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• Does heavy library and snippet codes usage make you a bad programmer?

  - by Henrik P.

  Overall I'm in programming for about 8 years now and it seems to me that I'm relying more and more on open source libraries and snippets (damn you GitHub!) to "get the job done". I know that in time I could write me own implementation but I like to focus on the overall design. Is this normal (non cooperate environment)? Does it make you a bad programmer if "programming" is nothing more than cluing different libraries together. Feels like it. I know about "don't reinvent the wheel" but what happens when you don't invent a single wheel anymore. What's your take on this?

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• Reporting defects in Agile

  - by user3728779

  I am working in sprint. At the end of sprint I need to send a defect report per sprint. Considering the below scenario please let me know your views. Two teams(A & B) are working at different locations in Sprint-2 and I am a tester from Team-A and report the defects for the items developed by Team-A in each sprint Question 1. I reported few defects in Sprint-2 for the functionality developed by Team-B in previous sprint. Do I have to consider this as observation or defect and report to Team-A? 2. I reported 5 defects of Sprint-2 for the functionality developed by team-A. All the defects are fixed and closed by me in the same sprint. Before the end of sprint I observed 2 defects got reopened for some reason. Now the defect count should be 5 or 7(5+2) should be considered for this sprint? Thanks Khan

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• Contracting rate for Android development

  - by Robottinosino

  I am a developer, maybe I have a project to work on, not sure how much to "charge" for my work.... Help me find the price? Looking for an contracting rate interval, expressed in EUR, to offer for an Android development gig. Location: Europe, off-site (telecommuting) Environment: Android + HTTP back-end Length of project: 1 month Rate currency: EUR Rate measure: daily or hourly Other skills required: UI design, basic J2EE, web services Client profile: medium business (100+ employees) Previous published apps: 1, on G-Play Design work: partially already done, data flow is established, data models to be built Required graphics/multimedia elements: provided by the client Source control: remove over SSH Team size: one person in development, others (unknown) for marketing, copy, etc. Risk factor: medium Client reputation: modest but established Potential for continued work: absent (for now) Internationalisation/localisation: no Native code (C/C++,...): none, only Android SDK, pure Java Working culture: (based on initial discussion) - high pressure Other projects in the pipe: zero Opportunity to learn from the project or build new skills: 5% Negotiating experience: good Cost of accessories: (licenses, device to debug on) zero If I need to be more precise, please just say how and I will be.

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• How to write a very basic compiler [closed]

  - by Ali

  Possible Duplicate: Best Online resources to learn about Compilers? What would be the best way to learn about compilers, and executable formats? Advanced compilers like gcc compile codes into machine readable files according to the language in which the code has been written (e.g. C, C++, etc). In fact, they interpret the meaning of each codes according to library and functions of the corresponding languages. Correct me if I'm wrong. I wish to better understand compilers by writing a very basic compiler (probably in C) to compile a static file (e.g. Hello World in a text file). I tried some tutorials and books, but all of them are for practical cases. They deal with compiling dynamic codes with meanings connected with the corresponding language. How can I write a basic compiler to convert a static text into a machine readable file? The next step will be introducing variables into the compiler; imagine that we want to write a compiler which compile only some functions of a language. Introducing practical tutorials and resources is highly appreciated :-)

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• What's a good, quick algorithms refresh?

  - by Casey Patton

  I have programming interviews coming up in a couple weeks. I took an algorithms class a while ago but likely forgot some key concepts. I'm looking for something like a very short book (< 100 pages) on algorithms to get back up to speed. Sorting algorithms, data structures, and any other essentials should be included. It doesn't have to be a book...just looking for a great way to get caught up in about a week. What's the best tool for a quick algorithms intro or refresher?

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• What encoding is used by javax.xml.transform.Transformer?

  - by Simon Reeves

  Please can you answer a couple of questions based on the code below (excludes the try/catch blocks), which transforms input XML and XSL files into an output XSL-FO file: File xslFile = new File("inXslFile.xsl"); File xmlFile = new File("sourceXmlFile.xml"); TransformerFactory tFactory = TransformerFactory.newInstance(); Transformer transformer = tFactory.newTransformer(new StreamSource(xslFile)); FileOutputStream fos = new FileOutputStream(new File("outFoFile.fo"); transformer.transform(new StreamSource(xmlFile), new StreamResult(fos)); inXslFile is encoded using UTF-8 - however there are no tags in file which states this. sourceXmlFile is UTF-8 encoded and there may be a metatag at start of file indicating this. am currently using Java 6 with intention of upgrading in the future. What encoding is used when reading the xslFile? What encoding is used when reading the xmlFile? What encoding will be applied to the FO outfile? How can I obtain the info (properties) for 1 - 3? Is there a method call? How can the properties in 4 be altered - using configuration and dynamically? if known - Where is there info (web site) on this that I can read - I have looked without much success.

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• Make a controller a superclass in MVC design pattern

  - by Nikola

  I am really confused how to handle this. I have: model.Outsider model.SubContractor (which extends Outsider) Basically, Outsider would mean Supplier, but SubContractor is not a Supplier itself so I had to divide it somehow. I used to have model.Outsider (super class of the two bellow) model.Supplier model.SubContractor But Supplier didn't have any unique fields so I have removed it (Was this correct?) So, continuing, I have db layer which has: db.DBOutsider db.DBSubContractor (which again extends the top one) And I have no place to put my Supplier methods. I can do that in DBOutsider, but then DBSubContractor (which extends DBOutsider) would get unnecessary methods. Do I create a DBSupplier even though there is no such class in the model layer? Then again, going to controller layer. It is the same situation as db layer. I have OutsiderController and SubContractorController (which extends the first one) (is this correct in first place? to have an extended controller?). But I have no place to put the methods which are concerned with Supplier and if I put them in the OutsiderController the SubContractorController would recieve unneccessary methods. At the moment I am going for the extra DBSupplier and SupplierController classes, but I have no idea if this is the correct way. Basically what perplexes me is the "empty" Supplier. Since it is supposed to be an Outsider but has no extra methods or fields, should there be an empty class?

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• Project migration tips [closed]

  - by Shirish11

  I would like to know what all things are to be considered when your client asks for Project Migration to a different language / version. Migrating an existing project to a higher version is not going to be much of a trouble. Have to take care of some system files, some settings changes and if version specific components included then search for them to comply with the newer version. I understand why you need to migrate projects to newer versions mostly for overcoming the drawbacks of current version. But I have absolutely no idea how to go about language migration. Any help on this is appreciated . Moreover is language migration a healthy idea?

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• Operating systems -- using minimum number of semaphores

  - by stackuser

  The three cooperating processes all read data from the same input device. Each process, when it gets the input device, must read two consecutive data. I want to use mutual exclusion to do this. The declaration and initialization that I think would work here are: semaphore s=1 sa1 = 0, sa2 = 0, sb1 = 0, sb2 = 0, sc1 = 0, sc2 = 0 I'd like to use semaphores to synchronize the following processes: P1: P2: P3: input(a1,a2) input (b1,b2) input(c1,c2) Y=a1+c1 W=b2+c2 Z=a2+b1 Print (X) X=Z-Y+W I'm wondering how to use the minimum number of semaphores to solve this. Diagram of cooperating Processes and one input device: It seems like P1 and P2 would start something like: wait(s) input (a1/b1, a2/b2) signal(s)

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• Which design better when use foreign key instead of a string to store a list of id

  - by Kien Thanh

  I'm building online examination system. I have designed to table, Question and GeneralExam. The table GeneralExam contains info about the exam like name, description, duration,... Now I would like to design table GeneralQuestion, it will contain the ids of questions belongs to a general exam. Currently, I have two ideas to design GeneralQuestion table: It will have two columns: general_exam_id, question_id. It will have two columns: general_exam_id, list_question_ids (string/text). I would like to know which designing is better, or pros and cons of each designing. I'm using Postgresql database.

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• Java web app, with plugin framework and ability to connect to source for updates

  - by lessthancommon

  I've searched all around for some good sources, but either have been searching for the wrong keywords, or I'm just missing something. I'm looking to redevelop a web app I've been using for some time now. Many parts are out of date, and we're constantly throwing in little hacks to attempt to give it new life. So what I'd like to do is re-engineer it from the ground up, built on some sort of plug-in framework. Before I continue, I'm more or less an intermediate Java programmer. In some ways, I'm hoping to use this project as a big learning experience. I've read a lot about OSGi, and it seems that's the most complete framework. Ideally, I would like an end result web app which I can run one instance as my hosting environment, and other instances can connect to it to grab new and updated plug-ins. Eventually I'll want to lock down these plug-ins based on some undecided criteria of who can get them (basically some will simply be updates, others will provide new functionality and should be "purchased" through an external system). But that will probably be handled in a later phase. There should be an administration view for managing bundles in a hot environment (looking to avoid having to restart the server for an update). I know all these things are possible, I'm just trying to find some good resources for reference. All the OSGi tutorials I'm finding seem to be too simplistic. If anyone here can guide me in the right direction on any or all of the items I'm looking for, it would be much appreciated. Also, this is my first post, so I'll take any comments/criticisms about the content of my post. Thanks!

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• What's better than outputdebugstring for windows debugging?

  - by Peter Turner

  So, before I came to my current place of employment, the windows OutputDebugString function was completely unheard of, everyone was adding debug messages to string lists and saving them to file or doing showmessage popups (not very useful for debugging drawing issues). Now everybody (all 6 of us) is like "What can I say about this OutputDebugString?" and I'm like, "with much power comes much responsibility." I kind of feel as though I've passed a silent but deadly code smell to my colleagues. Ideally we wouldn't have bugs to debug right? Ideally we'd have over 0% code coverage, eh? So as far as petty debugging is concerned (not complete rewriting of a 3 million line Delphi behemoth) what's a better way to use debug running code than just adding OutputDebugString all over?

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• How to deal with ad-hoc mindsets?

  - by Rotian

  I joined a dev team of six two month ago. People are nice, all is good. But more and more I observe an ad-hoc mindset. Stuff gets quick fixed, at the cost of future usability, there is little testing and two people happily admitted, that they like to carry the knowledge around in their head, rather than to write it down. How to deal with this? I'd like to lead by example, but time is limited - I like architecting and actually implementing the stuff. But I'm afraid the ad-hoc mindset infects me and rather than striving for clearness and simplicity in design and code - which isn't simple to establish - I get pulled down the drain of an endless spiral of hacks on hacks - which no outsider can uncouple - just for schedule's and management's sake.

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• Theoretically bug-free programs

  - by user2443423

  I have read lot of articles which state that code can't be bug-free, and they are talking about these theorems: Halting problem Gödel's incompleteness theorem Rice's theorem Actually Rice's theorem looks like an implication of the halting problem and the halting problem is in close relationship with Gödel's incompleteness theorem. Does this imply that every program will have at least one unintended behavior? Or does it mean that it's not possible to write code to verify it? What about recursive checking? Let's assume that I have two programs. Both of them have bugs, but they don't share the same bug. What will happen if I run them concurrently? And of course most of discussions talked about Turing machines. What about linear-bounded automation (real computers)?

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• How do you dive into large code bases?

  - by miku

  What tools and techniques do you use for exploring and learning an unknown code base? I am thinking of tools like grep, ctags, unit-tests, functional test, class-diagram generators, call graphs, code metrics like sloccount and so on. I'd be interested in your experiences, the helpers you used or wrote yourself and the size of the codebase, with which you worked with. I realize, that this is also a process (happening over time) and that learning can mean "can give a ten minute intro" to "can refactor and shrink this to 30% of the size". Let's leave that open for now.

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• How to setup the c++ rule of three in a virtual base class

  - by Minion91

  I am trying to create a pure virtual base class (or simulated pure virtual) my goal: User can't create instances of BaseClass. Derived classes have to implement default constructor, copy constructor, copy assignment operator and destructor. My attempt: class Base { public: virtual ~Base() {}; /* some pure virtual functions */ private: Base() = default; Base(const Base& base) = default; Base& operator=(const Base& base) = default; } This gives some errors complaining that (for one) the copy constructor is private. But i don't want this mimicked constructor to be called. Can anyone give me the correct construction to do this if this is at all possible?

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• Can I re-license Academic Free License code under 2-Clause BSD / ITC?

  - by Stefano Palazzo

  I want to fork a piece of code licensed under the Academic Free License. For the project, it would be preferable to re-license it under the ISC License or the 2-Clause BSD license, which are equivalent. I understand that the AFL grants me things such as limitation of liability, but licensing consistency is much more important to the project, especially since we're talking about just 800 lines of code, a quarter of which I've modified in some way. And it's very important for me to give these changes back to the community, given the fact that this is software relevant to security - I need the public scrutiny that I'll get by creating a public fork. In short: At the top of the file I want to say this, or something like it: # Licensed under the Academic Free License, version 3 # Copyright (C) 2009 Original Author # Licensed under the ISC License # Copyright (C) 2012 Stefano Palazzo # Copyright (C) 2012 Company Am I allowed to do this? My research so far indicates that it's not clear whether the AFL is GPL-Compatible, and I can't really understand any of the stuff concerning re-licensing to other permissive licenses. As a stop gap, I would also be okay with re-licensing under the GPL, however: I can find no consensus (though I can find disagreement) on whether this is allowed at all, and I don't want to risk it, of course. Wikipedia: ISC License Wikipedia: Academic Free License

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• Does software rot refer primarily to performance, or to messy code?

  - by Kazark

  Wikipedia's definition of software rot focuses on the performance of the software. This is a different usage than I am used to; I had thought of it much more in terms of the cleanliness and design of the code—in terms of the code's having all the standard quality characteristics: readability, maintainability, etc. Now, performance is likely to go down when the code becomes unreadable, because no one knows what is going on. But does the term software rot have special reference to performance? or am I right in thinking it refers to the cleanliness of the code? or is this perhaps a case of multiple senses of the term being in common usage—from the user's perspective, it has do with performance; but for the software craftsman, it has to do more specifically with how the code reads?

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• Python C API return more than one value / object without building a tuple [migrated]

  - by Grisu

  I got the following problem. I have written a C-Extension to Python(2.7 / 3.2) to interface a self written software library. Unfortunately I need to return two values from the function where the last one is optional. In Python I tried def func(x,y): return x+y, x-y test = func(13,4) but test is a tuple. If I write test1,test2 = func(13,4) I got both values separated. Is there a possibility to return only one value without unpacking the tuple, i.e. the second(,.. third, ..fourth) value gets neglected? And if such a solution existst, how does it look for the C-API? Because return Py_BuildValue("ii",x+y,x-y); results in a tuple as well.

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• Few specific questions on how games are developed

  - by russ

  When it comes to programming games from the old school sega games like sonic to indie games or angry birds or even to more advance games like Diablo, how exactly is level design done? As in, are the levels sometimes designed straight out of code in an IDE? Or do they create a visual level design editor where things can be placed at the click of a mouse button? I'm imagining old school games or very simple ones like indies are done via code, where extremely complicated ones require a visual editor. Is this correct? Also, when it comes to libraries like SDL or XNA, how often are these used rather than just utilizing OpenGL or DirectX? What about creating your own game engine vs utilizing one already made? Do most use already built engines? This question is directed toward the whole gaming spectrum of indie/big game development. Thanks.

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• What are some arguments AGAINST using EntityFramework?

  - by Rachel

  The application I am currently building has been using Stored procedures and hand-crafted class models to represent database objects. Some people have suggested using Entity Framework and I am considering switching to that since I am not that far into the project. My problem is, I feel the people arguing for EF are only telling me the good side of things, not the bad side :) My main concerns are: We want Client-Side validation using DataAnnotations, and it sounds like I have to create the client-side models anyways so I am not sure that EF would save that much coding time We would like to keep the classes as small as possible when going over the network, and I have read that using EF often includes extra data that is not needed We have a complex database layer which crosses multiple databases, and I am not sure EF can handle this. We have one Common database with things like Users, StatusCodes, Types, etc and multiple instances of our main databases for different instances of the application. SELECT queries can and will query across all instances of the databases, however users can only modify objects that are in the database they are currently working on. They can switch databases without reloading the application. Object modes are very complex and there are often quite a few joins involved Arguments for EF are: Concurrency. I wouldn't have to code in checks to see if the record was updated before each save Code Generation. EF can generate partial class models and POCOs for me, however I am not positive this would really save me that much time since I think we would still need to create the client-side models for validation and some custom parsing methods. Speed of development since we wouldn't need to create the CRUD stored procedures for every database object Our current architecture consists of a WPF Service which handles database calls via parameterized Stored Procedures, POCO objects that go to/from the WCF service and the WPF client, and the WPF client itself which transforms POCOs into class Models for the purpose of Validation and DataBinding.

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• iPhone App Store Release Question!

  - by Ahmad Kayyali

  I am developing an Application its purpose to view uploaded files on the host server, and it has a credentials that will be entered on the Login Page to authenticate the user. My Question! when I post my application to the App Store how suppose apple is going to test or at least view my application when Apple needs enter a valid credentials that I am not suppose to know, it's private to my client. Any guide would be greatly appreciated.

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• Resources for popular domain models

  - by Songo

  I have come across many situations where I had to build a system for a library or a clinic or other popular domains. The thing is a domain model for a library was probably done 1000 times already with different level of details of course. Here is an example. Is there a popular website or community where one can find ready made domain models for popular systems? The whole purpose I'm trying to achieve is to quickly get a grasp of the domain I'm modeling and customize it to my needs. Re-inventing the wheel seems really absurd when the same system might have been modeled properly previously. Note I know Google might sound like the perfect source, but there is a repository out there that people can post there models, so that others can share them.

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• Can I use access used by Visual Basic for building a database [on hold]

  - by user3413537

  I am the only programmer where I work (summer job) and I am a student with only a few years of programming experience. So I was asked to build a database and I am very excited about this project because hopefully I can learn a lot from this. Using this database my manager is supposed to be able to assign work (dealing with businesses) to different people within the company using an interface (all workers have a shared drive). When workers are done with that paperwork related to the business, they can check off that its done, add comments at the bottom of the interface, and then move on to the next business. The only experience I've had with databases is some querying with SQL, and I've built GUI interfaces with JAVA. The information on the interface will be populated from Excel so workers know what businesses they are dealing with. I've done some research and I believe the best way to build this would be building a GUI using Microsoft Visual Studio (Visual Basic) first, then figuring out a way to populate the Interface from Excel. Also because the data is pretty straight forward and not complicated I will be using MS Access to store and track the database. I know this won't be easy, but for all you geniuses out there, is this on the right path? Thanks.

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• How to write reusable code in node.js

  - by lortabac

  I am trying to understand how to design node.js applications, but it seems there is something I can't grasp about asynchronous programming. Let's say my application needs to access a database. In a synchronous environment I would implement a data access class with a read() method, returning an associative array. In node.js, because code is executed asynchronously, this method can't return a value, so, after execution, it will have to "do" something as a side effect. It will then contain some code which does something else than just reading data. Let's suppose I want to call this method multiple times, each time with a different success callback. Since the callback is included in the method itself, I can't find a clean way to do this without either duplicating the method or specifying all possible callbacks in a long switch statement. What is the proper way to handle this problem? Am I approaching it the wrong way?

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