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• Learning Objective-C. Using Xcode 3.2.1. What is error: Program received signal: “EXC_ARITHMETIC”.

  - by derry

  I am learning Objective-C using Stephen Kochan's excellent book "Programming in Objective-C 2.0". I am new also to Xcode. So far all my exercises have worked fine, but when I run program 7.6 FractionTest on page 153 I get the console message "Program received signal: "EXC_ARITHMETIC". The status shows that the program succeeded, but I don't see any output. Can anybody suggest what I might be doing wrong?

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• Languages for implementing decision trees

  - by Shailesh Tainwala

  What would be a good choice of programming language in which to implement a decision tree? The results of the implementation will be for personal use only, so no need to consider ability to publish etc. I have heard that Octave is a good option, can anyone explain why a matrix based language is recommended for implementing decision trees?

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• Is there any Genetic Programing code written R

  - by Charlie Epps

  I'm interesting in evolutionary algorithms. I have tested genetic algorithms with R but has someone tried with genetic programming? Do you know, if there are code somewhere written in R.

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• Does Lua support Unicode?

  - by TimK

  Based on the link below, I'm confused as to whether the Lua programming language supports Unicode. http://lua-users.org/wiki/LuaUnicode It appears it does but has limitations. I simply don't understand, are the limitation anything big/key or not a big deal?

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• Why BASIC had numbered lines?

  - by Helltone

  I'm curious about why early versions of the BASIC programming language had line numbering like in: 42 PRINT "Hello world!" The text editors back then had no line numbering?

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• Convert keyboard layout from AZERTY to QWERTY

  - by lamisse

  I'm programming in Java using a French machine with an AZERTY keybord. I like to type text with a certain character, the colon, test: hello. When I launch the test, only test is displayed. Are there ways in Java to convert the colon : to the QWERTY equivalent?

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• Is LUA a language that a non-developer can learn quickly?

  - by Brian T Hannan

  Let's say a tester is to do some programming to create automated tests ... is LUA really easy to learn for someone who is not a developer?

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• Longest Hello, World! program without whitespace?

  - by Koning Baard XIV

  I was just wondering, what could possibly be the largest amout of code possible to write a Hello, World! program, without repeating code, without any whitespace, as few newlines as possible, whitout code that doesn't need to be there, and not written in 'Shakespeare'? Programming language doesn't matter ^^

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• Send email from windows application (C++)

  - by Stan

  I am programming a process monitoring tool which is written in C++, windows application. Is there anyway to send out alert email when the tool find the process go down? Any library support this? or any solution is fine. Thanks.

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• The simplest concurrency pattern

  - by Ilya Kogan

  Please, would you help me in reminding me of one of the simplest parallel programming techniques. How do I do the following in C#: Initial state: semaphore counter = 0 Thread 1: // Block until semaphore is signalled semaphore.Wait(); // wait until semaphore counter is 1 Thread 2: // Allow thread 1 to run: semaphore.Signal(); // increments from 0 to 1 It's not a mutex because there is no critical section, or rather you can say there is an infinite critical section. So what is it?

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• What is Chain Matrix Multiplication ?

  - by Hellnar

  Hello, I am trying to understand what is a chain matrix multiplication and how it is different from a regular multiplication. I have checked several sourcers yet all seem to be very academically explained for me to understand. I guess it is a form of dynamic programming algorithm to achieve the operation in an optimised way but I didn't go any further. Thanks

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• Can a programme assign the memory directly?

  - by Tattat

  Is there any really low level programming language that can get access the memory variable directly? For example, if I have a programme have a variable i. Can anyone access the memory to change my programme variable i to another value?

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• Which term to use when referring to functional data structures: persistent or immutable?

  - by Bob

  In the context of functional programming which is the correct term to use: persistent or immutable? When I Google "immutable data structures" I get a Wikipedia link to an article on "Persistent data structure" which even goes on to say: such data structures are effectively immutable Which further confuses things for me. Do functional programs rely on persistent data structures or immutable data structures? Or are they always the same thing?

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• Explain Type Classes in Haskell

  - by Tsubasa Gomamoto

  Hi, I am a C++ / Java programmer and the main paradigm I happen to use in everyday programming is OOP. In some thread I read a comment that Type classes are more intuitive in nature than OOP. Can someone explain the concept of type classes in simple words so that an OOP guy like me can understand it?

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• Can you make a living as a system programmer?

  - by Helper Method

  Is there still a market for C system programmers? I love Java and some of the newer JVM languages but at the same time I really enjoy low-level system programming under Unix, using C and the GNU toolchain (it makes you feel elitist ;-)). Now I wonder a) is there still a market for C system programmers and b) how much do you earn compared to an app programmer c) is it that much fun in a large scale project?

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• Font selection for codes in a book

  - by Mehper C. Palavuzlar

  Which font or fonts should be used while writing code lines inside a book? I'm especially dealing with C code, but I'd also like to know what fonts are used for the codes of popular programming languages in books.

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• Editors to draw diagrams in Unified Modeling Language ?

  - by Tim

  I was wondering how you draw diagrams in Unified Modeling Language for your project design? By hand on paper or some editors on computer? It will be great if there are some convenient editors or other gadgets for help. I am programming under Windows and Ubuntu. Thanks and regards!

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• Post bacc CS certificate of Java Certification?

  - by gwozdz

  I have a BS in biology, MS in Environmental Science, but I've been writing software in C++ and Java throughout grad school and a bit in my current job. I'd love to transition to a programming career. I've thought about getting what's called a "Post baccalaureate Certificate" or Java certification in lieu of another degree in CS. Which is more useful in terms of getting a job?

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• Lambda functions

  - by Oden

  Hey, I'm really interested in the way of using lambda functions. Does it make sense to use them in a high-level programming language? If yes, why? Is this really just a function embedded in a function (like this) or is there more behind?

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• Can a program assign the memory directly?

  - by Tattat

  Is there any really low level programming language that can get access the memory variable directly? For example, if I have a program have a variable i. Can anyone access the memory to change my program variable i to another value?

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• OOP: class based and prototype based, are there other alternatives?

  - by Gabriel Šcerbák

  I know of class-based and protype based object oriented programming languages, are there any other alternatives? What are they?

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• Hi, I would like to know if anyone knows where to get some exercises of to practise

  - by Adomas

  I think small exercises would be the baest way for me to learn programming. I am the begginer and I am willing to give plenty of time to this. To explain, to my opinion exercises should be something to write not long programs (10-30lines), to say what the program will print or that is the mistake. Who can help me and say where to maybe a website with such stuff? Thanks

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• readin mib file using C

  - by Pubudu

  how i can read mib file in a router using cprogramming language or any other programming languages can you give me example source code? thanks

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• OK, SO, let's all do it and see how fun could this be?

  - by Galilyou

  In your favorite programming language, write a program that, when run, will print out its own source code! Sounds interesting, now let's go! ps: Literally, there is "NO" use case for this, just plain curiosity!

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• what is better when creating new variable in a loop in c++

  - by user63898

  hello in c++ what is better programming say i need to create new stl::map in each loop interation what will be better as poiner instance of as static instance for example for(int i=0;i<3;i++) { stl::map<int,int>* m = new stl::map<int,int>; or ... stl::map<int,int> m; }

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