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• Scenario to illustrate how unit testing leads to better design

  - by Cocowalla

  For an internal training session, I'm trying to come up with a simple scenario that illustrates how unit testing leads to better design, by forcing you to think about things like coupling before you start coding. The idea is that I get the participants to code something first, without considering unit testing, then we do it again, but considering unit testing. Hopefully the code produced second time round should be more decoupled and maintainable. I'm struggling to come up with a scenario that can be coded quickly, yet can still demonstrate how unit testing can lead to better overall design.

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• Distribution upgrade made Ubuntu unusable

  - by Lassi

  I installed today a distribution update from 11.10 to 12.04. This however basically ruined the whole OS. After update I lost all the window borders, icons and even access to the internet. I'm also unable to use the default window manager and I had to use the old gnome. The computer is Acer Aspire 5738G laptop, Intel Pentium T4500, Ati Mobility Radeon HD 560v, 4Gb DDR 3. I am using the open source drivers, not proprietary. Does anyone have any idea what could've happened, and how could I fix this. Help is highly appreciated

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• How was 20Q made?

  - by Dan the Man

  Ever since I was a kid, I've wondered how they made the 20Q electronic game. In this game, which is it's on device, you think of an object, thing, or animal (e.g. a potato or a donkey), once you mentally choose your thing, the device goes through a series of questions such as: Is it larger than a loaf of bread? Is it found outdoors? Is it used for recreation? For each of the questions you can answer yes, no, maybe, or unknown. The way I've always thought of it to work was with immense, nested conditionals (if statements). But, I don't think that would be very likely as it would be terribly difficult to understand while coding it. I'm not looking for a discussion as SE doesn't allow it; I'm looking for concrete knowledge or solutions.

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• What are the benefits of Android way of "saving memory" - explicitly passing Context objects everywhere?

  - by Sarge Borsch

  Turned out, this question is not easy to formulate for me, but let's try. In Android, pretty much any UI object depends on a Context, and has defined lifetime. It also can destroy and recreate UI objects and even whole application process at any time, and so on. This makes coding asynchronous operations correctly not straightforward. (and sometimes very cumbersome) But I never have seen a real explanation, why it's done that way? There are other OSes, including mobile OSes (iOS, for example), that don't do such things. So, what are the wins of Android way (Activities & Contexts)? Does that allow Android applications to use much less RAM, or maybe there are other benefits?

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• Am I bored with programming? [closed]

  - by user1167074

  I have started programming 2 years back and I have learnt web programming while working for big corporate companies. I was very passionate and I even did couple of side projects which were well appreciated by my friends and colleagues. But for the past 2 months I am not doing anything really interesting with programming, even if I get good ideas I am not feeling like coding, sub consciously I am feeling like "So What?" if I do this project. I would like to know from the more experienced programmers if this is just a phase or am I really missing something? Thanks

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• Solving programming problems or contributing code?

  - by nischayn22

  What are the best skills to develop for a college graduate?? Should one spend hours/days trying to solve problems on codechef or topcoder or contribute code to open source organizations? My personal experience says solving problems teaches you how to make optimal code and learn new programming techniques (which someone else has researched and made available) to solve problems, whereas contributing to open source teaches you how to organize code (so others can work on it), use coding conventions and make "real" use of what you have learnt so far, blah blah!! Also another thing to note is that many companies are hiring today based on one's problem solving skills (Is this something I should worry about?) P.S. I have done little of online problem solving and little of code contribution (via GSoC), but left confused what I should continue doing (as doing both simultaneously isn't easy).

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• C: What is a good source to teach standard/basic code conventions to someone newly learning the language?

  - by shan23

  I'm tutoring someone who can be described as a rank newcomer in C. Understandably, she does not know much about coding conventions generally practiced, and hence all her programs tend to use single letter vars, mismatched spacing/indentation and the like, making it very difficult to read/debug her endeavors. My question is, is there a link/set of guidelines and examples which she can use for adopting basic code conventions ? It should not be too arcane as to scare her off, yet inclusive enough to have the basics covered (so that no one woulc wince looking at the code). Any suggestions ?

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• Alt/Shift key not released after switching keyboard layout

  - by szx

  Sometimes when I switch layout using either Alt+Shift or Ctrl+Shift the Alt key is not recognized as being released thus if I press e.g. F a File menu opens up. Last time that happend I lost all data I filled into a text form on a webpage because I pressed the Home key while typing and Firefox suddenly went to my home page! Moreoever, it still remains unreleased after hundreds of keypresses like if I'm holding it! Same goes for the Shift key. I would rather file a bug at Launchpad if I could but I have no clue what fucking package name should I type in the ubuntu-bug command! Have anyone else had this issue? Can you suggest a solution or maybe another place to report this bug?

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• Get collision details from Rectangle.Intersects()

  - by Daniel Ribeiro

  I have a Breakout game in which, at some point, I detect the collision between the ball and the paddle with something like this: // Ball class rectangle.Intersects(paddle.Rectangle); Is there any way I can get the exact coordinates of the collision, or any details about it, with the current XNA API? I thought of doing some basic calculations, such as comparing the exact coordinates of each object on the moment of the collision. It would look something like this: // Ball class if((rectangle.X - paddle.Rectangle.X) < (paddle.Rectangle.Width / 2)) // Collision happened on the left side else // Collision happened on the right side But I'm not sure this is the correct way to do it. Do you guys have any tips on maybe an engine I might have to use to achieve that? Or even good coding practices using this method?

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• From Imperative to Functional Programming

  - by user66569

  As an Electronic Engineer, my programming experience started with Assembly and continue with PL/M, C, C++, Delphi, Java, C# among others (imperative programming is in my blood). I'm interested in add to my previous knowledge, skills about functional programming, but all I've seen until now seems very obfuscated and esoteric. Can you please answer me these questions? 1) What is the mainstream functional programming language today (I don't want to get lost myself studying a plethora of FP languages, just because language X has the feature Y)? 2) What was the first FP language (the Fortran of functional programming if you want)? 3) Finally, when talking about pure vs. non pure FP what are the mainstream languages of each category? Thank you in advance

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• Skills to Focus on to land Big 5 Software Engineer Position

  - by Megadeth.Metallica

  Guys, I'm in my penultimate quarter of grad school and have a software engineering internship lined up at a big 5 tech company. I have dabbled a lot recently in Python and am average at Java. I want to prepare myself for coding interviews when I apply for new grad positions at the Big 5 tech companies when I graduate at the end of this year. Since I want to have a good shot at all 5 companies (Amazon,Google,Yahoo,Microsoft and Apple) - Should I focus my time and effort on mastering and improving my Java. Or is my time better spent checking out other languages and tools ( Attracted to RoR, Clojure, Git, C# ) I am planning to spend my spring break implementing all the common algorithms and Data structure out of my algorithms textbook in Java.

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• After reinstalling ATI graphics drivers, my keyboard and mous aren't working anymore

  - by Lifelike27

  On Ubuntu 11.04 I tried to install the open source drivers for my laptops ATI Mobility Radeon 5470M but I messed that up a bit and lost xserver. Now I've managed to solve that problem with this and by downloading the ATI proprietary drivers and install those manually. Now, when Ubuntu loads up I get to the login screen but I can't use my mouse or my keyboard (usb keyboard and mouse doesn't work either). If I use the recovery console, then login with that and then run 'startx'. I can login fine (though Unity doesn't show, the graphics seem to be working because it shows the fading animation of libnotify), but I can't type or move my mouse.

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• What job is better for a newbie, one that requires you to create a new program frequently, or something like software maintenance?

  - by MobileDev123

  One of my friends has just completed his college degree and is ready to join the programmers' world. Today he has two offers, one with new projects every time, and another with software maintenance. The remaining factors are not important to him, what he wants to know is which option is better? My experience goes with second option because my first job was the maintenance one and I could learn how my fellow programmers made mistakes while coding . But I soon switched to a new job which required me to create new project every time. I enjoyed both but I must admit that my first job has given me a more advantage today. But it's not necessary that my experience can give benefit to him. But I want to know what is general approach? If I have to give him final verdict on these two, what should I tell him? Edit Everybody deserves one up vote here, I am really learning a lot from you guys.

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• What do you look for when debugging deadlocks?

  - by Michael K

  Recently I've been working on projects that heavily use threading. I think that I'm OK at designing them; use stateless design as much as possible, lock access to all resources that more than one thread needs, etc. My experience in functional programming has helped that immensely. However, when reading other people's thread code, I get confused. I am debugging a deadlock right now, and since the coding style and design are different from my personal style, I am having a difficult time seeing potential deadlock conditions. What do you look for when debugging deadlocks?

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• i'm new in programming and need experts help [on hold]

  - by Hatem

  i'm pleased to find place full of experts who can help me i'm new in programming ,and i went to course about C# basics + SQL i want to learn WPF to work on my own desktop application project i dont know how to start ..i'm lost sometimes i open VS2012 put contols here and there ..then i feel i miss information so i stop feel depressed other times i open books like WPF4.5 unleashed and after while i get bored of reading and complexed expressions i face other times i go to youtube watch some videos after all i dont do anything right .. i dont know how to start what are right steps to be professional in programming? should i revise what i took in C# basics and sql?? i wish you provide me with clear steps to begin successfully i'm sorry if my question is open or in wrong place forgive me thank you all

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• Web api authentication techniques

  - by Steve

  We have a asp.net MVC web service framework for serving out xml/json for peoples Get requests but are struggling to figure out the best way (fast, easy, trivial for users coding with javascript or OO languages) to authenticate users. It's not that our data is sensitive or anything, we just want users to register so we can have their email address to notify them of changes and track usage. In our previous attempt we had the username in the URI and would just make sure that username existed and increment db tables with usage. This was super basic but we'd notice people using demo as a username etc so we need it to be a little more sophisticated. What authentication techniques are available? What do the major players use/do.

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• Getting older packages from ppa

  - by highsciguy

  Can I install an older version of a specific package from a ppa? Specifically, I want to get an older version of xserver-xorg-video-intel (and dependencies) from xorg-edgers ppa. The reason is that the older version seemed to work with my hardware. The present version seems to feature (I would like to found out if it is really the source) severe crashes as the present stable releases of this package do. I tried apt-get install pkg=version but didn't succeed. I am afraid that the packages in the cache are lost after apt-get clean I do not even know the precise version number of the previous version, assuming that it doesn't have to be exactly one less. The current version is xserver-xorg-video-intel-2.20.15 Alternatively: Is there a place, e.g. at launchpad, where I can manually download the previous version of the package?

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• Constructor should generally not call methods

  - by Stefano Borini

  I described to a colleague why a constructor calling a method can be an antipattern. example (in my rusty C++) class C { public : C(int foo); void setFoo(int foo); private: int foo; } C::C(int foo) { setFoo(foo); } void C::setFoo(int foo) { this->foo = foo } I would like to motivate better this fact through your additional contribute. If you have examples, book references, blog pages, or names of principles, they would be very welcome. Edit: I'm talking in general, but we are coding in python.

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• How can I customize an FPS game?

  - by monoceres

  I want to create a customized (modded) fps game where I can change the look and feel of the game to match my intended theme. Some of the things I would like to do: Create a custom map (terrain). Add custom sound effects Change AI (For example, running away instead of actively looking for combat). Change menus and add some storyboard. Script events in game (like a countdown until game over) Change the models of the NPC's. What options do I have? Is there any platform/game/engine/whatever that allows one to do the things above in a reasonable way? I work as a programmer so I'm not afraid of coding some part of the project, but to save time it would be nice to work in some high-level way (like scripting or configuration files).

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• Troubleshooting Blocked Transaction in SQL Server

  - by ChrisD

  While troubleshooting a blocked transaction issue recently, I found this code online.  My apologies in not citing its source, but its lost in my browse history some where.   While the transaction is executing and blocked, open a connection to the database containing the transaction and run the following to return both the SQL statement blocked (the Victim), as well as the statement that’s causing the block (the Culprit)   -- prepare a table so that we can filter out sp_who2 results DECLARE @who TABLE(BlockedId INT, Status VARCHAR(MAX), LOGIN VARCHAR(MAX), HostName VARCHAR(MAX), BlockedById VARCHAR(MAX), DBName VARCHAR(MAX), Command VARCHAR(MAX), CPUTime INT, DiskIO INT, LastBatch VARCHAR(MAX), ProgramName VARCHAR(MAX), SPID_1 INT, REQUESTID INT) INSERT INTO @who EXEC sp_who2 --select the blocked and blocking queries (if any) as SQL text SELECT ( SELECT TEXT FROM sys.dm_exec_sql_text( (SELECT handle FROM ( SELECT CAST(sql_handle AS VARBINARY(128)) AS handle FROM sys.sysprocesses WHERE spid = BlockedId ) query) ) ) AS 'Blocked Query (Victim)', ( SELECT TEXT FROM sys.dm_exec_sql_text( (SELECT handle FROM ( SELECT CAST(sql_handle AS VARBINARY(128)) AS handle FROM sys.sysprocesses WHERE spid = BlockedById ) query) ) ) AS 'Blocking Query (Culprit)' FROM @who WHERE BlockedById != ' .'

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• Applying for MS CS with an un-related Bachelor's Degree [closed]

  - by yeenow123

  I received a BA in Economics and went to work and started developing a passion for programming while on the job. This lead to learning more and more about computer science in general. I want to go for a Masters in Computer Science. I'm taking courses at the local college to get some of the undergrad CS courses out of the way (Data Structures etc.). However I'm not sure what to focus on for my application. Should I take the GRE for CS? A lot of college application procedures recommend it if you didn't go to undergrad for CS. Should I try to improve my GRE general test? I took it a month after college ended and got mediocre scores, so I could definitely study a bit harder and improve my scores. Anything else that's necessary? My current job is not exactly in a related field, but I do get to do some programming/coding.

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• Images not indexed by google since moving to cdn

  - by dfunkydog

  Last week I moved all the images on coffeeandvanilla.com to a cdn( maxcdn.coffeeandvanilla.com ). The problem I'm having is that although the sitemap—generated by yoast wordpress seo plugin—points images to the correct location, google only indexes[sic] images from the category and page site maps but 0 images from the posts sitemap( see screenshot https://dl.dropbox.com/u/4635252/sitemap.png ) This website has been doing quite well with google image-search before the change, visits from google image search have dropped from ~200/day to 11 yesterday Here is an example entry from the generated posts.xml sitemap http://pastebin.com/vcMRf9VW Can anyone suggest where the problem lies? Why have I lost all my google image juice? Should I just wait some more, how long before really worrying?

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• What should you include in a development approach document?

  - by Liggy

  I'm in the middle of co-producing a "development approach" document for off-shore resources as they ramp up onto our project. The most recent (similar) document our company has used is over 80 pages, and that does not include coding standards/conventions documents. My concern is that this document will not be consumable and will therefore fail. What should be in a development approach document? Are there any decent guidelines on this topic? EDIT: The development approach document should detail the practices and techniques that will be used by software developers while software is designed, built, and tested.

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• Techniques to increase logic at programming

  - by u3050

  I am into programming since last 3 years. But I seems to be lost in it. I am not able to get good at it even though I code everyday. suppose I solve one problem, I will wander from solution to solution and implement some other solution. I cant focus much. I get many defects for the code I write. I afraid of code I dont know why if I dont finish it on time my boss will fire me etc. I enjoy coding but not all the time. How to increase patience? I always wonder how do I become the best coder like many exceptional programmers. I know this sounds subjective but I think this will help programmer community to get good at it especially for average like me or beginner programmers.

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• Python simulation-scripts architecture

  - by Beastcraft

  Situation: I've some scripts that simulate user-activity on desktop. Therefore I've defined a few cases (workflows) and implemented them in Python. I've also written some classes for interacting with the users' software (e.g. web browser etc.). Problem: I'm a total beginner in software design / architecture (coding isn't a problem). How could I structure what I described above? Providing a library which contains all the workflows as functions, or a separate class/module etc. for each workflow? I want to keep the the workflows simple. The complexity should be hidden in the classes for interacting with the users' software. Are there any papers / books I could read about this, or could you provide some tips? Kind regards, B

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