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• How to explain OOP concepts to a non technical person?

  - by John

  I often try to avoid telling people I'm a programmer because most of the time I end up explaining to them what that really means. When I tell them I'm programming in Java they often ask general questions about the language and how it differs from x and y. I'm also not good at explaining things because 1) I don't have that much experience in the field and 2) I really hate explaining things to non-technical people. They say that you truly understand things once you explain them to someone else, in this case how would you explain OOP terminology and concepts to a non technical person?

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• Rationale behind freeware projects

  - by VexXtreme

  I've seen some freeware projects in the past where the author(s) invested a significant amount of their personal time and resources and never even considered charging for the software. A lot of these projects were donation based, and from what I've heard, donationware can never be a viable business model (even to simply support development costs) because most people choose not to donate if given an option. A lot of these projects eventually shut down because their authors could not sustain them further. Granted, some people simply like making the community happy (or something), but if you're struggling to keep your project alive, why not charge some small amount such as $10 simply to stay operational? If people find your software useful (and a lot of people found those projects VERY useful) they won't have a problem paying such a small amount. The question is: if you have a popular app that people like and download in great numbers, why not put a price tag on it? Why do it for free?

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• Xcode Video From UITableView [migrated]

  - by Luis Felipe Beltran

  I have created different UITableViews. Each of these are dynamic tables that contain NSarrays of words. Right now When a cell is tabbed it takes the user to another View (simple view controller) that has a label and a UIImageview that displays a picture. My problem is that I also want to show video. Some of these words need to show pictures, and others need to show video. I have shown video before but I have done it using a button. I need help! I would appreciate if you guys could help here. Again, Im trying to show a video from a UITableView after the user tabs a cell. (I have many videos not just one, so dynamically would be better if possible)

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• Elo system behaves oddly in program I've created

  - by adc

  Alright, so I'm looking to build a small program (C# and XAML) that, essentially, does this: Generate array of players. Each player has a current rating and a true rating. I set current rating to 1200 as a starting point right now; I've also tried setting it to true rating and the average of the two. True rating is what their skill level actually is. Their true rating is calculated based on percentages from the current League of Legends rating system; generating an array of 970 thousand generates results very similar to the data from here: (removed due to URL limit - but trust me, the results are very similar). This array is of length specified by the user. If need be, sort the array from smallest to largest. Play X number of games, again specified by the user. This is done by taking the array of players (which is sorted by Current Rating after being created) and running through it in groups of 10. The first five are on team one, the second five are on team two. It then takes the True Rating of these players and calculates an expected chance to win using the Elo system. It generates a random double and compares it to the expected chance to win; if the number is lower, team one wins - otherwise team two wins. I then update the rating of the players via, again, the Elo system - giving the winning team a score of 1 and the losing team a score of 0. I use a K value of 36 (but have tried 12, 24, and even higher ones) and an F value of 400. After going through the entire loop of players (which I have conveniently forced to be a multiple of ten), it sorts the array - again via current rating. This, if my understanding of the Elo system is correct, runs properly. However, it doesn't seem to work. I have a running test telling me how many players of the full array are within 100 current rating of their true rating. I would expect some portion of the population to be outside this range (as probability is not always going to go in their favor), but a full 40-45% of the population is outside of this range. I also have it outputting the maximum difference between true and current rating - and I have never seen this drop below 500! It hovers between 550-600, occasionally going over or under. I'm at a loss as to what to change - I've fiddled with the K and F values, where I start all the players, etc. but nothing changes the fact that eventually a good 40% of the population is outside the range. And it isn't that I have it playing too few games - it's now run through over 60 thousand games and the problem never disappears or really fluctuates. The full C# code, including everything except the XAML file and the Player class (pastebin is being very slow and I can only post two links, so I can't link to the XAML file): http://pastebin.com/rFcZRL84 The Player class: http://pastebin.com/4cJTdTRu I guess my question is did I do anything wrong? Is there a problem with the way I implemented the system, or is it just that Riot uses a significantly modified Elo system? I don't think it's the latter, as that still wouldn't explain the massive true and current rating differences to me, however.

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• Releasing a project under GPL v2 or later without the source code of libraries

  - by Luciano Silveira

  I wrote a system in Java that I want to release under the terms of GPL v2 or later. I've used Apache Maven to deal with all the dependencies of the system, so I don't have the source code of any of the libraries used. I've already checked, all the libraries were released under GPL-compatible licenses (Apache v2, 3-clause BSD, MIT, LGPL v2 and v2.1). I have 3 questions about this scenario: 1) Can I release a package with only the binaries of code I wrote, not including the libraries, and distribute only the source code I wrote? 2) Can I release a package with all the binaries, including the libraries, and distribute only the source code I wrote? 3) Can I release a package with all the binaries, including the libraries, and distribute only the source code I wrote plus the source code of the libraries licensed under the LGPL license?

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• Where do service implementations fit into the Microsoft Application Architecture guidelines?

  - by tuespetre

  The guidelines discuss the service layer with its service interfaces and data/message/fault contracts. They also discuss the business layer with its logic/workflow components and entities as well as the 'optional' application facade. What is unclear still to me after studying this guide is where the implementations of the service interfaces belong. Does the application facade in the business layer implement these interfaces, or does a separate 'service facade' exist to make calls to the business layer and it's facade/raw components? (With the former, there would be less seemingly trivial calls to yet another layer, though with the latter I could see how the service layer could remove the concerns of translating business entities to data contracts from the business layer.)

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• Materialized View vs POJO View based on Objects representing Oracle tables

  - by Zack Macomber

  I have about 12 Oracle tables that represent data that's being integrated from an external system into my web application. This data is going to be used in an informational and comparative manner for the clients using my web application. On one particular page of my web application, I need to combine data from 3 - 5 Oracle tables for display as an HTML table on the page. We are NOT currently using a framework (Apache Struts for instance) and we're not in a position to move this Java web application into one at this moment (I'm trying to get us there...). I am certainly not an architect, but I see one of two ways that I can effectively build this page (I know there are other ways, but these seem like they would be good ones...): 1. Create an Oracle Materialized View that represents what the HTML table should look like and then create a POJO based on the View that I can then integrate into my JSP. 2. Create POJOs that represent the Oracle tables themselves and then create another POJO that is the View used for the HTML table and then integrate that POJO into my JSP. To me, it seems the Materialized View would possibly offer quicker results which is always what we strive for in web applications. But, if I just create 12 POJOs that represent the Oracle tables and then build POJO Views off of those, I have the advantage of keeping all the code in one place for this and possibility for creating any number of different views and reusable components in my web application. Any thoughts on which one might be the better route? Or, maybe you know of an even better one?

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• why do we need to put private members in headers

  - by Simon

  Private variables are a way to hide complexity and implementation details to the user of a class. This is a rather nice feature. But I do not understand why in c++ we need to put them in the header of a class. I see some annoying downsides to this: it clutters the header from the user it force recompilation of all client libraries whenever the internals are modified Is there a conceptual reason behind this requirement? Is it only to ease the work of the compiler?

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• How do I create my own programming language and a compiler for it

  - by Dave

  I am thorough with programming and have come across languages including BASIC, FORTRAN, COBOL, LISP, LOGO, Java, C++, C, MATLAB, Mathematica, Python, Ruby, Perl, JavaScript, Assembly and so on. I can't understand how people create programming languages and devise compilers for it. I also couldn't understand how people create OS like Windows, Mac, UNIX, DOS and so on. The other thing that is mysterious to me is how people create libraries like OpenGL, OpenCL, OpenCV, Cocoa, MFC and so on. The last thing I am unable to figure out is how scientists devise an assembly language and an assembler for a microprocessor. I would really like to learn all of these stuff and I am 15 years old. I always wanted to be a computer scientist someone like Babbage, Turing, Shannon, or Dennis Ritchie. I have already read Aho's Compiler Design and Tanenbaum's OS concepts book and they all only discuss concepts and code in a high level. They don't go into the details and nuances and how to devise a compiler or operating system. I want a concrete understanding so that I can create one myself and not just an understanding of what a thread, semaphore, process, or parsing is. I asked my brother about all this. He is a SB student in EECS at MIT and hasn't got a clue of how to actually create all these stuff in the real world. All he knows is just an understanding of Compiler Design and OS concepts like the ones that you guys have mentioned (i.e. like Thread, Synchronization, Concurrency, memory management, Lexical Analysis, Intermediate code generation and so on)

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• Should a model binder populate all of the model?

  - by Richard

  Should a model binder populate all of the model, or only the bits that are being posted? For example, I am adding a product in my system and on the form i want the user to select which sites the new product will appear on. Therefore, in my model I want to populate a collection called "AllAvailableSites" to render the checkboxes for the user to choose from. I also need to populate the model with any chosen sites on a post in case the form does not validate, and I need to represent the form showing the initial selections. It would seem that I should let the model binder set the chosen sites on the model, and (once in the controller method) I set the "AllAvailableSites" on the model. Does that sound right? It seems more efficient to set everything in the model binder but someone is suggesting it is not quite right. I am grateful for any advice; I have to say that all the MVC model binding help online seems to cite really simple examples, nothing complicated. Do I really need a GET and a POST version of a method? Can't they just take the same view model? Then I check in my model binder if it is a GET/POST, and populate all the model accordingly.

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• GPL'ing code of a third party?

  - by Mark

  I am facing the following dilemma at the moment. I am using code from a scientific paper in a commercial project. So basically I copied and pasted the code from the paper's pdf into my code editor and use it in my own code. The code in the paper does not have any copy restrictions or license(like the GPL) so I thought I would be ok using it in a commercial project. However, I have seen several gpl licensed open source projects that use the exact same code from the paper to the point of having the same variable names like in the paper. So what happened here is that a gpl license was put on a third parties non gpl'ed code. Are these open source projects in violation of the gpl or would I be in violation of the gpl because I use code which has been gpl'ed? My common sense tells me it is not allowed to gpl somebody elses non-gpl'ed (like in this case from the paper) code but I though I would ask anyway.

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• Why write clean, refactored code?

  - by Shamal Karunarathne

  Hi programming lovers, This is a question I've been asking myself for a long time. Thought of throwing out it to you. From my experience of working on several Java based projects, I've seen tons of codes which we call 'dirty'. The unconventional class/method/field naming, wrong way of handling of exceptions, unnecessarily heavy loops and recursion etc. But the code gives the intended results. Though I hate to see dirty code, it's time taking to clean them up and eventually comes the question of "is it worth? it's giving the desired results so what's the point of cleaning?" In team projects, should there be someone specifically to refactor and check for clean code? Or are there situations where the 'dirty' codes fail to give intended results or make the customers unhappy? Do feel free to comment and reply. And tell me if I'm missing something here. Thanks.

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• Do logged in users need to browse a site over https?

  - by Luke

  I've never thought it was necessary, but a client has requested that all webpages served to logged in users be delivered over HTTPS. Aside from the implementation standpoint, which I don't think I'm going to pursue is there any real reason for this request ? For clarity, the login / logout process, account settings, registration preferences and all user related scripts are served over https. but I can't see the point in my news articles, press releases, events etc... being served in this manner? Am I missing something ?

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• How would I get work as a PHP, MySQL Developer?

  - by Matthew

  I've been working with PHP and MySQL to create various projects that I've been interested in, I can design the user interface, and the back end programming. I've created simple social networking sites, book marking sites, and project management software. So what steps would I take to get a job? Is there a market for PHP, MySQL web developers? Is it possible to take instructions and work from home for someone? How would I accept payment? Should I start a company? or work for someone? I am currently based in South Africa, many of the companies are lacking the innovation that I'm seeking for in a company.

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• Learning to implement dynamic language compiler

  - by TriArc

  I'm interested in learning how to create a compiler for a dynamic language. Most compiler books, college courses and articles/tutorials I've come across are specifically for statically typed languages. I've thought of a few ways to do it, but I'd like to know how it's usually done. I know type inferencing is a pretty common strategy, but what about others? Where can I find out more about how to create a dynamically typed language?

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• What are some reasonable arguments in favor of closed source software? [closed]

  - by Goma

  I like a technology (including programming language) but its platform is closed sourece and many times I meet people who ask me, "why do you use a closed source platform, why not use an open source alternative? If there is something wrong it should be with the closed source not with the open source, (as they say)". Actually I don't know how to answer their question. Could anyone tell me a good answer? Why do you use a closed source platform?

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• Is there a process-oriented IDE ?

  - by Raveline

  My problem is simple : when I'm programming in an OO paradigm, I'm often having part of a main business process divided in many classes. Which means, if I want to examine the whole functional chain that leads to the output, for debugging or for optimization research, it can be a bit painful. So I was wondering : is there an IDE that let you put a "process tag" on functions coming from different objects, and give you a view of all those functions having the same tag ? edit : To give an example (that I'm making up completely, sorry if it doesn't sound very realistic). Let's say we have the following business process for a HR application : receive a holiday-request by an employee, check the validity of the request, then give an alert to his boss ("one of those lazy programmer wants another day off"); at the same time, let's say the boss will want to have a table of all employee's timetable during the time the employee wants his vacations; then handle the answer of the boss, send a nice little mail to the employee ("No way, lazy bones"). Even if we get rid of everything not purely business-related (mail sending process, db handling to get the useful info, GUI functionalities, and so on), we still have something that doesn't really fit in "one class". I'd like to have an IDE that would give me the opportunity to embrace quickly, at the very least : The function handling the validation of the request by the employee; The function preparing the "timetable" for the boss; The function handling the validation of the request by the boss; I wouldn't put all those functions in the same class (but perhaps that's my mistake ?). This is where my dreamed IDE could be helpful.

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• C Programming matrix

  - by Bilal Khan

  In this program the user enters the # of columns of the matrix and then the entries of the matrix. So, for example, if the user enters 2 for column # and 1 2 3 4 for entries then the program develops a 2 by 2 matrix with 1 2 3 4 as entries. My program works perfectly in such a case. However, if the user for example had only entered 1 2 3 then my program makes a matrix with garbage values. I would like the program in such a case to exit the program. It is a simple question, but it has me baffled. #include<stdio.h> #include<stdlib.h> int main() { int m,x, n, c = 0, d,k, matrix[10][10], transpose[10][10], product[10][10]; printf("Enter the number of columns of matrix "); scanf("%d",&m); if(m<=0){ printf("You entered a invalid value."); exit(0); } else{ printf("Enter the elements of matrix \n"); for( c = 0 ; c < 10 ; c++ ) { for( d = 0 ; d < m ; d++ ) { scanf("%d",&matrix[c][d]); if (matrix[c][d] == 99) // 'x' is character variable I declared to use as a break break; // c = c+1; } if (matrix[c][d] == 99) break; } } printf("\nHere is your matrix:\n"); int i; for(i=0;i<c;i++) { for(d=0;d<m;d++) { printf("%3d ",matrix[i][d]); } printf("\n"); }

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• Designing a Business Rule Engine

  - by Nisha_Roy

  I have a requirement where there are 10 Rules to be applied on data in excel. If Rule 1 and Rule 2 fails rest of the rules are not checked. But if Rule 1 and Rule 2 passes the rest of all the Rules should be verified and if any errors found- they should be logged. Is there any design pattern which I can use to keep this Rule Engine flexible for adding these 10 rules and Closed for any additional chains in the Current Rule. I was thinking of something like a Decorator Pattern. Will this help me achieve that?

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• session management: verifying a user's log-in state

  - by good_computer

  I am storing sessions in my database. Everytime a user logs in, I create a new row corresponding to the new session, generate a new session id and send it as a cookie to the browser. My session data looks something like this: { 'user_id': 1234 'user_name': 'Sam' ... } When a request comes, I check whether a cookie with a session id is sent. If it is, I fetch session data from my database (or memcache) corresponding to that session id. When the user logs out, I remove the session data from my database (and memcache), and delete the cookie from the user's browser too. Notice that in my session data, I don't have something like logged_in: true. This is because if I find a session record in the database (or memcache) I deduce that the user is logged in, and if there is no session record found, the user is not logged in. My question is: is this the right approach? Should I have a logged_in key in my session data? Is there any possibility that a session record may be present on the server where the corresponding user is actually NOT logged in? Are there any security implications in having or not having such a key?

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• How does this ruby error handling module code work

  - by Michael Durrant

  Trying to get a better handle on ruby exception handling. I have this code (from a book): def err_with_msg(pattern) m = Module.new (class << m; self; end).instance_eval do define_method(:===) do |e| pattern === e.msg end end m end So ok this is a method. We're creating a new Module. I think of module as mix-ins. Not sure what it's doing here. Not we add the module to the class. Fair enough. Then we have self on its own. What that for? I guess we have a little anonymouse method this is just about self. hmmm ok, now for each of the above, check the pattern match. but for each, I thought the above for for a new Module, did the module get to use instance's by being included? A better explanation of what's going on here would be most helpful.

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• Any suggestions how it would be good to promote software in a small company ?

  - by Derfder

  Ok, I know if I am Red hat or other giant and offer some support etc. I can be profitable, in fact, Red Hat is doing quite well. However, what about a small company where I create a small program. e.g. an instant messenger for a windows or linux (just as an illustration) and I want to sell it. But how can I sell it if it is free and everybody can download it? Any advice? I like the idea of FSF by Richard Stallman, however I am missing the way how to sell my software under GNU/GPL licence. Any advice, how can I solve this problem? Any profitable small business software developers around with their opinion? Any links or names of small companies taht I can look at and study their model of business?

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• Understanding the Java Ecosystem

  - by syrion

  I have traditionally had the "luxury" of being a one-man development team. I've used Python extensively, have a reasonable command of Perl, PHP, and JavaScript. My problem is Java. I can write Java code. I'm not great at it--unlike Python, I rarely make use of anything unique to Java when I'm writing it. Furthermore, my experience is mostly in simple GUI/console programming. Unfortunately, I'm currently pursuing an IT degree where Java is the lingua franca. My database class is requiring that our projects be written in Java using servlets, and I just can't wrap my head around the ecosystem. Is there a good online overview of or tutorial on how the Java web ecosystem works? I have Thinking in Java, but it's mostly just the language itself (which I understand well enough to get by). I have looked at the Sun servlet tutorial, but it seems outdated.

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• Software Architecture and MEF composition location

  - by Leonardo

  Introduction My software (a bunch of webapi's) consist of 4 projects: Core, FrontWebApi, Library and Administration. Library is a code library project that consists of only interfaces and enumerators. All my classes in other projects inherit from at least one interface, and this interface is in the library. Generally speaking, my interfaces define either Entities, Repositories or Controllers. This project references no other project or any special dlls... just the regular .Net stuff... Core is a class-library project where concrete implementation of Entities and Repositories. In some cases i have more than 1 implementation for a Repository (ex: one for azure table storage and one for regular Sql). This project handles the intelligence (business rules mostly) and persistence, and it references only the Library. FrontWebApi is a ASP.NET MVC 4 WebApi project that implements the controllers interfaces to handle web-requests (from a mobile native app)... It references the Core and the Library. Administration is a code-library project that represents a "optional-module", meaning: if it is present, it provides extra-features (such as Access Control Lists) to the application, but if its not, no problem. Administration is also only referencing the Library and implementing concrete classes of a few interfaces such as "IAccessControlEntry"... I intend to make this available with a "setup" that will create any required database table or anything like that. But it is important to notice that the Core has no reference to this project... Development Now, in order to have a decoupled code I decide to use IoC and because this is a small project, I decided to do it using MEF, specially because of its advertised "composition" capabilities. I arranged all the imports/exports and constructors and everything, but something is quite not perfect in my "mental-visualisation": Main Question Where should I "Compose" the objects? I mean: Technically, the only place where real implementation access is required is in the Repositories, because in order to retrieve data from wherever, entities instances will be necessary, and in all other places. The repositories could also provide a public "GetCleanInstanceOf()" right? Then all other places will be just fine working with the interfaces instead of concrete classes... Secondary Question Should "Administration" implement the concrete object for "IAccessControlGeneralRepository" or the Core should?

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• Powershell Active Directory Account Attribute to a variable

  - by Bill Garrett

  Sorry for the newbie question. I am using Powershell 3 to get a list of all user accounts. I am trying to generate an output for accounts, either "Enabled" or "Disabled". I am able to get the account status code from active directory using: $rc = $Rech.PropertiesToLoad.Add("userAccountControl"); That will display the correct account status code. When I try to use an if statement on the value, I dont get any result. How do I put this value into a variable to use some logic with it? In the end, my requirements are to have the output to an CSV file that I can send to HR and have them examin it and instead of a code I would like to have it say "Enabled" or "Disabled". Thank you.

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