

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• Why would one write global code inside a function definition-call pair?

  - by ssg

  I see examples where JavaScript code including jQuery and jslint use the notation below: (function(){ // do something })(); instead of: // do something I first thought this is just for local scoping, i.e. creating local variables for the code block without polluting global namespace. But I've seen instances without any local variables at all too. What am I missing here?

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• PHP: How to know when exec() function is finish?

  - by skiria

  I have an exec function in php file that execs a bash script. It script calls fmpeg to transcode a video file. How can I know when transcoding is finish?? $script = "/opt/lamp../name.sh" exec("$script $videoIn $id") I will try using next code but it doesn't workd. if (exec("$script $videoIn $id")) { //print on screen that the video has been transcoded }

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• How to sort a Map<Key, Value> on the values in Java with google collections ordering function

  - by chris-gr

  How to sort a map(?,B) on the values in Java with google collections ordering function, if B is a class, which has a field of type double, which should be used for ordering.

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• Why is ColdFusion adding whitespace when I call a function in cfoutput?

  - by Kip

  If I do something like this in ColdFusion: <cfoutput>foo="#foo()#"</cfoutput> The resulting HTML has a space in front of it: foo=" BAR" However, if it is not a function call it works fine, i.e.: <cfset fooOut=foo() /> <cfoutput>foo="#fooOut#"</cfoutput> Gives this output: foo="BAR" Where is this extra space coming from and is there anything I can do about it?

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• How to hook a function for a particular shared ELF library?

  - by iUm

  LD_PRELOAD hooks some functions for the entire process, but I need to hook a particular function for only one dynamically linked library by its name.

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• I need a way to implement the function matches() from XPath 2.0 with functions from XPath 1.0

  - by Jenny Smith

  I have the following piece of code: root="//valueExpression[matches(self::*,'pattern')]/.." But I can only use XPath 1.0 and I get an exception for the function matches(). Can you please help me with a solution using only functions from XPath 1.0 ?

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• [MSBuild] How to convert NAnt function "path::combine(path1, path2)" to MSBuild?

  - by Nam Gi VU

  I need to convert the function "path::combine(path1, path2)". Please help me if you have some idea. Thank you!

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• What does (function( $ ){...})( jQuery ); do/mean?

  - by Derek Adair

  Hi, I am a bit new to reusable plugins for jquery. I have ran across this code several times and can't figure out exactly what is going on. (function( $ ){ ... })( jQuery ); Can any one enlighten me?

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• How can I call javascript function when DIV position is change ?

  - by Jimit

  Hello everyone, I need to call javascript function when div position is changed.how can I achieve that event of changed div position ?. any idea ?

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