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  • Coexisting installation of visual studio 2010 &2008

    - by yCalleecharan
    Hi, I currently have MVS2008 and I want to try the 2010 version hoping that it would compile C programs faster. I would like to know if I can have a 2008 installation coexisting with a 2010 installation on the same Windows partition, without conflicts in the Windows environment variables in Win XP. Thanks a lot...

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  • Floating point vs integer calculations on modern hardware

    - by maxpenguin
    I am doing some performance critical work in C++, and we are currently using integer calculations for problems that are inherently floating point because "its faster". This causes a whole lot of annoying problems and adds a lot of annoying code. Now, I remember reading about how floating point calculations were so slow approximately circa the 386 days, where I believe (IIRC) that there was an optional co-proccessor. But surely nowadays with exponentially more complex and powerful CPUs it makes no difference in "speed" if doing floating point or integer calculation? Especially since the actual calculation time is tiny compared to something like causing a pipeline stall or fetching something from main memory? I know the correct answer is to benchmark on the target hardware, what would be a good way to test this? I wrote two tiny C++ programs and compared their run time with "time" on Linux, but the actual run time is too variable (doesn't help I am running on a virtual server). Short of spending my entire day running hundreds of benchmarks, making graphs etc. is there something I can do to get a reasonable test of the relative speed? Any ideas or thoughts? Am I completely wrong? The programs I used as follows, they are not identical by any means: #include <iostream> #include <cmath> #include <cstdlib> #include <time.h> int main( int argc, char** argv ) { int accum = 0; srand( time( NULL ) ); for( unsigned int i = 0; i < 100000000; ++i ) { accum += rand( ) % 365; } std::cout << accum << std::endl; return 0; } Program 2: #include <iostream> #include <cmath> #include <cstdlib> #include <time.h> int main( int argc, char** argv ) { float accum = 0; srand( time( NULL ) ); for( unsigned int i = 0; i < 100000000; ++i ) { accum += (float)( rand( ) % 365 ); } std::cout << accum << std::endl; return 0; } Thanks in advance!

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  • Windows application data directory

    - by Stefan
    With the environment variable %allusersprofile% I can get the directory where common settings are stored. But most programs store their settings in the sub-folder "anwendungsdaten" (German, application data). Is there a way to get the direct path to this folder? The problem is that its name is language dependent. Thanks.

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  • What's the best way to trim std::string

    - by Milan Babuškov
    I'm currently using the following code to right-trim all the std::strings in my programs: std::string s; s.erase(s.find_last_not_of(" \n\r\t")+1); It works fine, but I wonder if there are some end-cases where it might fail? Of course, answers with elegant alternatives and also left-trim solution are welcome.

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  • Is LuaJIT really faster than every other JIT-ed dynamic languages?

    - by Gabriel Cuvillier
    According to the computer language benchmark game, the LuaJIT implementation seems to beat every other JIT-ed dynamic language (V8, Tracemonkey, PLT Scheme, Erlang HIPE) by an order of magnitude. I know that these benchmarks are not representative (as they say: "Which programming language implementations have the fastest benchmark programs?"), but this is still really impressive. In practice, is it really the case? Someone have tested that Lua implementation?

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  • Where is the VM in LLVM?

    - by anon
    Note: marked as community wiki. Where is the Low Level Virtual Machine in LLVM? I see that we have llvm-g++ and c-lang, but to me, a LLVM is something almost like Valgrind of a simulator, where instructions are executed on it, and I can write programs to instrument the running code / interrupt when certain conditions happen / etc ... Where are the tools like this built on LLVM? Thanks!

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  • Python Mindstorms RCX

    - by Kyle Schmidt
    I've got 30 unopened Lego Mindstorms kits that I'd love to use in my intro programming class to do some simple robotics stuff at the end of the year. We're using Python in the class, so I'd prefer there to be a way for the kids to write the programs in Python. Unfortunately, these are old kits with RCX bricks - not the newer NXT ones, so most of the projects like NXT_Python can't help me. Is there any way to make that happen?

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  • New functional languages

    - by AnnaR
    Functional programming has been around since at least 1958 (creation of Lisp), but is experiencing a renaissance now with old functional languages being dusted off and new functional languages being created. Which functional languages are there that are newly developed or are in the making? I realize that you can write purely functional programs in most high level languages, so with functional languages I imply languages that are specifically designed for functional programming such as F#. If you have links to tutorials, wikis or code examples I encourage you to add them to your answer!

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  • Program compiled with MSVC 9 won't start on a vanilla SP3 XP

    - by jemper
    I installed XP on a virtual machine, updated it to SP3 and then tested a small program compiled with Visual C++ 2008 on my real computer - however it didn't start but outputted only an error saying that a problem had been detected and that a reinstall of the application (mine is 10KB in size and doesn't even have an installation) could fix the problem. What is required to run programs compiled with MSVC 9? Can I just include some dlls for it to work everywhere?

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  • Channel Audio from .mp4?

    - by Kyle
    Hi there. I am at a loss here after searching around with no results. I am attempting to channel the audio specifically from an .mp4 for use in a driver. I am aware that there are programs which extract the audio from .mp4's, but I am looking for another approach without using external applications such as those.. is there any direction that someone can point me towards to solve this problem? Thanks, -K

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  • Simulate Photoshop's saturation changes in Imagemagick

    - by Ambirex
    In Photoshop you can adjust the hue, saturation and lightness of an image with three sliders. ImageMagick you can modulate the brightness, saturation, and hue. Minimizing the saturation correctly produces a black and white image in both programs. Maxing out the saturation appears close, but ImageMagick appears to soften some of the blown out edges while Photoshop will expose more the the compression artifacts. How can I accurately reproduce Photoshop's saturation changes from within ImageMagick, or other command line tool.

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  • stringstream problem - vector iterator not dereferencable

    - by andreas
    Hello I've got a problem with the following code snippet. It is related to the stringstream "stringstream css(cv.back())" bit. If it is commented out the program will run ok. It is really weird, as I keep getting it in some of my programs, but if I just create a console project the code will run fine. In some of my Win32 programs it will and in some it won't (then it will return "vector iterator not dereferencable" but it will compile just fine). Any ideas at all would be really appreciated. Thanks! vector<double> cRes(2); vector<double> pRes(2); int readTimeVects2(vector<double> &cRes, vector<double> &pRes){ string segments; vector<string> cv, pv, chv, phv; ifstream cin("cm.txt"); ifstream pin("pw.txt"); ifstream chin("hm.txt"); ifstream phin("hw.txt"); while (getline(cin,segments,'\t')) { cv.push_back(segments); } while (getline(pin,segments,'\t')) { pv.push_back(segments); } while (getline(chin,segments,'\t')) { chv.push_back(segments); } while (getline(phin,segments,'\t')) { phv.push_back(segments); } cin.close(); pin.close(); chin.close(); phin.close(); stringstream phss(phv.front()); phss >> pRes[0]; phss.clear(); stringstream chss(chv.front()); chss >> cRes[0]; chss.clear(); stringstream pss(pv.back()); pss >> pRes[1]; pss.clear(); stringstream css(cv.back()); css >> cRes[1]; css.clear(); return 0; }

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  • What Easter Eggs have you placed in code?

    - by Scott
    I know it is illegal to place Easter eggs in code via Microsoft's quarrel with the law a few years back. Microsoft has decided that if you place Easter eggs in code, it is an immediate grounds for termination, but they are still out there in the wild. I know I put my name in the code a lot that will never show up to the users, but it is always fun to do. So, what Easter eggs have you seen or placed in your programs/code? One of mine was: Query = [Current_Step] = 'Scott Rocks'

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  • Win32 API prevent standby

    - by bobobobo
    What is the Win32 api function that prevents the system from going into standby? Some programs use it, which is pretty annoying in my opinion. I know there's a couple of WM_SYSCOMMAND messages you can trap to prevent the screensaver from coming on..

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  • Command line semaphore utility

    - by compie
    I want to write a command line utility that can be used to synchronize the execution off programs in different consoles. Console A: $ first_program && semaphore -signal Console B: $ semaphore -wait && second_program The first program takes a long take to complete. The second program can only start when the first program has finished. Which synchronization object do I need to implement this (in Python)?

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  • Multithreaded Haskell

    - by Ingdas
    Hi I'm learning Haskell and I'd like to write some multithreaded programs now to see the performance gains from that in a functional language. I can find some references to it on the internet but never a proper introduction to it. Can anyone point me to a guide which is understandable for someone who knows the syntax fairly well, but is not a wizard in Haskell?

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  • Where has XamlPad gone in .NET 4.0 / Windows SDK v7.1 / Visual Studio 2010?

    - by elck03
    I can't find XamlPad anywhere after I installed .NET 4.0 / Visual Studio 2010 and Windows 7 SDK - v7.1. I tried searching C:\Program Files\Microsoft SDKs\Windows\v7.1\bin and did a dir /s xamlpad.exe to see if the Windows Index service didn't get to that folder yet. And it's not under Start Menu - All Programs - Windows SDK v7.1 -- Tools. Where has it gone? Did MS deprecate it? Thanks

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  • Anyone have a current list of what BizSpark offers?

    - by chobo2
    Hi I am looking at bizspark but the page with the software seems outdated. I am wondering if anyone has a current list or can confirm if that is the current list. http://www.bizspark.com/v2/Programs/Pages/BizSpark_Software_and_Tools.aspx Like it still say you get Vs 2008? How about 2010? What version of 2010? How many licenses?

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  • Core dump of a multithreaded program

    - by benjamin button
    Hi, i have regularly worked with single threaded programs. i never saw a multithreded program crashing since i havent worked on any. is there any difference between both teh core dumps? is there any additional information provided in the core dump of a multithreaded program when compared to a single threaded program?

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  • programming from a usb stick, .net

    - by dean nolan
    I was wondering if there was a way I could program and compile .net applications (c#, asp.net mvc) from a usb stick on any laptop I plugged in. I am lookinjg for a solution that does not have me installing programs on the laptop, so I have to be able to run an ide or editor from an exe and compile presumably from command line. Was also wondering if I can run MS test projects from command line to check tests passed etc. Thanks

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  • Virtual microphone, networks and vb.net

    - by Jonathan
    I would like to add a virtual microphone (similar to how you can have a virual CD drive and then mount ISO files on it.) so that it can be selectable in programs like MSN and skype. But have the source of the audio be streamed from over a network(I know how to stream the audio over the network in VB.net) but how do I get that audio which has been streamed as the input to the virtual microphone? Jonathan

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  • Virtual microphone, networks and vb.net

    - by Jonathan
    I would like to add a virtual microphone (similar to how you can have a virual CD drive and then mount ISO files on it.) so that it can be selectable in programs like MSN and skype. But have the source of the audio be streamed from over a network(I know how to stream the audio over the network in VB.net) but how do I get that audio which has been streamed as the input to the virtual microphone? Jonathan

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