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  • How to convert from K&R C to ANSI C?

    - by Vadakkumpadath
    I am trying to execute following code which is the 1988 entry of Obfuscated C Code Contest. #define _ -F<00||--F-OO--; int F=00,OO=00;main(){F_OO();printf("%1.3f\n",4.*-F/OO/OO);}F_OO() { _-_-_-_ _-_-_-_-_-_-_-_-_ _-_-_-_-_-_-_-_-_-_-_-_ _-_-_-_-_-_-_-_-_-_-_-_-_-_ _-_-_-_-_-_-_-_-_-_-_-_-_-_-_ _-_-_-_-_-_-_-_-_-_-_-_-_-_-_ _-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_ _-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_ _-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_ _-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_ _-_-_-_-_-_-_-_-_-_-_-_-_-_-_ _-_-_-_-_-_-_-_-_-_-_-_-_-_-_ _-_-_-_-_-_-_-_-_-_-_-_-_-_ _-_-_-_-_-_-_-_-_-_-_-_ _-_-_-_-_-_-_-_ _-_-_-_ } From entry description, this code is calculating pi by looking at its own area. I successfully compiled it without changing the code. But when I executed, it is giving me a value 0.25, what I am expecting is 3.14. Code description says it is in K&R C and it doesn't work correctly in ANSI C without some change. I think I have to do those modification to execute it properly. I don't have any previous experience with K&R C. So can someone help me to change above code to ANSI C or point to the problems if any. I am using Microsoft Visual Studio 2008 to execute this.

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  • How to properly name record creation(insertion) datetime field ?

    - by alpav
    If I create a table with datetime default getdate() field that is intended to keep date&time of record insertion, which name is better to use for that field ? I like to use Created and I've seen people use DateCreated or CreateDate. Other possible candidates that I can think of are: CreatedDate, CreateTime, TimeCreated, CreateDateTime, DateTimeCreated, RecordCreated, Inserted, InsertedDate, ... From my point of view anything with Date inside name looks bad because it can be confused with date part in case if I have 2 fields: CreateDate,CreateTime, so I wonder if there are any specific recommendations/standards in that area based on real reasons, not just style, mood or consistency. Of course, if there are 100 existing tables and this is table 101 then I would use same naming convention as used in those 100 tables for the sake of consistency, but this question is about first table in first database in first server in first application.

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  • Rspec-rails doesn't seem to find my models

    - by sa125
    Hi - I'm trying out rspec, and immediately hit a wall when it doesn't seem to load db records I know exist. Here's my fairly simple spec (no tests yet). require File.expand_path(File.dirname(__FILE__) + '../spec_helper') describe SomeModel do before :each do @user1 = User.find(1) @user2 = User.find(2) end it "should do something fancy" end I get an ActiveRecord::RecordNotFound exception, saying it couldn't find User w/ ID=1 or ID=2, which I know for a fact exist. I set both test and development databases to point to the same schema in database.yml, so this shouldn't be database mixup. I also ran script/generate rspec after installing the gems (rspec, rspec-rails), and gem.config both environment.rb and test.rb. Any idea what I'm missing? thanks. EDIT Seems I was running the tests with rake spec:models, which emptied the db and thus no records were found. When I used % spec spec/models/some_model_spec.rb, everything worked as expected.

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  • Functional Programming - Lots of emphasis on recursion, why?

    - by peakit
    I am getting introduced to Functional Programming [FP] (using Scala). One thing that is coming out from my initial learnings is that FPs rely heavily on recursion. And also it seems like, in pure FPs the only way to do iterative stuff is by writing recursive functions. And because of the heavy usage of recursion seems the next thing that FPs had to worry about were StackoverflowExceptions typically due to long winding recursive calls. This was tackled by introducing some optimizations (tail recursion related optimizations in maintenance of stackframes and @tailrec annotation from Scala v2.8 onwards) Can someone please enlighten me why recursion is so important to functional programming paradigm? Is there something in the specifications of functional programming languages which gets "violated" if we do stuff iteratively? If yes, then I am keen to know that as well. PS: Note that I am newbie to functional programming so feel free to point me to existing resources if they explain/answer my question. Also I do understand that Scala in particular provides support for doing iterative stuff as well.

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  • fast algorithm implementation to sort very small set

    - by aaa
    hello. This is the problem I ran into long time ago. I thought I may ask your for your ideas. assume I have very small set of numbers (integers), 4 or 8 elements, that need to be sorted, fast. what would be the best approach/algorithm? my approach was to use the max/min functions. I guess my question pertains more to implementation, rather than type of algorithm. At this point it becomes somewhat hardware dependent , so let us assume Intel 64-bit processor with SSE3 . Thanks

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  • formula for best approximation for center of 2D rotation with small angles

    - by RocketSurgeon
    This is not a homework. I am asking to see if problem is classical (trivial) or non-trivial. It looks simple on a surface, and I hope it is truly a simple problem. Have N points (N = 2) with coordinates Xn, Yn on a surface of 2D solid body. Solid body has some small rotation (below Pi/180) combined with small shifts (below 1% of distance between any 2 points of N). Possibly some small deformation too (<<0.001%) Same N points have new coordinates named XXn, YYn Calculate with best approximation the location of center of rotation as point C with coordinates XXX, YYY. Thank you

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  • What features are important in a programming language for young beginners?

    - by NoMoreZealots
    I was talking with some of the mentors in a local robotics competition for 7th and 8th level kids. The robot was using PBASIC and the parallax Basic Stamp. One of the major issues was this was short term project that required building the robot, teaching them to program in PBASIC and having them program the robot. All in only 2 hours or so a week over a couple months. PBASIC is kinda nice in that it has built in features to do everything, but information overload is possible to due this. My thought are simplicity is key. When you have kids struggling to grasp: if X>10 then <DOSOMETHING> There is not much point in throwing "proper" object oriented programming at them. What are the essentials needed to foster an interest in programming?

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  • What is the correct way to backup ZODB blobs?

    - by joeforker
    I am using plone.app.blob to store large ZODB objects in a blobstorage directory. This reduces size pressure on Data.fs but I have not been able to find any advice on backing up this data. I am already backing up Data.fs by pointing a network backup tool at a directory of repozo backups. Should I simply point that tool at the blobstorage directory to backup my blobs? What if the database is being repacked or blobs are being added and deleted while the copy is taking place? Are there files in the blobstorage directory that must be copied over in a certain order?

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  • How can I read a textfile into matlab and make it a list?

    - by Ben Fossen
    I have a textfile that has the format gene complement(22995..24539) /gene="ppp" /locus_tag="MRA_0020" CDS complement(22995..24539) /gene="ppp" /locus_tag="MRA_0020" /codon_start=1 /transl_table=11 /product="putative serine/threonine phosphatase Ppp" /protein_id="ABQ71738.1" /db_xref="GI:148503929" gene complement(24628..25095) /locus_tag="MRA_0021" CDS complement(24628..25095) /locus_tag="MRA_0021" /codon_start=1 /transl_table=11 /product="hypothetical protein" /protein_id="ABQ71739.1" /db_xref="GI:148503930" gene complement(25219..26802) /locus_tag="MRA_0022" CDS complement(25219..26802) /locus_tag="MRA_0022" /codon_start=1 /transl_table=11 /product="hypothetical protein" /protein_id="ABQ71740.1" /db_xref="GI:148503931" I would like to read the textfile into Matlab and make a list with the information from the line gene as the starting point for each item in the list. So for this example there will be 3 items in the list. I have tried a few things and cannot get this to work. Anyone have any ideas of what I can do?

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  • reference parent class function in AS 3.0

    - by vasion
    I am trying to run a function of the main class, but even with casting it does not work. I get this error TypeError: Error #1009: Cannot access a property or method of a null object reference. at rpflash.communication::RPXMLReader/updateplaylist() at rpflash.communication::RPXMLReader/dataHandler() at flash.events::EventDispatcher/dispatchEventFunction() at flash.events::EventDispatcher/dispatchEvent() at flash.net::XMLSocket/scanAndSendEvent() this is the main class code package{ import flash.display.MovieClip; import rpflash.communication.RPXMLReader; public class Main extends MovieClip{ var reader:RPXMLReader = new RPXMLReader(); public function Main(){ trace('Main actionscript loaded'); } public function test(){ trace('test worked');} } } and this is the function trying to call it: private function updateplaylist(){ //xml to string var xmls:String= xml.toXMLString(); trace('playlist updated debug point'); MovieClip(this.parent).test();} what am i doing wrong?

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  • Recording/Reading C doubles in the IEEE 754 interchange format

    - by rampion
    So I'm serializing a C data structure for cross-platform use, and I want to make sure I'm recording my floating point numbers in a cross-platform manner. I had been planning on just doing char * pos; /*...*/ *((double*) pos) = dataStructureInstance->fieldWithOfTypeDouble; pos += sizeof(double); But I wasn't sure that the bytes would be recorded in the char * array in the IEEE 754 interchange format. I've been bitten by cross-platform issues before (endian-ness and whatnot). Is there anything I need to do to a double to get the bytes in interchange format?

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  • Best practices on what data to collect in an in-app web analytics

    - by Anton Gogolev
    Hi! In our SaaSy webapp we need to collect Google Analytics-like data (like, what pages were visited, how many 404s where there, etc.). I wonder if there are any best practices on what pieces of information should be collected (like, IP, User Agent, etc.) and how should these logs be stored. Requirements on what statistics we're going to display are not yet fixed, but I want to have a starting point. Can you help me out with this? Thanks.

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  • Is it good or bad practice to use var everywhere? [closed]

    - by Earlz
    Possible Duplicate: Use of var keyword in C# Hello, I've recently been discovering the awesomeness that is the var keyword in C#. Well, I didn't think about it before but I just wrote lines of code that are along the lines of var con=CreateNewConnection(); Where this would usually be IdbConnection con=CreateNewConnection(); Is this a good use of var? Is it possible to use var too often? Are there any downsides to using it? Also, one more point of consideration: We are not worried about backwards compatability. We just care that it runs on .NET 3.5

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  • Automatic camera calibration

    - by srand
    From Wikipedia, camera resectioning is the process of finding the true parameters of the camera that produced a given photograph or video. Camera resectioning is also known as geometric camera calibration. Currently I am using Camera Calibration Toolbox for Matlab for my camera calibration. The toolbox returns calibration parameters such as focal length, principle point, skew, and distortion. However, the issue with this method is that it requires an extra step in calibrating the camera by using a special calibration object like a checkerboard. Additionally, it only works for one focus of the camera. How can I get the calibration parameters without manually calibrating? For example, how does Microsoft's Photosynth perform camera calibration on its images?

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  • Coding guidelines + Best Practices?

    - by Chathuranga Chandrasekara
    I couldn't find any question that directly applies to my query so I am posting this as a new question. If there is any existing discussion that may help me, please point it out and close the question. Question: I am going to do a presentation on C# coding guidelines but it is not supposed to limit to coding standards. So I have a rough idea but I think I need to address good programing practices. So the contents will be something like this. Basic coding standards - Casing, Formatting etc. Good practices - Usage of Hashset over other data structures, String vs String Builder, String's immutability and using them effectively etc Really I would like to add more good practices (Especially to improve the performance.) So like to hear some more good practices to be used with C#. Any suggestions??? (No need of large descriptions :) Just the idea is sufficient.)

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  • How to run script from command-line

    - by Eric
    I want to write a script that counts the types of objects there are in the ZODB, when they were created, how many users have joined since a given point in time,etc. I am wondering how to accomplish this. So, was wondering if there is a way to pass a script to bin/instance to be executed. I've created this script with a py script but it takes a VERY long time to finish and this is why I would like to do this from the command-line... in the hopes of it running faster. Thanks ERic

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  • What is an Ontology (Database?) ?

    - by Robert Gould
    I was just reading this article and it mentions that some organization had an Ontology as(?) their database(?) layer, and that the decision to do this was bad. Problem is I hadn't heard about this before, so I can't understand why it's bad. So I tried googling about databases and ontology, and came about quite a few pdfs from 2006 that we're full of incomprehensible content (for my mind). I read a few of these and at this point still have absolutely no idea what they are talking about. My current impression is that it was some crazy fad of 2006 that some academics were trying to sell us, but failed miserably due to the wording of their ideas. But I'm still curious if anyone actually knows what this is actually all about.

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  • Updating the datalist in a RadComboBox

    - by jphenow
    So I'm just struggling with a lot of little things in the web app so I'm checking up with all kinds of stuff to make sure i'm not breaking it cause of stupid problems. At some point in my web app (trying to keep it mostly Asynchronous) I have to update the list in my RadComboBox because something was added. Do I just need to call RadComboBox.DataBind() again? Since I don't explicitly use its datasource(I do it in the manual insert using a string fashion) object to insert my new record do I need to tell that to update? The list just doesn't seem to update when i just call databind so I feel like i need to have the datasource recheck for entries or SOMETHING Thanks

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  • Java book for programmer with intermediate experience

    - by Anthony Forloney
    I am well aware of this previous question here and have heard great things about those books. I actually bought two of them, Effective Java and Java in a Nutshell as an early Christmas present. I am looking for a good Java book, or books, to further continue my understanding of Java from a recent college graduate point of view. I have learned Java in college and would consider it to be the language I am most comfortable with. Can anyone recommend a good "intermediate" Java book for a situation like mine? This question should be community, I just don't know how to migrate it. I apologize for any inconvenience. Thank you in advance.

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  • Help with ActiveX Install? Merge Modules - Windows Vista and Windows 7

    - by Watts
    I'm building an ActiveX control installer in VS2008 which uses both the CRT and MFC merge modules to install. When my control tries to register on Windows 7 it fails. Dependency Walker says I'm missing the mfc90u.dll, msvcr90.dll and msvcp90.dll dependencies when trying to register my control and the install fails. Are the merge modules supposed to take care of this? My output OCX is being registered with the vsdrpCOMSelfReg option. From what I am reading on other forums, this might not be the best method, what should I try at this point? Install works fine on Windows XP.

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  • Calculate broadcast address from ip and subnet mask

    - by Kolja
    Hi I want to calculate the broadcast address for e.g -IP 192.168.3.1 -Subnet 255.255.255.0 =192.168.3.255 in C. I know the way (doing fancy bitwise OR's between the inversed IP and Subnet), but my problem is I come from the green fields of MacOSX Cocoa programing. I looked into the source of ipcal, but wasn't able to integrate it into my code base. There must be a simple 10 line of code example somewhere on the internet, I just can't find it. Could someone point me to a 10 line of code example of how to do it in C. Cheers, Kolja

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  • Java: "Could not find the main class. Program will exit"

    - by AJ
    I'm trying to run SQuirreL SQL. I've downloaded it and installed it, but when I try to run it I get this error message: Java Virtual Machine Launcher. Could not find the main class. Program will exit. I get the gist of this, but I have not idea how to fix it. Any help? more info: I'm on Windows XP pro. I have java 1.6 installed, and other apps are running OK. The install ran OK. I believe I've followed the installation instructions correctly. To run it, I'm invoking the squirrel-sql.bat file. Update This question: http://stackoverflow.com/questions/1417328/could-not-find-the-main-class gives some background on this error from the point of view of a java developer.

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  • Problem in Setting image in imageview inside ListView in Android?

    - by sunil
    Hi, I have a listview which includes 2 textviews and 1 imageview. Now, the image in imageview will be set on certain conditions otherwise it should be left blank with no image. The problem is the images are not coming in proper rows. Say, for eg the image should be displayed at row 3 but its displayed at row 4. And, in some cases each row will have the same image. Has someone faced this kind of an issue? I am really clueless about the reason behind this. Can anyone point out the problem? Regards Sunil

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  • How do i start with Gomoku?

    - by firstTry
    I read about Gomoku that it can be implemented using Minimax and Alpha-Beta Pruning algorithms. So, i read these algorithms and now understand how the game will be solved. But when i sat to down to code, I am facing problem how to approach it. As in , How to design the prototype functions like getNextMove or Max(Move) ? How will the next move searched? Till when should i apply the minimax algorithm. I know i can find the code online, but i want to do it myself. Can anyone please point me in the right direction?

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  • How hard is it to modify the Django Models?

    - by alex
    I am doing geolocation, and Django does not have a PointField. So, I am forced to writing in RAW SQL. GeoDjango, the Django library, does not support the following query for MYSQL databases (can someone verify that for me?) cursor.execute("SELECT id FROM l_tag WHERE\ (GLength(LineStringFromWKB(LineString(asbinary(utm),asbinary(PointFromWKB(point(%s, %s)))))) < %s + accuracy + %s)\ I don't nkow why GeoDjango library cannot do this in MYSQL database. I hate writing RAW SQL for calculating distances between two points. Is there a way I can create my own library for Django that can handle this? If so, how hard is it?

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