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  • How do languages handle side effects of compound operators?

    - by Kos
    Hello, Assume such situation: int a = (--t)*(t-2); int b = (t/=a)+t; In C and C++ this is undefined behaviour, as described here: Undefined Behavior and Sequence Points However, how does this situation look in: JavaScript, Java, PHP... C# well, any other language which has compound operators? I'm bugfixing a Javascript - C++ port right now in which this got unnoticed in many places. I'd like to know how other languages generally handle this... Leaving the order undefined is somehow specific to C and C++, isn't it?

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  • Is there any valid reason radians are used as the inputs to trig function in many modern languages?

    - by johnmortal
    Is there any pressing reason trig functions should use radian inputs in modern programming languages? As far as I know radians are typically ugly to deal with except in three cases: (1) You want to compute an arc length and you know the angle of the arc and (2) You need to do symbolic calculus with trig functions (3) certain infinite series expansion look prettier if the input is in radians. None of these scenarios seem like a worthy justification for every programming language I am familiar with using radian inputs for Sin, Cos, Tangent, etc... The third one sounds good because it might mean one gets faster computations using radians (very slightly faster- the cost of one additional floating point multiplication ) , but I am dubious even of that because most commonly the developer had to take an extra step to put the angle in radians in the first place. The other two are ridiculous justifications for all the added obscurity.

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  • What languages allow cross-platform native executables to be created?

    - by JT
    I'm frustrated to discover that Java lacks an acceptable solution for creating programs that will run via double-click. Other than .NET for Windows, what modern and high-level programming languages can I write code in that can be compiled for various platforms and run as a native/binary in each (Windows, Linux, OSX (optional)) Assuming I wanted to write code in python, for instance, is there a cohesive way that I could distribute my software which wouldn't require users to do anything special to get it to run? I want to write and distribute software for computer-illiterate and Java has turned out to be a real pain in this respect.

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  • New or not so well-known paradigms, syntax features and behaviours of programming languages?

    - by George B
    I've designed some educational programming languages and interpreters for them, but my problem always was that they ended up "normal" and "boring", mostly similar to some kind of existing language (ASM and BASIC). I find it really hard to come up with new ideas for syntax features, "neat things" and new or very modified programming paradigms for it. I always thought that it was hard to come up with good new things not fun/useless new things for this case. I wondered if you could help me out with your creativity: What features in terms of language syntax and built-in functions as well as maybe even new paradigms can I work into my language to keep it useless but more fun, enjoyable, interesting and/or different to program in?

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  • Is there any Application Server Frameworks for other languages/platforms than JavaEE and .NET?

    - by Jonas
    I'm a CS student and has rare experience from the enterprise software industry. When I'm reading about enterprise software platforms, I mostly read about these two: Java Enterprise Edition, JavaEE .NET and Windows Communication Foundation By "enterprise software platforms" I mean frameworks and application servers with support for the same characteristics as J2EE and WCF has: [JavaEE] provide functionality to deploy fault-tolerant, distributed, multi-tier Java software, based largely on modular components running on an application server. WCF is designed in accordance with service oriented architecture principles to support distributed computing where services are consumed by consumers. Clients can consume multiple services and services can be consumed by multiple clients. Services are loosely coupled to each other. Is there any alternatives to these two "enterprise software platforms"? Isn't any other programming languages used in a bigger rate for this problem area? I.e Why isn't there any popular application servers for C++/Qt?

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  • Apache directory structure with multiple hosted languages.

    - by anomareh
    I just got a new work machine up and running and I'm trying to decide on how to set everything up directory wise. I've done some digging around and really haven't been able to find anything conclusive. I know it's a question with a variety of answers but I'm hoping there's some sort of general guidelines or best practices to go by. With that said, here are a few things specific to my situation. I will be doing actual development and testing on the same machine as the server. It is a single user machine in the sense that I will be the only one working on the machine. There will be multiple hosted languages, specifically PHP and RoR while possibly expanding later. I'd like the setup to translate well to a production environment. With those 3 things in mind there are a couple of things I've had in the back of mind. Seeing as it's a single user machine I haven't been able to decide whether or not I should be working on things out of my home directory or if they should be located outside of it. I'm feeling that outside of a user directory would be better as it would translate better to a production environment, but I'm also not sure if that will come with any permission annoyances or concerns seeing as I'll be working on the same machine. Hosting multiple languages seems like it may be a bit quirky. With PHP I've found you're generally just dumping the project somewhere in the document root where as something like a Rails app you have the entire project and you only want the public directory in the document root. Thanks for any insight, opinion, or just personal preference from experience anyone can offer.

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  • Where to set catch-all address in Postfix (virtual mailboxes in affect)

    - by Cem
    I successfully configured Postfix to deliver messages to virtual mailboxes. I can set aliases and pipes inside /etc/postfix/virtual and mailboxes inside /etc/postfix/virtual_mailbox files. However, whenever I set a catch-all domain and point to a remote email address, it overrides all other virtual mailboxes and virtual aliases set in postfix. How can I set a catch-all forwarding to the remote email address when virtual mailbox is enabled? I set catch-all like this: @mydomain.com [email protected] Thanks for your help!

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  • How to access an SD card from a virtual machine?

    - by Punit Soni
    I want to format an SD card from my Linux virtual machine. I have a built-in SD card reader in my laptop. I tried using VirtualBox and VMware Player and installed Ubuntu 10.04 guest. None of them are showing the SD card reader as a device. I can access the SD card from the Windows host. I am not interested in solutions using shared folders as I want to access the SD card as hardware (it should show up in /dev). I basically want to set up the SD card for BeagleBoard, but I don't want to install physical Ubuntu in my PC.

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  • Loading GUI on host machine through SSH with X11 forwarding

    - by cdated
    I've got applications on my host machine running fine by runnning: $ssh -X user@host Welcome to host $firefox Firefox proceeds to run in client display from the host machine. How do I get firefox to load on the host machine's display so I could remotely manage the host machine's running GUI applications? I need my application to load a GUI on a remote machine without walking to that machine.

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  • how do i upload virtual pc into a wesite using virtual server.

    - by ragu88
    dear friends, my school has given me a project on virtual pc and server. i am supposed to create a website with multiple virtual pcs in it.. students are supposed to go to the website and than to the virtual pc and do their lab experiments there... can i no how m i to do that and how do i upload a virtual pc into the website.. i m using ms virtual server 2005 r2.. Ragu

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  • More than one XP Mode virtual machines okay under Win 7?

    - by kousen
    I really like the Windows XP Mode virtual machine that comes with Windows 7 (once you download the integration components). I teach technical training classes, and having a machine configured for the classroom is very helpful. My question is, can I configure more than one? The documentation suggests you can make multiple virtual machines, but I can't tell if I can have multiple "Windows XP Mode" VMs. It can't be as simple as configuring one, then just making a copy of the primary disk file, could it? I only plan to run one at a time, but I'd like to configure multiple different VMs for different classes, all running XP if possible. Thanks for any help!

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  • How to make the free Microsoft Virtual Hard Disk image to work with VirtualBox's simulated network c

    - by Jian Lin
    I have a Macbook Pro at work and installed the current VirtualBox (3.2.4) today. However, after using the VHD image for IE 7 on XP SP3 on this: http://www.microsoft.com/downloads/details.aspx?FamilyID=21eabb90-958f-4b64-b5f1-73d0a413c8ef&displaylang=en The Virtual Operating System (XP) just thought there is no network card provided by the PC (the virtual PC simulated by VirtualBox), even if I set up 4 network cards in Settings, as NAT, host only, etc. So the XP cannot browse any webpage at all... Does any integration package need to be added for VirtualBox to make it work and how? (is VirtualBox providing a "too advanced" network card so XP SP3 doesn't have the driver for it? thanks.

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  • More than one XP Mode virtual machines okay under Win 7?

    - by kousen
    I really like the Windows XP Mode virtual machine that comes with Windows 7 (once you download the integration components). I teach technical training classes, and having a machine configured for the classroom is very helpful. My question is, can I configure more than one? The documentation suggests you can make multiple virtual machines, but I can't tell if I can have multiple "Windows XP Mode" VMs. It can't be as simple as configuring one, then just making a copy of the primary disk file, could it? I only plan to run one at a time, but I'd like to configure multiple different VMs for different classes, all running XP if possible. Thanks for any help!

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  • Deploying virtual machines - Windows Guest/Linux Host or vice versa?

    - by samoz
    I'm looking to deploy several virtual machines for users. They need access to both Windows and Linux. They also need to use the computers graphics card (for Photoshop, modeling, etc) under Windows. My question is, will an Ubuntu host/Windows guest or a Windows host/Ubuntu guest be faster? I'm somewhat worried about Windows getting a cluttered registry and slow, but on the otherhand, a Windows host would have direct access to hardware (Unless I'm just unaware of how to grant hardware access to a guest). Does the choice of software (VMware or VirtualBox) effect the choice?

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  • How to map a virtual desktop to a monitor in a multiple monitor setup?

    - by t3
    OS: Microsoft Windows Vista SP2, Microsoft Windows 7 My laptop is plugged to a docking station that supports dual monitors, which I use extensively. I have windows placed where I want them. All is well and predictable with this setup until I un-dock. The moment I un-dock all windows that I placed in the secondary monitor piles up in the primary monitor and it is an unholy mess. So, I am looking for a solution where if I use virtual desktops, one of them can be mapped to a monitor and when un-docked what was there in the secondary monitor stays in a virtual desktop. Do you folks know of a tool or workaround that can address my quandary?

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  • Access Virtual PC Website from Host Browser

    - by rams
    I have Virtual PC 2007 running Windows XP. I can access a website setup on the Virtual machine from a browser in the Virtual machine. How do I setup the virtual machine so I can access the website from a browser on the host machine. The host machine is also running WinXP. Both host and virtual machine can ping each other via IP and computer name. TIA rams

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  • Jack of all trades, master of none [closed]

    - by Rope
    I've got a question similar to this one: Is looking for code examples constantly a sign of a bad developer? though not entirely. I got off college 2 years ago and I'm currently struggling with a University study. Most likely I'll have to drop out and start working within the next couple of months. Now here's the pickle. I have no speciality what so ever. When I got out of college I had worked with C, C++ and Java. I had had an internship at NEC-Philips and got familiar with C# (.NET) and I taught myself how it worked. After college I started working with PHP, HTML,SQL, MySQL Javascript and Jquery. I'm currently teaching myself Ruby on Rails and thus Ruby. At my university I also got familiar with MATLAB. As you can see I've got a broad scope of languages and frameworks I'm familiar with, but none I know inside-out. So I guess this kinda applies to me: "Jack of all trades, master of none.". I've been looking for jobs and I've noticed that most of them require some years of experience with a certain language and some specifications that apply to that language. My question is: How do I pick a speciality? And how do I know if I'll actually enjoy it? As I've worked with loads of languages how would I be able to tell this is right for me? I don't like being tied down to a specific role and I quite like being a generalist. But in order to make more money I would need a specialisation. How would I pick something that goes against my nature? Thanks in advance, Rope.

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  • Oracle Technology Network Virtual Developer Day: Service Oriented Architecture (SOA)

    - by programmarketingOTN
    Register now! Oracle Technology Network Virtual Developer Day: Service Oriented Architecture (SOA) - Discover the Power of Oracle SOA Suite 11gTuesday July 12, 2011 - ?9:00 a.m. PT – 1:30 p.m. PT / 12 Noon EDT - 4:30 p.m. EDTOTN is proud to host another Virtual Developer Day, this time focusing on SOA (click here to check out on-demand version of Rich Enterprise Applications and WebLogic)  Save yourself/company some money and join us online for this hands-on virtual workshop. Through developer-focused product presentations and demonstrations delivered by Oracle product and technology experts, there is no faster or more efficient way to jumpstart your Oracle SOA suite learning.Over the course of the Virtual Developer Day, you will learn how an SOA approach can be implemented, whether starting fresh with new services or reusing existing services. Using Oracle SOA Suite 11g components, you will explore, modify, execute, and monitor an SOA composite application. Topics include SCA, BPEL process execution, adapters, business rules and more.Java and WebLogic experience not required for the presentations or demonstrations but it is a plus for the hands-on lab.Come to this event if you are    •    Exploring ways to deliver services faster    •    Integrating packaged and/or legacy applications    •    Developing service orchestration    •    Planning or starting new development projectsRegister online now for this FREE event.AGENDA - Tuesday July 12, 2011?9:00 a.m. PT – 1:30 p.m. PT / 12 Noon EDT - 4:30 p.m. PT EDT  Time  Title  9:00 AM Keynote  9:15 AM Presentation 1 Service Oriented Architecture (SOA) Overview  9:45 AM Demonstration 1 Mediator and Adapters  10:15 AM Presentation 2 BPEL Service Orchestration and Business Rules  10:45 AM Demonstration 2 BPEL Service Orchestration  11:15 AM Demonstration 3 Oracle Business Rules  11:45 AM Hands-on Lab time  1:30 PM Close Register online now for this FREE event.

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  • Java devs: why not use Groovy?

    - by FarmBoy
    OK, so there are quite a few people using Java these days. But as the language nears two decades of age, it isn't exactly the coolest option out there. Many of us are excited about dynamic languages with some functional features like Ruby or Python, even though we spend our days using Java. So why is it that the adoption of Groovy has been so slow? It seems that Groovy offers much of the benefits of Ruby and Python, but it is far easier to transition a Java shop to Groovy. Even if performance were the concern, it seems that many would want to use Groovy for testing the production Java code. Or use Groovy/Grails for internal apps in which performance concerns are minimal. Or for writing one-off scripts to generate code. Yet Groovy languishes outside of Tiobe's top 50 languages, for reasons that are unclear to me. I have been using Groovy and Grails professionally for about four months, and it has been an excellent experience, such that I hate to think about going back to the Java/Spring/Hibernate model. Does anyone have any sense on why we are not seeing more significant migration from Java to Groovy? Note that I'm not asking why Java developers are still using Java for new projects. My question is: Why is it that most Java Developers are still not using Groovy at all. Edit: I am assuming that all good developers see the utility of dynamic typing and higher order functions for some programming tasks. (Even if it is deemed inappropriate for production code.)

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  • Mod Rewrite - directing HTTP/HTTPS traffic to the appropriate virtual hosts

    - by kce
    I have an Apache2 web server (v. 2.2.16) running on Debian hosting three virtual hosts. The first two hosts are HTTP only (server1 and server2). The last host is HTTPS only (server3). My virtual host configuration files can be found at pastebin. I would like to use mod rewrite to get the following behavior: Any request for http://server3 is re-directed to https://server3 Any request for either https://server1 or https://server2 is re-directed to http://server1 or http://server2 as appropriate. Currently, requesting http://server3 gives you a 403 because indexing is disabled for that host and a request for https://server1 or https://server2 will resolve as https://server3 (as its the only virtual host running SSL). This behavior is not desirable. So far I have added a rewrite rule to the central configuration file (myServerWideConfs.conf), with unfortunately no effect. I was under the impression that this rule (or something similar) should rewrite all https:// requests for server1 and server2 to the proper http:// request. RewriteEngine On RewriteCond %{HTTP_HOST} !^server3 [NC] RewriteRule (.*) http://%{HTTP_HOST} My question is two-fold: What mod rewrite rules should I use to accomplish this? And where should they go? Debian's packaging of Apache has a pretty granular (i.e., fractured) configuration file layout; should my rewrite rules go in /etc/apache2/apache2.conf, /etc/apache2/conf.d/myServerWideConfs.conf, or the individual virtual host files? Is mod rewrite the right tool to accomplish this or am I missing something in my greater apache configuration?

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  • What are the factors affecting a new programming language?

    - by Saurav Sengupta
    I am developing a new general-purpose programming language of my own design. It's currently my own personal project. I have read of some experts saying that new languages do not usually survive (unfortunately I can't find a reference to that right now). What are the most substantial problems that a new language faces? The language syntax is similar to C/Python families, it does not use S-expressions, and it is an imperative language, but I'm doing first-class functions in it to provide the facilities of currying. In particular, I am concentrating on translating the source language to an intermediate language for execution by an interpreter, but I'm not in a position to translate to native code yet. What would be the issues with that? I've not personally used many non-native code languages, so I'm not well aware of the performance issues on today's machines. I also can't decide upon a lexer and parser generator. What would be the pros and cons of Flex and Yacc vs. hand-made? And what benefits will LLVM provide? I need to get the interpreter ready as quickly as possible. Finally, what factors will affect the language's use post release? I am planning a small library of essentials and full documentation for the first phase.

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  • What are the pros and cons about developing under MAC OS? [closed]

    - by user827992
    Sometimes i get the chance to program under MAC OS, i knew about this OS since Apple shipped its computers with a PowerPC by Motorola ( since Panther, more or less ), these days they are all X86 and i see no particular advantages about adopting this platform, also i see only downsides for the main part, i do not want to cause flames, please reply if you have a good answer or you can contribute in some constructive way. I'm trying to write a list of the natively supported languages, or the languages that comes only under MAC OS with some particular technology, my list is this: Objective C with Cocoa/Carbon I'm not considering personal preferences here, if a person X likes to code under Xcode it's probably ok to have a MAC, if a person Y likes to code under Visual Studio it's probably ok to not having a MAC, my purpose is to clarify what MAC OS is good for. I also do not get why people glorify the MAC for historical reasons, I mean a language like Java just comes for MAC only in the 7th edition of its JDK, things like GCC are just a porting and many technologies are out of the question like C# ( I'm sorry, i do not consider MonoDevelop like a serious alternative ) , .Net, ASP, DirectX, and many others are just, again, porting or free software, like PHP, MySQL, Javascript, XML, CSS, OpenGL, etc etc. My question is: what is so special about being a programmer under MAC OS? There is something that I have not seen? I also noticed that a significant portion of MAC users end up using their MAC like a normal Windows PC with Parallels or something like that. I can afford to buy a MAC, show me why this machine is so unique.

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  • Programming and Ubiquitous Language (DDD) in a non-English domain

    - by Sandor Drieënhuizen
    I know there are some questions already here that are closely related to this subject but none of them take Ubquitous Language as the starting point so I think that justifies this question. For those who don't know: Ubiquitous Language is the concept of defining a (both spoken and written) language that is equally used across developers and domain experts to avoid inconsistencies and miscommunication due to translation problems and misunderstanding. You will see the same terminology show up in code, conversations between any team member, functional specs and whatnot. So, what I was wondering about is how to deal with Ubiquitous Language in non-English domains. Personally, I strongly favor writing programming code in English completely, including comments but ofcourse excluding constants and resources. However, in a non-English domain, I'm forced to make a decision either to: Write code reflecting the Ubiquitous Language in the natural language of the domain. Translate the Ubiquitous Language to English and stop communicating in the natural language of the domain. Define a table that defines how the Ubiquitous Language translates to English. Here are some of my thoughts based on these options: 1) I have a strong aversion against mixed-language code, that is coding using type/member/variable names etc. that are non-English. Most programming languages 'breathe' English to a large extent and most of the technical literature, design pattern names etc. are in English as well. Therefore, in most cases there's just no way of writing code entirely in a non-English language so you end up with a mixed languages. 2) This will force the domain experts to start thinking and talking in the English equivalent of the UL, something that will probably not come naturally to them and therefore hinders communication significantly. 3) In this case, the developers communicate with the domain experts in their native language while the developers communicate with each other in English and most importantly, they write code using the English translation of the UL. I'm sure I don't want to go for the first option and I think option 3 is much better than option 2. What do you think? Am I missing other options?

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  • Windows Azure Virtual Machines - Make Sure You Follow the Documentation

    - by BuckWoody
    To create a Windows Azure Infrastructure-as-a-Service Virtual Machine you have several options. You can simply select an image from a “Gallery” which includes Windows or Linux operating systems, or even a Windows Server with pre-installed software like SQL Server. One of the advantages to Windows Azure Virtual Machines is that it is stored in a standard Hyper-V format – with the base hard-disk as a VHD. That means you can move a Virtual Machine from on-premises to Windows Azure, and then move it back again. You can even use a simple series of PowerShell scripts to do the move, or automate it with other methods. And this then leads to another very interesting option for deploying systems: you can create a server VHD, configure it with the software you want, and then run the “SYSPREP” process on it. SYSPREP is a Windows utility that essentially strips the identity from a system, and when you re-start that system it asks a few details on what you want to call it and so on. By doing this, you can essentially create your own gallery of systems, either for testing, development servers, demo systems and more. You can learn more about how to do that here: http://msdn.microsoft.com/en-us/library/windowsazure/gg465407.aspx   But there is a small issue you can run into that I wanted to make you aware of. Whenever you deploy a system to Windows Azure Virtual Machines, you must meet certain password complexity requirements. However, when you build the machine locally and SYSPREP it, you might not choose a strong password for the account you use to Remote Desktop to the machine. In that case, you might not be able to reach the system after you deploy it. Once again, the key here is reading through the instructions before you start. Check out the link I showed above, and this link: http://technet.microsoft.com/en-us/library/cc264456.aspx to make sure you understand what you want to deploy.  

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