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  • When to use C over C++, and C++ over C?

    - by Dark Templar
    I've been introduced to Computer Science for a little over a year now, and from my experience it seems that C and C++ are both considered one of the "ultrafast" languages out there, whereas others such as Python and such scripting languages are usually deemed somewhat slower. But I've also seen many cases where a software project or even a small one would interleave files where a certain number n of those files would be written in C, and a certain number m of those files would be written in C++. (I also noticed that C++ files almost always have corresponding headers, while C files not so much). But my main point of inquiry is to get a general sense of intuition on when it is appropriate to use C over C++, and when it is better to use C++ over C. Other than the facts that (1) C++ is object-oriented whereas C is not, and (2) the syntaxes are very similar, and C++ was intentionally created to resemble C in many ways, I am not sure what their differences are. It seems to me that they are (almost) perfectly interchangeable in many domains. So it would be appreciated if someone could clear up the situation! Thanks

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  • Media Hint Brings Hulu, Netflix, and Pandora to non-U.S. Residents

    - by Jason Fitzpatrick
    Chrome: If you’re outside the United States you know all too well how irritating it can be when you’re denied access to streaming services because of your location. Stop missing out and start streaming with Chrome extension Media Hint. So what’s the secret sauce? The extensions routes your traffic–just the traffic for the streaming service–through U.S.-based proxies so you can enjoy content unavailable in your home country. The extension requires no configuration or registration, simply install it and visit Hulu, Netflix, or Pandora to start streaming. Media Hint is a free extension, Chrome only. Media Hint [via Digital Inspiration] 6 Ways Windows 8 Is More Secure Than Windows 7 HTG Explains: Why It’s Good That Your Computer’s RAM Is Full 10 Awesome Improvements For Desktop Users in Windows 8

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  • Why does installing Grub2 give an "ISO9660: filesystem destruction..." warning?

    - by Ettore
    I have installed Ubuntu 12.04 on my computer, but at the end of the installation it gave me an error and it didn't install grub2. Now I'm trying to install it using the live cd: This is my sudo fdisk -l: Disk /dev/sda: 500.1 GB, 500107862016 bytes 255 heads, 63 sectors/track, 60801 cylinders, total 976773168 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 4096 bytes I/O size (minimum/optimal): 4096 bytes / 4096 bytes Disk identifier: 0x6af447e6 Device Boot Start End Blocks Id System /dev/sda1 * 2048 781459455 390728704 7 HPFS/NTFS/exFAT /dev/sda2 781459456 789272575 3906560 82 Linux swap / Solaris /dev/sda3 789272576 976773119 93750272 83 Linux After mounting and chroot the linux partiton, I give grub-install /dev/sda command, and I get: /usr/sbin/grub-setup: error: hd0 appears to contain a iso9660 filesystem which isn't known to reserve space for DOS-style boot. Installing GRUB there could result in FILESYSTEM DESTRUCTION if valuable data is overwritten by grub-setup (--skip-fs-probe disables this check, use at your own risk). (same error even with grub-install --recheck /dev/sda) What can I do? I also tried boot-repair, but I get this error: http://paste.ubuntu.com/1069353/

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  • About languages strongly typed with late binding, do they make sense?

    - by llazzaro
    I never learnt anything about VB6 (and I dont want to) but I wanted to search for bad things in computer software, so my first though was VB6. So for example, VB6 was strongly typed with late binding. Makes some sense to have a language with that combination? (I dont think so). I want to know reasons of why VB6 was like this! or why is good idea for a lenguage to be like this. Bad things that happend with a lengugage like this? good things?

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  • What is the history of why bytes are eight bits?

    - by DarenW
    What where the historical forces at work, the tradeoffs to make, in deciding to use groups of eight bits as the fundamental unit ? There were machines, once upon a time, using other word sizes, but today for non-eight-bitness you must look to museum pieces, specialized chips for embedded applications, and DSPs. How did the byte evolve out of the chaos and creativity of the early days of computer design? I can imagine that fewer bits would be ineffective for handling enough data to make computing feasible, while too many would have lead to expensive hardware. Were other influences in play? Why did these forces balance out to eight bits? (BTW, if I could time travel, I'd go back to when the "byte" was declared to be 8 bits, and convince everyone to make it 12 bits, bribing them with some early 21st Century trinkets.)

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  • Music player freezes when I switch to one of the terminal window until I login to that terminal

    - by Guanidene
    Whenever I switch to a terminal window from my X window, (by pressing Ctrl+Alt+1) my music player (banshee) running in X freezes until I login to the terminal window. Once I login into it (or either switch back to my X with or without logging into it) the music player resumes from the point it freezed. However, I observed that when am transferring files from my laptop to another computer over ssh and if I switch to one of the terminal windows, the transfer does not pause even if I don`t login to the termianl window. I just wanted to know what could possibly be the reason for such a discrimination.

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  • Relation between " lines of the longest working program " in a language and familiarity with it?

    - by Tim
    In some computer master program online application, it says: Please list the programming languages in which you have written programs. For each language, indicate the length in lines of the longest working program you have written in that language. You may approximate, but only count those parts of the program that you wrote yourself. I don't quite remember that, and I have never counted the lines of each program. Do programmers always know approximately how many lines in each of his programs, and keep record of them? What is the relation between " lines of the longest working program " in a language and familiarity with it? Typically, how many lines will indicate the programmer being excellent, good, fair, or unfamiliar with the language? Is knowing "lines of the longest working program" really helpful?

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  • Best strategy to discover a web service in a local network?

    - by Ucodia
    I am currently doing some research for a project. The setup is simple, I have a computer running a service in my home network and any device connected to that same network should be able to discover the service automatically and use it. I have no specific technology requirement whether it is on the server or client side. The client knows about the service definition. Other than that I have no idea what strategy to use, what technology to look at or whether I should go for a SOAP or a HTTP based service. I think going HTTP with REST API is the best for targeting all devices but I am opened to any suggestions. Thanks.

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  • Trouble with Ubuntu 12.10 install/evaluation

    - by Mike H
    I am trying to install Ubuntu 12.10 onto my Compaq Presario SR1215CL. I downloaded ubuntu-12.10-desktop-i386.iso file using BitTorrent and burned it to a blank DVD-RW. When I boot the computer with the Live Disk in the disk tray I am able to get to the Welcome screen. If I click on "Try Ubuntu" I am left at a blank screen except for the desktop background. There are no menus, toolbars, icons, etc. If I press Ctrl+Alt+Delete at this stage I am able to log out of the Live Session, but am unable to log back in. If I click on "Install Ubuntu" instead, I am able to proceed fairly far into the installation process, but eventually it quits and drops me to the same blank screen as above. I'm not sure at which stage the installer quits, but it does ask me to identify the issue and solve the problem myself from inside the Live Session, which doesn't work. Does anyone have some suggestions on how to get Ubuntu installed and working?

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  • How do I add pcie_aspm=force to my boot options?

    - by nargo7
    I just upgraded to 11.10 from 11.04 on my laptop (I don't have Windows) by downloading from the Ubuntu website. The laptop battery is in bad condition, but I was using it with the 11.04 plugged to AC all the time, and everything was fine. After installing 11.10, the laptop seems to not notice that it is connected to AC, so it shuts down a few minutes after starting. I read that I have to type pcie_aspm=force in the boot command, so I tried accessing it by pressing the "F6" key while booting, and then the other F keys, but nothing happened. I also found that I can write that instruction in the terminal window, but I don't know in which file or location. I would appreciate some help, but I am not a computer engineer, so please write the instructions in plain English.

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  • How Data Transfers differ on Smart Phones: Iphone vs. Android vs. Windows Phone

    - by MCH
    I am interested in how each individual smart phone is allowed to handle data transfers within a third-party app. I am interested in designing apps that allow customers to update, transfer, download, etc. data from their smart phone to their personal computer and vice-versa. (Ranging from just text, to XML, to a Relational Database) I only have experience with the Ipod Touch before and one particular app that maintained all the data on an online server, so to update the data on your pc or iphone you had to go online, are there other ways to do it? Like bluetooth, wireless LAN, USB, etc? I believe Apple has certain policies on this in order to control the App Store and individual Iphones. I suppose each company has a particular policy on how an app is allowed to transfer data to another system, does anyone have a good understanding of this? Thank you.

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  • How do I turn off all the password prompts?

    - by Barkerto
    I've been using Ubuntu 12.04 LTS since release and am trying to figure out a couple things about all of these passwords and key-ring prompts that I've just been living with for a while. Ever since install it seems that every time I boot up my computer and want to do anything (ie. use the internet, use a internet browser, install something, delete something, pick my nose) I'm always prompted for either a normal password entry or a key-ring password entry. Is there anyway to turn off all of this "security" and tell my Ubuntu that it can trust what I'm doing and go take a shower? Thank You in advance, barkerto

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  • Windows gets progressively slower over time, why doesn't Ubuntu?

    - by William
    I, and many other previous Windows users notice that the computer seems to get progressively slower over time. I bought a leapfrog crammer only to find it installed process that sat there waiting for me to plug the crammer in so it could run the software. It took up three percent of the CPU twenty-four seven, seven day a week! This is one of the main reasons I left Windows. But, Ubuntu doesn't seem to slow down over time at all. Does Ubuntu allow programs to install background programs like the leapfrog crammer did to sit there like a leech and suck away at resources? Could someone explain why Windows tends to get slower over time, and is Ubuntu vulnrable to this too? Thanks for any help, this is puzzling me.

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  • New 12.10 Install, Windows Not in Boot Menu

    - by Alex Samons
    I just installed Ubuntu 12.10 on my new computer alongside my previous Windows 7 installation. Upon booting for the first time (post install) my boot menu only lists Ubuntu. I installed using a liveCD, I had to set up my partitions myself because my Windows wasn't being detected (I set up the new partition out of free space on the drive.). I know Ubuntu did not overwrite my Windows because I can mount the Windows drive and access the files from here I also tried running boot-repair, as was recommended for people who didn't have Ubuntu showing up in the menu, but now I just have two different Ubuntu options. Still no windows. (if you require any additional data [logs, etc.], could you tell me how to find it, I am a bit new to this.) Any help is greatly appreciated, thank you.

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  • what is the Best way to learn object oriented principles

    - by Mike
    I am interesed in OOP principles and i found lots of documentations and books about it, for instance in C++, Java, .NET, PHP and so on, but if i only want to learn OOP principle, differences and not in language, what can i do? i want a good documentation, not just like a whole book about something except OOP :) specific answers, how it works, main features, pictures, or videos, or forum, or even stack... in every time I began studying i read a whole history of programming, computer science, software development and bla bla... i need specific answers, if it is possible i really need to learn, i need examples and exercises thanks in advance

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  • 12.04 Screen goes OFF and ON and hangs

    - by SKC
    i have installed ubuntu 12.04. while i'm using the screen goes off, comes back on (during which time, the system is not responsive) and this process repeats one more time in immediate succession after which the computer is responsive again. sometimes the system hangs indefinitely. sometimes the windows go blank. only the title bars are seen. i have tried re-installing the OS three times with no improvements. i have tried both 32 bit as well as 64 bit. i have no idea what the problem is and have tried hard to pin point that. i never had this prob till 11.10 my system config is as follow processor - 2nd gen intel core i7 (2660k) graphics - intel onboard HD graphics 3000 (no external graphics card) RAM - 4GB none of my friends seem to experience this problem. it really gets annoying as it happens really often. please advice

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  • Ghosting Program for Ubuntu 12.10

    - by Sean Webber
    I am looking to figure out how to set up a mass backup system for a computer network (of about 25) and am looking for a ghosting program that makes an image of the entire system for backup/recovery purposes. While clonezilla would work.. you have to manually boot us the CD for it. I am looking for a program that runs INSIDE Ubuntu that sends a system image backup off to the network server at set times, then when needed could also be used to burn the clone back to the machine. Another words- automatically and the only time I have to do anything to it is when I need to burn a backup BACK to a 'crapped' machine. Any ideas?

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  • Using an external hard drive as a server and be able to connect via wifi [on hold]

    - by user289228
    OK, so i have an old external HDD(seagate 1tb) and a windows computer just in case but im trying to set it up as a server for my home at the moment but if everything goes right i want to transfer it to being a database hub for the business i work for that way i can have more then one register at a time on the same basic database. The thing is im new to the whole server part along with im not well versed with ubuntu either so what im getting at is if i can get it setup, can i connect it on ubuntu and run a linux based Point of sales program but have multiple linked to the single server? i may be able to do it via the router, i think its a belkin n600 with usb port but at this moment i dont know what it is since im not home. i just need information if this is possible and if so, a guide would be appreciated.

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  • My system screen goes black and displays Term Signal Killed?

    - by Quandite
    My computer will often just die randomly while I am using it. The screen goes black and sometimes displays the words TERM signal killed along with other things and sometimes it displays nothing. The writing stays on the screen momentarily before it disappears to just black. I then have to hold in the power button to turn it off and then re boot. Here are the specs... help! Ubuntu 10.04(lucid) Kernel Linux 2.6.32-23-generic GNOME 2.30.2 memory 495.7 MiB processor Intel(R) Pentium(R) 4CPU 1.80GHz

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  • Why does the BADSIG/"Untrusted sources" error recur forever?

    - by Jeff McMahan
    On at least a dozen occasions, I've spent 2-3 hours figuring out how to get Ubuntu 11.10-12.10 to either update or acquire software from software center, or both. I want to fix whatever is causing the BADSIG problem once and for all; I've wasted so much time trying to get this to work well enough that I can rely on it, but the same problem comes back after a couple weeks of normal updates and software center usage. Don't refer me to a standard posted solution on the web---whatever it is, I've used it more times than you have. The question isn't whether I can get it to work right this afternoon. I can. The question is what is causing the problem to recur regularly across 3 releases. Notice: I use this computer 4-5 hours per week and I do little on it. PDFs, Latex, FireFox, Mendeley, and that's it. I don't constantly install new software, and I don't fiddle with things unnecessarily.

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  • hotkeys do not work sometimes in ubuntu 12.04

    - by stepank
    I use Ubuntu 12.04 with Unity 2D and I've stumbled upon this issue: sometimes shortcut keys stop working in some windows. For instance, I have these windows opened usually: Google Chrome, Terminal, Skype, Pidgin. Sometimes everything is OK and shortcuts work no matter what window I hit them from, however, hotkeys hit from Skype (more often) or Pidgin (less often) do not work, but they still work from Terminal or Google Chrome. Moreover, not all hotkeys are affected, the problem holds only for locking the computer (Ctrl + Alt + L) and other custom shortcuts like executing some command or launching a program (I used zenity --entry with [Super | Ctrl] + [some letter: K, N, etc] for testing). Does anyone have a clue what is causing the problem and how to fix it?

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  • Elantech trackpad being identified as a logitech wheel mouse

    - by user11895
    I recently purchased a Samsung RF510 laptop computer, which I absolutely love. However, upon installing Ubuntu 10.10 onto it I couldn't get the trackpad to function properly. It worked as a basic mouse (point and click) but had no functionality for edge scrolling or any of the multitouch settings the trackpad is capable of. After doing a lot of research I discovered the reason is a known issue where the Ubuntu kernel will improperly detect an Elantech trackpad as a logitech PS/2 wheel mouse, and as such will gain none of the functionality that seems to be coded for synaptics trackpads. The question I have is: does anyone know a way to get this working properly? This is my first time trying to run Ubuntu on a laptop (actually, it's my first laptop in the last 12 years) and I'm finding the experience to be intolerable without the basic scrolling/zooming/etc I've been used to using for as long as I can remember.

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  • GRUB not showing /dev/sda2 is Windows 7 Loader

    - by Ricardo
    A few days ago I accidentally deleted Ubuntu partition using GParted. I thought Windows 7 would start normally, but I got a "grub-rescue" screen instead. Then, I recreated a partition for Ubuntu (/dev/sda6) and reinstalled it. Ubuntu starts properly now; but GRUB shows me /dev/sda2 is Windows Recovery System (WRS), what is false, since /dev/sda1 is WRS and /dev/sda2 is Windows 7 Loader. I booted using Windows 7 disk and tried to correct this problem automatically and by bootrec.exe /fixboot and /fixmbr, and nothing is able to fix my problem. Yet, Windows (disk) says there is no OS in my computer. What should I do? Will I have to erase my hard disk to get Windows 7 back?

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  • No sound card detected [elementary os]

    - by Silouane Gerin
    h61 I set up a computer for my parents with elementary os. I installed an Asus P8H61-I motherboard which contains an integrated Realtek ALC887 sound card. The system doesn't recognize the sound card. Here are the results of some commands: lspci | grep audio doesn't return anything, alsa force-reload return Unloading ALSA sound driver modules: (none loaded). Loading ALSA sound driver modules: (none to reload). aplay -l no soundcard detected and cat /proc/asound/cards let me know that asound doesn't exist. I tried installing Realtek drivers but nothing happened. Here is a log from alsa : Log Can someone help me? Thanks.

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  • Programming language for simple program?

    - by jamherst
    I am wondering about which programming languages people see fit to create a program idea that I had. I am looking to create a fairly simple program whose main functions are adding to, managing, and searching through a database of people, all through a polished GUI. It will be for use in the business world, so I think Windows would be the priority, but Mac and Linux support wouldn't be bad. Also, eventually I would like to add the ability for an instance of one program on a computer to interact with other instances on the same network, mainly through the sharing of a database. Most of my experience is in Java, but I don't particularly like the appearance of Java GUIs, so I'm looking for an alternative. I noticed that a lot of people have suggested C++ or C# in similar posts, so what are some of the advantages/disadvantages of one or both if that is your suggestion. Thanks for any help in advance.

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