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• Implementing dynamic scope when using CPS as intermediate language

  - by asandroq

  I am currently studying the implementation of programming languages and became interested in using Continuation-Passing Style as the intermediate language of the compiler. I also want to implement limited dynamic scope (for exception-handling or Scheme parameter objects) but I cannot find the relevant literature. I think it can be done with a separate environment passed as a variable to every closure, but this solution seems ugly to me. Could anyone point me to the relevant literature, or give me an idea of how this can be done?

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• Select and delete selected

  - by Donator

  I am programming something like e-mail for my users. I want to allow people to select letters and delete selected. How can I do it? I can't imagine how can I do it only with one MySQL query. Is it even possible?

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• Where can I go to get help with, and advratise the new forum software I'm working on?

  - by William

  So I'm working on a new forum software, and I have no idea where I can go to get testers, and advertising. I really want testers to give me new ideas, discuss my current design, and tell me of any bugs/hacking exploits they find. Here's the software I'm talking about: http://prime.programming-designs.com/test_forum/

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• Literature and Tutorials for Writing a Ray Tracer

  - by grrussel

  I am interested in finding recommendations on books on writing a raytracer, simple and clear implementations of ray tracing that can be seen on the web, and online resources on introductory raytracing. Ideally, the approach would be incremental and tutorial in style, and explain both the programming techniques and underyling mathematics, starting from the basics.

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• How can I learn to set up a build process?

  - by Satoru.Logic

  Hi, all. What I was taught at school is all about programming languages, software design, but hardly anything about how to automatically build a software, probably with unit testing integrated. Please tell me how do one start learning to set up a build process for his project.

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• When would you put a semicolon after a method closing brace?

  - by froadie

  I've been programming in Java for a while, and I've just come across this syntax for the first time: public Object getSomething(){return something;}; What's interesting me is the final semicolon. It doesn't seem to be causing a compiler error, and as far as I know isn't generating runtime errors, so it seems to be valid syntax. When would I use this syntax? Or is it just something that is allowed but generally not used?

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• Python - create blacklist file of IP addresses that have more than 5 failed login attempts in the au

  - by oz_babe

  Basically I have an authlog/syslog file with a list of log in attempts and IP addresses - I need to make a Python program that will create a txt file with all the IP addresses that have more than 5 failed login attempts - a sort of "blacklist". So basically something like: if "uniqueipaddress" and "authentication failure" appear more than 5 times, add uniqueipaddress to txt file. Any help would be greatly appreciated - please try and make it simple as I am very, very inexperienced in programming in Python! Thanks.

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• MonoTouch - has anyone used this?

  - by Jonesy

  Hi folks, I'm a .NET developer trying to make the leap into objective-c iPhone programming. I created my first app - just a simple portfolio with multiple xibs. I've just come across MonoTouch which lets you develop iPhone apps in C# or .NET. Has anyone tried this out? I'd be interested to know people opinions on it. Cheers, Jonesy

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• Possibilities of powerbuilder 12

  - by snorlaks

  Hello, Im .net developer and I herad that since release 12 PowerBuilder enchanced integration with .net. I would like to know what are advantages using sybase powerbuilder over normlan wpf programming techniques and so on. When its recommended to use sybase powerBuilder ? thanks for help

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• Distributing WPF apps to a legacy user base: How seamless is it?

  - by Christian Nunciato

  I'm considering developing a WPF application, to be hosted by a legacy Windows app (C++), and I'm trying to get a better sense of how feasible it'll be to do so, given the broad user base I'm targeting. Knowing WPF targets .NET 3.5, I'm looking for some insight as to what the field looks like right now -- who's already got the runtime, whether it's distributed by Windows Update, if so, how (e.g., as an optional or required download, to which operating systems, etc.), whether XP pre-XP2 supports it (and how), and so on. The current version's got many thousands of users, using all manner of Windows operating systems, and while I'd very much like to leverage WPF to breathe some life into their user experience, I want to make sure I'm not shutting anyone out by doing so, or burdening them with a download they might have to do manually. I realize most, or all, of this information's out there already, in various places, but I figured I'd ask here first, since I'm sure some of you've probably already gone down this road and have valuable experiences to share. Thanks in advance!

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• Context Free Language Question (Pumping Lemma)

  - by Maixy

  I know this isn't directly related to programming, but I was wondering if anyone know how to apply the pumping lemma to the following proof: Show that L={(a^n)(b^n)(c^m) : n!=m} is not a context free language I'm pretty confident with applying pumping lemmas, but this one is really irking me. What do you think?

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• Java code for disabling the usb drive

  - by Navin

  I Want to know how to disable the usb drives through java programming,Can any one give the code for this or tell me the exact way to do this.............

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• Hidden features of Ruby

  - by squadette

  Continuing the "Hidden features of ..." meme, let's share the lesser-known but useful features of Ruby programming language. Try to limit this discussion with core Ruby, without any Ruby on Rails stuff. See also: Hidden features of C# Hidden features of Java Hidden features of JavaScript Hidden features of Ruby on Rails (Please, just one hidden feature per answer.) Thank you

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• starting with android

  - by Woland

  I am considering to start writing apps for android. Could some-one post list with all tools needed to start coding. My programming skills by language are C# - excellent Java - moderate c/c++ - beginner I have heard something about Mono for android, whats the status of it? is it any good? Also it would be helpful to hear how Java performs on android. Any other points and issues regarding the android platform are also welcomed.

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• data directory in automake

  - by Alex Farber

  I have some data files that should be distributed with my program. Using dist_pkgdata_DATA in Makefile.am, I get these files installed to /usr/local/data/share/package-name. The problem is that data is read-only, and my program needs to modify it. Playing with dist_sharedstate_DATA, dist_localstate_DATA, dist-data_DATA varibles, I got different installation directories, like /usr/local/com, usr/local/var, but data is always read-only. How can I distribute modifiable data files with my package? I need some common directory for all users, or maybe local data in a user directory.

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• a good smart phone for java development?

  - by pstanton

  Hi all, I'd like to do some development of smart phone apps and my native programming language is java. The first application I'd like to write will need to be able to (attempt to) connect to a network (LAN or WiFi) automatically in the background (on a schedule). would an android phone be the best path or are there competitive purer java options?

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• Efficiency of while(true) ServerSocket Listen

  - by Submerged

  I am wondering if a typical while(true) ServerSocket listen loop takes an entire core to wait and accept a client connection (Even when implementing runnable and using Thread .start()) I am implementing a type of distributed computing cluster and each computer needs every core it has for computation. A Master node needs to communicate with these computers (invoking static methods that modify the algorithm's functioning). The reason I need to use sockets is due to the cross platform / cross language capabilities. In some cases, PHP will be invoking these java static methods. I used a java profiler (YourKit) and I can see my running ServerSocket listen thread and it never sleeps and it's always running. Is there a better approach to do what I want? Or, will the performance hit be negligible? Please, feel free to offer any suggestion if you can think of a better way (I've tried RMI, but it isn't supported cross-language. Thanks everyone

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• Worst technobabble you've ever heard

  - by pookleblinky

  Following the Egregious pop culture perversion of programming, what is the most outlandishly insane technobabble you have ever heard, either in fiction or real life? Extra points to those unfortunates whose real life stories beat Hollywood. Note: feel free to sketch out what would be necessary for such gibberish to actually work.

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• Factory Method and Cyclic Dependancy

  - by metdos

  If I'm not wrong, because of its nature in factory method there is cyclic dependency: Base class needs to know subclasses because it creates them, and subclasses need to know base class. Having cyclic dependency is bad programming practice, is not it? Practically I implemented a factory, I have problem above, even I added #ifndef MYCLASS_H #define MYCLASS_H #endif I'm still getting Compiler Error C2504 'class' : base class undefined And this error disappers when I remove subclass include from base class header.

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• jumping lines in a file using c

  - by Nadav Stern

  hello i am trying to sort a textual file using c programming language, in order to sort the file i am using a unique key, i need to be able to jump from line to line in order to sort the file , the problem is that i do not know if there is a command in c which let me jump from the first line to lets say the 20 line for example the only solution which i know for it is to use each time fscanf with a loop but this solution is not very effective thanks in advance for your time.

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• golang closure variable scope

  - by waaadim

  I'm reading 'CreateSpace An Introduction to Programming in Go 2012' and on page 86 I found this evil magic func makeEvenGenerator() func() uint { i := uint(0) return func() (ret uint) { ret = i i += 2 return } } // here's how it's called nextEven := makeEvenGenerator() fmt.Println(nextEven()) fmt.Println(nextEven()) fmt.Println(nextEven()) 1) Why is i not resetting ? 2) is nextEven() returning and uint or is Println so smart that it can work with everything ?

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• What is a good Java web crawler library?

  - by DrDee

  Hi, I am about to develop a crawler in Java but don't feel like reinventing the wheel. A quick Google search gives a whole bunch of Java libraries to build a web crawler. Besides that Nutch is of course a very robust package but seems a bit too advanced for my needs. I only need to crawl a handful websites a week containing a couple of 1000 pages each. Which open source Java library would you recommend considering: speed multithreading (or even distributed) extending it with new functionality active maintained and documentation?

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• C# OOP File Structure?

  - by Soo

  Hey SO, I just started programming with objects recently and am trying to learn good habits early on. The way I plan to structure my application is to have two files: 1: Program.cs - This file will contain the main logic for the application 2: Class.cs - This file will contain all of the class definitions Pretty simple. What I'm wondering if I should have any more files for ... well, you tell me. Any help would be appreciated.

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• software engineer self improvment [closed]

  - by radi

  hi all , i am a 4th year student at software engineering department , at my faculty we study software engineering basics (unified process , uml , design patterns ) , so : what about these technics ? do i need to learn another (or new such as agile) ? what about programming languages (frameworks) ? what i need to learn ? why ? thanks

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• Mathematica, PDF Curves and Shading

  - by Venerable Garbage Collector

  I need to plot a normal distribution and then shade some specific region of it. Right now I'm doing this by creating a plot of the distribution and overlaying it with a RegionPlot. This is pretty convoluted and I'm certain there must be a more elegant way of doing it. I Googled, looked at the docs, found nothing. Help me SO! I guess Mathematica counts as programming? :D

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