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• Find out 20th, 30th, nth prime number. (I'm getting 20th but not 30th?) [Python]

  - by gsin

  The question is to find the 1000th prime number. I wrote the following python code for this. The problem is, I get the right answer for the 10th , 20th prime but after that each increment of 10 leaves me one off the mark. I can't catch the bug here :( count=1 #to keep count of prime numbers primes=() #tuple to hold primes candidate=3 #variable to test for primes while count<20: for x in range(2,candidate): if candidate%x==0: candidate=candidate+2 else : pass primes=primes+(candidate,) candidate=candidate+2 count=count+1 print primes print "20th prime is ", primes[-1] In case you're wondering, count is initialised as 1 because I am not testing for 2 as a prime number(I'm starting from 3) and candidate is being incremented by 2 because only odd numbers can be prime numbers. I know there are other ways of solving this problem, such as the prime number theorem but I wanna know what's wrong with this approach. Also if there are any optimisations you have in mind, please suggest. Thank You

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• Cursors vs Procedures in SQL

  - by CogitoErgoSum

  So, I just learned about CURSORS but still don't exactly grasp them. What is the difference between a cursor and procedure or even a function? So far from the various examples (DECLARE CURSOR ... SELECT ... FROM ...) It seems at most its a variable to hold a query. Is the data real time, or a snapshot of when the cursor was declared? i.e. I have a table with one row and one col with a value of 2. I do DECLARE CURSOR ... SELECT * FROM table1 I then insert a new row with a value of 3. When I run the cursor, would I Just get the one row from before the cursor was declared, or both rows? Thanks

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• IntPtr arithmetics

  - by Luca

  I tried to allocate an array of structs in this way: struct T { int a; int b; } data = Marshal.AllocHGlobal(count*Marshal.SizeOf(typeof(T)); ... I'd like to access to allocated data "binding" a struct to each element in array allocated with AllocHGlobal... something like this T v; v = (T)Marshal.PtrToStructure(data+1, typeof(T)); but i don't find any convenient way... why IntPtr lack of arithmetics? How can I workaround this is a "safe" way? Someone could confirm that PtrToStructure function copy data into the struct variable? In other words, modifing the struct reflect modifications in the structure array data, or not? Definitely, I want to operate on data pointed by an IntPtr using struct, without copying data each time, avoiding unsafe code. Thank all!

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• Is the JavaScript RegExp implicit method deprecated?

  - by Eric

  So everyone knows what I mean by "implicit methods"? They're like those default properties from the Windows COM days of yore, where you could type something like val = obj(arguments) and it would be interpreted as val = obj.defaultMethod(arguments) I just found out JavaScript has the same thing: the default method of a RegExp object appears to be 'exec', as in /(\w{4})/('yip jump man')[1] ==> jump This even works when the RegExp object is assigned to a variable, and even when it's created with the RegExp constructor, instead of /.../, which is good news to us fans of referential transparency. Where is this documented, and/or is it deprecated?

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• function prototype declarations

  - by sandy101

  I am practice the function in c and come across to the program .... #include<stdio.h> int main() { float a=15.5; char ch ='C'; printit(a,ch); return 0; } printit(a,ch) { printf("%f\n%c",a,ch); } I want to know that why the above program compile and not give the error as i understood so for is ... The function in c must be declared with the specific prototype (but this program does not contain the prototype) why the program give the output 'x'for the char variable ? can the function in c are capable of accepting the value without being declared about type in parameters like what has done in the function declaration ?

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• Access DoCmd.OpenForm Not Working

  - by user961743

  Looking for a second set of eyes to figure out my problem with an Access form filter. I created a search form, when filled in, appends search criteria to a string variable (strQuery) that is put in place to the [WhereCondition] for opening a form. However, when the script is ran, nothing comes up except for a filtered form with no records. Here is the line that opens the form: DoCmd.OpenForm "ADD_NEW_NCMR", , , strQuery Before the line is ran, strQuery equals: 1=1 AND [NCMR].[NCMR_NUM] = '12-129' The form name, and table.column combination are all correct. In fact, using the DCount function returns the result of 1, which is correct for this query, and returns the correct number for other queries as well. This makes me think that there is nothing wrong with the where condition. DCount("[NCMR_NUM]", "NCMR", strQuery)

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• Files written with FileWriter are either 32 KB, 24 KB, 16 KB, ... big or empty

  - by Bernhard V

  Hi, I read a file into a string, change the first line and then write this string into a new file. I do this through the following code (a little bit shortened): while(jspIterator.hasNext()){ String line = (String) jspIterator.next(); if (i == 0) { if (line.startsWith("bla bla") && line.endsWith("yada")) { line = line.replaceFirst("this", "that"); } } jspAsString += line; i++; } FileWriter newJspWriter = new FileWriter(newJspFile); newJspWriter.write(jspAsString); Now the files written this way are either 32, 24, 16, 8 KByte big or completely empty. When debugging I see that the String is assembled correctly. When I print the variable jspAsString to the console it also appears correct. Do you know why FileWriter behaves this way?

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• jQuery: How to fire event when all asynchronous calls return?

  - by Jeremy

  I have a jQuery application that loads data from five asynchronous server calls. I do not want to display any data until all five calls return. (I plan on displaying a Loading message until that happens.) How can I detect when all five calls have returned? I considered having each callback method increment a variable (using jQuery's data() method, perhaps) and then waiting for the value to become 5. (I am not sure yet how I would listen for that event.) I do not think this is a very good solution, however. What would happen if two calls return at the same time? Is there a better way to do this?

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• AJAX works fine in firefox, but malfunctions in Mozilla Prism 0.9

  - by Babiker

  I have the following ajax fucntion: function ajax(value, url, urlVarname, displayContainers_id){ if(value == ''){ document.getElementById(displayContainers_id).innerHTML=''; } /* THIS IS LINE 12*/ xmlhttp = new XMLHttpRequest(); xmlhttp.onreadystatechange=function() { if(xmlhttp.readyState == 4 && xmlhttp.status == 200){ document.getElementById(displayContainers_id).innerHTML=xmlhttp.responseText; } } xmlhttp.open('GET',url + '?varName=' + urlVarname + '&value=' + value, true); /* THIS IS LINE 25 */ xmlhttp.send(); } onmousedown="ajax(document.getElementById('searchParamater').value, 'http://192.168.0.7/controllers/search_controller.php', document.getElementById('searchBy').value, 'ajaxBucket')"> This whole thing works fine in firefox but when i use prism 0.9, it malfunctions and i get the following error in the errors console: Warning: assignment to undeclared variable xmlhttp Source File: http://192.168.0.7/javascript/main.js Line: 12 Error: uncaught exception: [Exception... "Not enough arguments [nsIXMLHttpRequest.send]" nsresult: "0x80570001 (NS_ERROR_XPC_NOT_ENOUGH_ARGS)" location: "JS frame :: http://192.168.0.7/javascript/main.js :: ajax :: line 25" data: no]

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• Using javascript on an HTML table?

  - by Michael McKay

  Hi, few questions, just wondering if anyone can help? I have a table with 1 long row (1000 pixels) and one single column, how do i go about creating a method whereby when the mouse cursor is on the leftmost side of the cell, a variable, lets say X is set to 0, the further right the mouse cursor moves in the cell, the value of X increases. I know that sounds like a strange question but im working on a project where this type of functionality is desired. Is there a javascript method to create this feature? Thanks for any help.

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• dropdowllist selected item from javascript to servlet

  - by kawtousse

  Hi, I am writing to ask if anybody knows, is it possible to get the value from a JavaScript variable and use this value in a Java Servlet? I have read up on this but all i have found is getting the JavaScript value through a form submit. What I need is: I have a html select combo box. I need to extract the selected value from this and use this value to query a database. Is this possible. Thanks in advance.

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• How to prevent certain workflows from showing in SharePoint's Workflow.aspx page for a list.

  - by Burt

  I have a few workflows associated with a SharePoint list (e.g., Pages). Some are written as SharePoint WF workflows in Visual Studio, but some are no-code workflows created in SharePoint Designer. I programmatically start the WF workflows, but the no-code ones are started manually. When a user goes to "/_layouts/Workflow.aspx?ID=&List=&ShowStart=1" they will see all of the workflows. If I set ShowStart variable to 0 they will see none. If I don't allow the WF workflows to be started manually, then they don't seem to start programmatically correctly. Is there a way to allow the WF workflows to be started programmatically, but not manually? I also want the no-code workflows to be able to be started manually when ShowStart=1. Any ideas are welcome.

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• Is there any benefit to declaring a private property with a getter and setter?

  - by AmoebaMan17

  I am reviewing another developer's code and he has written a lot of code for class level variables that is similar to the following: /// <summary> /// how often to check for messages /// </summary> private int CheckForMessagesMilliSeconds { get; set; } /// <summary> /// application path /// </summary> private string AppPath { get; set; } Doesn't coding this way add unnecessary overhead since the variable is private? Am I not considering a situation where this pattern of coding is required for private variables?

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• setting actionscript 3 superclass variables

  - by jedierikb

  In AS3, if I have a class such: public class dude { //default value for a dude protected var _strength:Number = 1; public function dude( ):void { super( ); //todo... calculate abilities of a dude based on his strength. } } and a subclass public class superDude extends dude { public function superDude( ):void { _strength = 100; super( ); trace( "strength of superDude: " + _strength ); } } This will trace strength of superDude is 1. I expected the variable I set in the subclass (prior to calling the superclass constructor) to remain. Is there a way to assign class variables in subclass constructors which are not over-written by the superclass construtor? Or should I pass them up as constructor variables?

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• Is there a better way than #if DebugMode for logging

  - by Daniel

  I'm making a c++ library thats going to be P/Invoked from c#, so i am unable to breakpoint/debug the c++ side of things. So i decided to add logging so i can see if anything goes wrong and where it happens. I add a #define DebugMode 1 in order to determine if i am to log or not. First of all i'm not very good at c++ but i know enough to get around. So my questions are: Is there a better way than wrapping #if DebugMode #endifs around every Log call? I could simply do that inside the method and just return if logging isn't disabled but won't that mean then all those logging strings will be in the assembly? How can i emulate what printf does with its "..." operator enabling me to pass something like Log("Variable x is {0}", x); Thanks!

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• Adding List Array item In A Data Table Using Loop Results Error .. .

  - by Syed Raza

  I am trying to put the list array(res) item in to the Data Table(_Hdt) using for Loop I have put the values in "res" list erray using loop...but this loop results in an error: "variable use asd a method ?" Here _Hdt and dt are data table and res is list array, for (int r = 0; r < _Hdt.Rows.Count; r++) { foreach (DataRow row in dt.Select("DATE='" + _Hdt.Rows[r]["DATE"].ToString().Trim() + "'")) { DateTime date = Convert.ToDateTime(_Hdt.Rows[r]["DATE"].ToString().Trim()); string dateformat = String.Format("{0:dddd MMM d}", date); _Hdt.Rows[r]["DATE"] = dateformat; _Hdt.Rows[r]["MTU"] = row["MTU"].ToString().Trim(); _Hdt.Rows[r]["POWER"] = (Convert.ToDecimal(row["POWER"].ToString().Trim()) / 1000).ToString(); _Hdt.Rows[r]["COST"] = row["COST"].ToString().Trim(); _Hdt.Rows[r]["VOLTAGE"] = row["VOLTAGE"].ToString().Trim(); _Hdt.Rows[r]["KW"] = res(r); } }

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• Read out result of a PageMethod into a jQuery-script

  - by Jan-Frederik Carl

  Hello, I am quite a jQuery novice and try to read out the result of a PageMethod into my jQuery script. I have a ScriptManager installed and the following WebMethod: [WebMethod(EnableSession = true)] public static string CheckSystemDefault(string _id) { int id = Convert.ToInt16(_id); addressTypeRepository = new AddressTypeRepository(); AddressType addressType = addressTypeRepository.GetById(id); if (addressType.IsSystemDefault == true) return "IsSystemDefault"; else return "IsNotSystemDefault"; } I use this to check if an object has the property IsSystemDefault. In the script, I hand over the id from the url and want to evaluate the result: var id = $(document).getUrlParam("id"); var check = PageMethods.CheckSystemDefault(id); if (check == "IsSystemDefault") { ... } if (check == "IsNotSystemDefault") { ... } But as a result, the variable "check" is undefined. What do I have to change?

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• Best way to get an Application Context into a static method in Android

  - by Slapout

  I'm working on an Android application that has several Activities. In it I have a class with several static methods. I would like to be able to call these methods from the different Activities. I'm using the static methods to load data from an xml file via a XmlResourceParser. To create a XmlResourceParser requires a call on the Application Context. So my question is, what is the best way to get a reference to the Application Context into the static methods? Have each Activity get it and pass it in? Store it somehow in a global variable?

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• When exactly does a method have side effects?

  - by Kim

  As I always understood it, any change to the programs state (or anything to do with IO) is a side effect. It does not matter, whether the change occurs in a global variable or in a private field of the object the method is called on. It follows that all methods which do not return anything either do nothing at all or have a side effect. My confusion comes from one of our university's instructors (who is still a student and thus not omniscient yet;) ) telling me setters don't have side effects.

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• How are exceptions allocated on the stack caught beyond their scope?

  - by John Doe

  In the following code, the stack-based variable 'ex' is thrown and caught in a function beyond the scope in which ex was declared. This seems a bit strange to me, since (AFAIK) stack-based variables cannot be used outside the scope in which they were declared (the stack is unwound). void f() { SomeKindOfException ex(...); throw ex; } void g() { try { f(); } catch (SomeKindOfException& ex) { //Handling code... } } I've added a print statement to SomeKindOfException's destructor and it shows that ex is destructed once it goes out of scope in f() but then it's caught in g() and destructed again once it goes out of scope there as well. Any help?

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• What are the characteristics of spaghetti code?

  - by justjoe

  Somebody said that when your PHP Code and application use global variable then it must be a spaghetti code (i assume this). I use wordpress a lot. As far as i know, it's the best thing near a great php software. And it use many global variables to interact between its components. but forget about that, cause frankly, that's the only thing i know. so it's completely biased ;D so just curious, What is the characteristic of spaghetti code ? ps : the only thing i know is wordpress. so, Hopefully, maybe this will help somebody give great answer for somebody who have a little experience on developing full web application on PHP (for example, stack-overflow website)

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• How to replicate this button in CSS

  - by jasondavis

  I am trying to create a CSS theme switcher button like below. The top image shows what I have so far and the bottom image shows what I am trying to create. I am not the best at this stuff I am more of a back-end coder. I could really use some help. I have a live demo of the code here http://dabblet.com/gist/2230656 Just looking at what I have and the goal image, some differences. I need to add a gradient The border is not right on mine Radius is a little off Possibly some other stuff? Also here is the code...it can be changed anyway to improve this, the naming and stuff could be improved I am sure but I can use any help I can get. HTML <div class="switch-wrapper"> <div class="switcher left selected"> <span id="left">....</span> </div> <div class="switcher right"> <span id="right">....</span> </div> </div> CSS /* begin button styles */ .switch-wrapper{ width:400px; margin:220px; } .switcher { background:#507190; display: inline-block; max-width: 100%; box-shadow: 1px 1px 1px rgba(0,0,0,.3); position:relative; } #left, #right{ width:17px; height:11px; overflow:hidden; position:absolute; top:50%; left:50%; margin-top:-5px; margin-left:-8px; font: 0/0 a; } #left{ background-image: url(http://www.codedevelopr.com/assets/images/switcher.png); background-position: 0px px; } #right{ background-image: url(http://www.codedevelopr.com/assets/images/switcher.png); background-position: -0px -19px; } .left, .right{ width: 30px; height: 25px; border: 1px solid #3C5D7E; } .left{ border-radius: 6px 0px 0px 6px; } .right{ border-radius: 0 6px 6px 0; margin: 0 0 0 -6px } .switcher:hover, .selected { background: #27394b; box-shadow: -1px 1px 0px rgba(255,255,255,.4), inset 0 4px 5px rgba(0,0,0,.6), inset 0 1px 2px rgba(0,0,0,.6); }

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• Why is this variables declared as private and also readonly?

  - by Sergio Tapia

  In the following code: public class MovieRepository : IMovieRepository { private readonly IHtmlDownloader _downloader; public MovieRepository(IHtmlDownloader downloader) { _downloader = downloader; } public Movie FindMovieById(string id) { var idUri = ...build URI...; var html = _downloader.DownloadHtml(idUri); return ...parse ID HTML...; } public Movie FindMovieByTitle(string title) { var titleUri = ...build URI...; var html = _downloader.DownloadHtml(titleUri); return ...parse title HTML...; } } I asked for something to review my code, and someone suggested this approach. My question is why is the IHtmlDownloader variable readonly?

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• How to deploy a Java Swing application with an embedded JavaDB database?

  - by Jonas

  I have implemented an Java Swing application that uses an embedded JavaDB database. The database need to be stored somewhere and the database tables need to be created at the first run. What is the preferred way to do these procedures? Should I always create the database in the local directory, and first check if the database file exist, and if it doesn't exist let the user create the tables (or at least show a message that the tables will be created). Or should I let the user choose a path? but then I have to save the path somewhere. Should I save the path with Preferences.systemRoot();, and check if that variable is set on startup? If the user choses a path and save it in the Preferences, can I get any problems with user permissions? or should it be safe wherever the user store the database? Or how do I handle this? Any other suggestions for this procedure?

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• Select child of earlier clicked item in jQuery

  - by koko

  I have clicked on a div. In this div is an image: <div class="grid_2 shareContent" id="facebook_45"> <a href="#"><img class="facebook" src="http://roepingen.kk/skins/admin/default/images/social/facebook.png" alt="Facebook not shared" width="32px" height="32px" /></a> </div> How can I change the image in the div? I have the clicked item saved in the variable 'clicked'. If possible I'd like to delete the link around the image also.

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