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• Are all languages basically the same?

  - by Anirudh

  Recently, i had to understand the design of a small program written in a language i had no idea about (ABAP, if you must know). I could figure it out without too much difficulty. I realize that mastering a new language is a completely different ball game, but purely understanding the intent of code (specifically production standard code, which is not necessarily complex) in any language is straight forward, if you already know a couple of languages (preferably one procedural/OO and one functional). Is this generally true? Are all programming languages made up of similar constructs like loops, conditional statements and message passing between functions? Are there non-esoteric languages that a typical Java/Ruby/Haskell programmer would not be able to make sense of? Do all languages have a common origin?

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• Ubuntu 11.10 logs off when clicking shutdown

  - by Rourke

  As the title says: when I click Shutdown from the menu it logs off. When I click shutdown from the log-in menu it does nothing. I'm using a fresh install of Ubuntu 11.10. I can force it to shutdown by the command below, but I don't want to keep typing that whenever I want to shutdown my laptop. sudo shutdown -h now So it's probably processes which arn't closing. I'm a novice linux user, so I have no idea how to rule out the software causing this. I think it's either Gwibber/Empathy, perhaps Mozilla Thunderbird, because this is happening since I started using this. So a few questions: How do I rule out what software is causing this? How do I stop it from not closing on shutdown? If 1. and 2. don't work is it possible to add top command to the shutdown process? Edit: Rourke here. Somehow I cannot accept the below comment from mech-e as the solution. Thank you this was indeed the answer I was looking for!

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• When should one use the Abstract, Implements, or extends keywords?

  - by kdavis8

  I'm just now moving from a beginner to intermediate level android programmer in the java language. i can successfully write a game framework of classes that work together to accomplish a task beyond basic things, like hello world. but i'm having issues with some pretty basic OOP concepts; When should i derive from an abstract class? When is it more efficient to use an Interface instead of simply sub classing a parent? Basically, between extends, implements, and the abstract keywords, which keywords should be used instead of the others? i'm not looking for a basic definition, as i know them. i need to no when and why i should apply them to my code? what advantages does one have over the other? which is best for game development?

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• Computer Science Fundamentals - Recommended books

  - by contactmatt

  Hey, I'm looking to see if anyone can recommend any books in fundamentals of computer science. I obtained my associates degree as a programmer/analyst a couple years ago and I know a good amount about programming on the .NET framework. I'm even certified on the .NET 4 framework as a web application developer. However, since I was only able to obtain my associates degree, I was deprived at my college on the low-level basics and operations of computers and basic computer science information. I'm really interesting in learning about the low-level operations of a computer and in programming (bytes, bits, memory management, etc.) Can anyone recommend any good computer science books for someone who is decently experienced in programming? Thank You

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• Help migrating from VB style programming to OO programming [closed]

  - by Agent47DarkSoul

  Being a hobbyist Java developer, I quickly took on with OO programming and understood its advantages over procedural code from C, that I did in college. But I couldn't grasp VB event based code (weird, right?). Bottom-line is OOP came natural to me. Curently I work in a small development firm developing C# applications. My peers here are a bit attached to VB style programming. Most of the C# code written is VB6 event handling code in C#'s skin. I tried explaining to them OOP with its advantages but it wasn't clear to them, maybe because I have never been much of a VB programmer. So can anybody provide any resources: books, web articles on how to migrate from VB style to OO style programming ?

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• Installing W2K8 R2 on a Dell Poweredge 2850

  - by DerekT

  I'm a server novice and have been given a Dell 2850 (PERC 4e/Di). It has 3 blank HDs that I think are configured as RAID 5. I am trying to install W2K8 R2 SP1 on it. It doesn't have a DVD reader so I created an install USB. This works fine until it's time to copy files to the HD. It can't see a HD. There is an option to browse for drivers at this stage. Any idea what drivers I need and where to download them? I downloaded this driver RAID_DRVR_WIN_R227150.EXE but this failed with invalid signature. Thanks to dyasny for the link to LSI-LOGIC_MULTI-DEVICE_A00_R227150.exe.

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• Resources for Virtual Machine programming

  - by good_computer

  I am a beginner (a little more than that) programmer of C. I am really interested in the field of Virtual Machines. When I read about the Python VM, the PyPy project, the advancements in JVM technology, Google V8, the Erlang VM, I really get excited about these amazing pieces of technology, and really want to get my hands dirty building them or contributing to one of these projects. I need to know.. what are the things (language, concepts, algorithms, math, etc?) I need to know/learn to be able to build a virtual machine any books or other resources that will be helpful career prospects for a virtual machine engineer (but this is least important for me for now) (one more side question: somewhere I'd read something like JVM is on the cutting edge of virtual machine technology -- that it is the most advanced VM so far -- is that true?) Please give me a LONG answer detailing all that you know.

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• Backtrack My "Education"

  - by perl.j

  About a year or so ago, I decided to start programming. I really, just jumped into a language (Perl) and went from there. What I regret is that I just jumped in: I didn't learn the basics (if you would call them basics). I didn't learn about Computer Science. This issue, I believe, is holding me back. Where should I "restart"? Are there any books, articles, etc. that I should read? Are there any topics an experienced programmer should know? What's your advice? Thanks! Please don't advise me to take a college/high-school class.

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• Common mistakes made by new programmers without CS backgrounds [on hold]

  - by mblinn

  I've noticed that there seems to be a class of mistakes that new programmers without CS backgrounds tend to make, that programmers with CS backgrounds tend not to. I'm not talking about not understanding source control, or how to design large programs, or a whole host of other things that both freshly minted CS graduates and non-CS graduates tend to not understand, I'm talking about basic mistakes that having a CS background will prevent a programmer from making. One obvious and well trod example is that folks who don't have a basic understanding of formal languages will often try to parse arbitrary HTML or XML using regular expressions, and possibly summon Cthulu in the process. Another fairly common one that I've seen is using common data structures in suboptimal ways like using a vector and a search function as if it were a hash map. What sorts of other things along these lines would you look out for when on-boarding a batch of newly minted, non-CS programmers.

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• Best way to start Game development? [on hold]

  - by SupSon ?

  I'm a web developer. I got skills in PHP, CSS HTML. I also have a little bit of knowledge about JS. I want to get into game development to be a better programmer overal. I just want to start by making a simple platform game. Some kind of very simple mario clone. What is the best way to start the process of gamedevelopment? I know code is just code, but when thinking about starting my own little game, i do not exactly know where to start looking. Some opinions on this would be awsome!

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• Will learning ColdFusion help me advance my programming skills? [closed]

  - by chhantyal

  Currently I am working with a small web development company. We use jQuery on front-end, Coldfusion for back-end and MySQL as our database. We just started to use HTML5 and CSS3. This is my first internship and job. I know the basics of Python and want to add Django or Ruby on Rails on my skills set. In addition, I want to advance my programming skills with Machine Learning, Compilers, NoSQL and Unix Hacking. I also find front end web development pretty interesting. Should I focus on front-end and become skilled on HTML5/CSS3/Javascript? Or dive into back-end learning ColdFusion. I will probably leave the company after a year since I want to work with great product start-ups. And I live in India, where ColdFusion is not popular. Will learning ColdFusion help me become better programmer?

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• What is the best C++ interview question?

  - by David Thielen

  If you could ask a C++ programmer one question to measure their C++ skills, what would it be? The question I think is best is: Can you call "delete this;" inside a member function? (I put this as a link so you can think it through first, then go to The Best C++ Interview Question – Ever! to see the correct answer.) I don't ask this because I expect most people to know the answer. If they did it would not be that useful a question. I ask to see if they can work their way to the correct answer and how they do so.

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• I have deleted python files in usr/bin and cant reinstall it

  - by Plonkaa

  I am a novice at Ubuntu and unfortunately i have deleted 3 files in the usr/bin folder python 2.7 python python 2.6 Now my update manager wont work and when i type in python into gnome it says that it is no longer there. Please help me ive tried loads of different things but it just wont work. The closest i got was the following: I typed in sudo apt-get -f install and i thought i had fixed it but then i got a error message - Reading package lists... Done Building dependency tree Reading state information... Done The following packages were automatically installed and are no longer required: gir1.2-folks-0.6 gir1.2-polkit-1.0 libcogl5 mutter-common gir1.2-json-1.0 libcaribou0 gir1.2-accountsservice-1.0 gir1.2-clutter-1.0 gir1.2-gkbd-3.0 gir1.2-networkmanager-1.0 caribou libcogl-common libmutter0 gir1.2-mutter-3.0 gjs gir1.2-caribou-1.0 libclutter-1.0-0 gir1.2-telepathylogger-0.2 libclutter-1.0-common cups-pk-helper gir1.2-upowerglib-1.0 gir1.2-cogl-1.0 libmozjs185-1.0 gir1.2-telepathyglib-0.12 gir1.2-gee-1.0 libgjs0c gnome-shell-common Use 'apt-get autoremove' to remove them. The following extra packages will be installed: ubuntu-sso-client The following packages will be upgraded: ubuntu-sso-client 1 upgraded, 0 newly installed, 0 to remove and 35 not upgraded. 2 not fully installed or removed. Need to get 0 B/57.7 kB of archives. After this operation, 16.4 kB of additional disk space will be used. Do you want to continue [Y/n]? y Setting up python-minimal (2.7.2-7ubuntu2) ... /var/lib/dpkg/info/python-minimal.postinst: 4: python2.7: not found dpkg: error processing python-minimal (--configure): subprocess installed post-installation script returned error exit status 127 Errors were encountered while processing: python-minimal E: Sub-process /usr/bin/dpkg returned an error code (1) any advice is appreciated!

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• Recommendation for Improving Programming Skills

  - by Moaz ELdeen

  I'm 25, I know C++ syntax since 9 years.. but It seems that I have copied so much code, and I didn't learn that much and didn't solve a lot of algorithms in my own. Currently I'm working for computer vision programmer as a junior and I have difficulity of doing algorithms like blob tracking or object tracking, writing algorithms like KNN, Quadtree,..etc. I don't know what to do, or what to improve, I tried to write asteriods game, I have finished it, and here you can watch it https://www.youtube.com/watch?v=jw0L4aCB4TU What should I do more to enhance my skills ?

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• At what size of data does it become beneficial to move from SQL to NoSQL?

  - by wobbily_col

  As a relational database programmer (most of the time), I read articles about how relational databases don't scale, and NoSQL solutions such as MongoDB do. As most of the databases I have developed so far have been small to mid scale, I have never had a problem that hasn't been solved by some indexing, query optimization or schema redesign. What sort of size would I expect to see MySQL struggling with. How many rows? (I know this is going to depend on the application, and type of data stored. the one that got me thing was basically a genetics database, so would have one main table, with 3 or 4 lookup tables. The main table will contain amongst other things, a chromosome reference, and a position coordinate. It will likely get queried for a number of entries between two potions on a chromosome, to see what is stored there).

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• How to handle coworker with "obsessive refactoring disorder"

  - by ThuneGrill

  My coworker (who is very clever, but with severly limited inter-personal skills), keeps refactoring my code even when it is work in progress and assigned to me as a task. Whereas I fully subscribed to the idea of collective ownership of code, I find this extremely irritating, but attempts to have him stop seem to have no effect. My analysis of his personality is that he considers himself the best, and if it had not been for him, the codebase would have been in a mess. I should add that I am not a novice, I know my skills and I produce quality work. Some of the refactorings are indeed to the better, most are basically just introduction of a style that he likes better than mine. In addition, he has a almost child-like need to have the last word in any discussion and has never any word of praise for work done by co-workers. There is always something that he, the master, would have done differently. I feel this is strongly affecting the quality of my work-life. What should I do ?

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• Why do game engines convert models to triangles compared to keeping it as four side polygon

  - by Grant

  I've worked using maya for animation and more film orientated projects however I am also focusing on my studies on video game development (eventually want to be either programmer or some sort of TD with programming and 3D skills). Anyways, I was talking with one of my professor and we couldn't figure out why all game engines (that I know of) convert to triangles. Anyone happen to know why game engines convert to triangles compared to leaving the models as four sided polygons? Also what are the pros and cons (if any) of doing this? Thanks in advance.

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• How to work with scenes in a 2D game

  - by Anearion

  I'm a java/android programmer, but I don't have any experience in game programming, I'm already reading proper books, like "Pro Android Games", but my concerns are more about the ideas behind game programming than the techniques themselves. I'm working on a 2D game, something like Cluedo to let you understand the genre. I would like to know how should I act with the "scenes", for example, a room with a desk, TV, windows and a lamp. I need to make some items tappable and others not. Is it common to use one image (invisible to the user) with every different item a different color, then call the getColor() method on the image? Or use one image as background, and separate images for all the items? If the latter, how can I set the positioning? and should I use imageView or imageButton? I'm sorry if those are really low quality questions, but as "outsider" ( I'm 23 and still finishing my university ) it's pretty hard learn alone.

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• Beginning with shell scripting

  - by Kevin Wyman

  I am fresh into Ubuntu and one of my goals is shell scripting for personal (and maybe public) use. I'm a novice, though I do understand some of the basics (e.g. what a variable, string, loop, etc... is) but to get the most of scripting I need to learn in-depth. I figure the best way to do that is to jump right into scripting and ask questions only pertinent to the stage I am at in my attempted script. Scenario: I have edited my sudoers file to allow my non-root user to run sudo commands without being prompted for a password. Question: In vim, what would be the best code to use for a function that checks whether this condition is [true], If not, prompt the user if they want the script to edit and save the sudoers file to make this condition [true]? Layout - If condition is true, carry-on with rest of script. If condition is not true, the script silently edits/adds the line: %sudo ALL=(ALL:ALL) NOPASSWD: ALL in the sudoers file, saves and then continues on with the next part of the script. Any help with this would be greatly appreciated and assist me in my journey to writing shell scripts.

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• vpn/Openvpn as a cloud service

  - by 8pipe

  I am working on creating a small cloud (any number of EC2 instances that can be deployed based on load) implementing a VPN as a service for the company I'm working for. This is basically a project gathering together various vpn resources under one aegis as a cloud based service. As a user of openvpn, I'm somewhat familiar with being able to connect, but I'm looking for resources to start this project. Essentially I need to be able to: run a certificate authority and manage keys to distribute to coworkers build an ami that handles openvpn as a service balance the load if necessary among machines instances as needed Any suggestions for tutorials, things to avoid, roadblocks I might not be seeing from a novice perspective, etc. or just help in visualizing this is appreciated.

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• What is the best way to pass data into an API from a website?

  - by Chris Wakoksi

  My main objective is to create a User Interface in order to provision(change the status: activate, deactivate, or suspend) modems. I have received a SOAP developer's guide to the specific type of modem that helps out with the specific values that I need to pass into Iridium's WSDL but I cannot figure out how to do this from a webpage I have created using HTML/CSS, and PHP? I have been told by others that I need to know the portal. I have no idea what that means. I am a beginner programmer who has learned programming for this project. Any suggestions as to how to pass my data into the provisioning API?

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• Is it safe StringToHash() to use in Unity?

  - by Sebastian Krysmanski

  I'm currently browsing through the Unity tutorials and saw that they're recommending to use Animator.StringToHash("some string") to created unique ids for animation properties (see here). Since I'm a programmer, to me the word "hash" doesn't represents something unique. Like the Java documentation for hashValue() states: It is not required that if two objects are unequal [...], then calling the hashCode method on each of the two objects must produce distinct integer results. So, according to this (and my definition of "hash"), two strings may have the same hash value. (You can also argue that there are an infinite number of possible strings but only 2^32 possible int values.) So, is there a possibility that StringToHash() will give me an id that actually belongs to another property (than the one I requested the hash for)?

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• Know a little of a lot or a lot of a little? [closed]

  - by Jeff V

  Possible Duplicate: Is it better to specialize in a single field I like, or expand into other fields to broaden my horizons? My buddy and I who have been programming for 13 years or so were talking this morning and a question that came up was is it better to know a little of a lot (i.e. web, desktop, VB.Net, C#, jQuery, PHP, Java etc.) or is it better to know a lot of a little (meaning expert in something). The context of this question is what makes someone a senior programmer? Is it someone that has been around the block a few times and has been in many different situations or one that is locked in to a specific technology that is super knowledgeable in that one technology? I see pro's and con's of both scenarios.. Just wondering what others thought.

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• Avast Antivirus Crashes

  - by user67966

  Well I have installed avast anti virus on Ubuntu 12.04. But after updating, it crashes! So I have made some tweaks like below: 1) I pressed press Ctrl+Alt+T and opened Terminal. When it opened, I ran the command below. sudo gedit /etc/init.d/rcS 2) typed my password and hit enter 3) when the text file opens add the line: sysctl -w kernel.shmmax=128000000 4) made sure the line you added is before: exec /etc/init.d/rc S 5) This is how it should look like: Code: #! /bin/sh # rcS # # Call all S??* scripts in /etc/rcS.d/ in numerical/alphabetical order # sysctl -w kernel.shmmax=128000000 exec /etc/init.d/rc S 6) save it 7) Reboot My question is. Did I do anything wrong. I mean as I have made some tweaks,will it lower the security of avast down like viruses do! Please if you are a programmer check this if it contains bug or harmful intentions...Thanks.

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• C# Concisely by Judith Bishop &amp; Nigel Horspool

  - by MarkPearl

  In my quest to read all the books I have lying on my bookshelf I have finally got round to finishing C# Concisely (ISBN 0-321-15418-5). While this book was fairly old, I found it to be quite useful for a student wanting to learn C# for the first time, and a nice way to review and make I hadn’t missed something when I was learning the language. The book is simple and explains the basic concepts in a clean manner, but is really intended for the beginner programmer – it also had a few chapters dedicated to winforms, which was an indication of its age. None the less, I will keep it on the bookshelf so when I come across someone who is wanting to learn the language I can give them it as a gift.

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