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• What are modern and old compilers written in?

  - by ulum

  As a compiler, other than an interpreter, only needs to translate the input and not run it the performance of itself should be not that problematic as with an interpreter. Therefore, you wouldn't write an interpreter in, let's say Ruby or PHP because it would be far too slow. However, what about compilers? If you would write a compiler in a scripting language maybe even featuring rapid development you could possibly cut the source code and initial development time by halv, at least I think so. To be sure: With scripting language I mean interpreted languages having typical features that make programming faster, easier and more enjoyable for the programmer, usually at least. Examples: PHP, Ruby, Python, maybe JavaScript though that may be an odd choice for a compiler What are compilers normally written in? As I suppose you will respond with something low-level like C, C++ or even Assembler, why? Are there compilers written in scripting languages? What are the (dis)advantages of using low or high level programming languages for compiler writing?

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• SSAS 2008 backup/restore fails with a GetOverlappedResult 'Insufficient system resources exist to co

  - by Anant Aneja

  Hi, On my SSAS 2008 instance if a backup/restore of any database is made to/from a UNC path I get an error : The following system error occurred from a call to GetOverlappedResult for Physical file: '\server\share\OLAPDB.abf', Logical file: '' : Insufficient system resources exist to complete the requested service. . Server: The operation has been cancelled. (Microsoft.AnalysisServices) Creating/copying/moving a file on the share of any size on the share using explorer or the command prompt works. The most useful link I could find is : http://www.tech-archive.net/Archive/Development/microsoft.public.win32.programmer.kernel/2004-07/0475.html Can anyone shed more light on what could be causing this error ? (I've posted the same question on the SSAS forums - just a heads up)

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• Python Tkinter - Edit external object within event handler?

  - by M3RPHY

  Hey all, As the title says, I'm grabbing the cursor location within a motion triggered event handler in Tkinter. I'd like to update an existing label widget with the location, however I cannot for the life of me figure out how to edit the label's text field (or any external object for that matter) within the event handler. From what I understand, event is the only argument passed to the handler, which means I can't pass the label object. How do I access objects outside of the handler? Apologize for the noobish question as I'm a C programmer new to Python. Thanks!

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• how u guys learn coding and programming

  - by dramasea

  Hi, I am a newbie on programming and currently still learning. Can you contribute your opinion on how to learn that faster. I learn every single element of the language such as Javascript date object methods and properties: http://www.w3schools.com/jsref/jsref_obj_date.asp but it is pretty much all the same, should i read through it? or i just left it. You know that's very boring with just reading. So, can I ask those professional programmer, do you also read these when you learn programming?

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• Python 3.1.1 Class Question

  - by Protean

  I'm a new Python programmer who is having a little trouble using 'self' in classes. For example: class data: def __init__(self): self.table = [] def add(self, file): self.table.append(file) data.add('yes') In this function I want to have table be a variable stored in the class data and use add to modify it. However, when I run this script it gives me the error: Traceback (most recent call last): File "/Projects/Python/sfdfs.py", line 7, in <module> data.add('yes') TypeError: add() takes exactly 2 positional arguments (1 given) I assume that I am trying to call the function the wrong way in this instance, as this syntax is very similar to an example in the python documentation: http://docs.python.org/3.1/tutorial/classes.html

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• On Android, click to expand list -and- click on a button?

  - by Aurora

  I have just started my career as an android programmer, and am currently relying heavily on the sample code and api examples. I have been working with this api example, to produce an expandable list of items (note this example does not use the ExpadableListView). In playing with the example, I tried to add another widget that would become visible and be gone at the same time as the text (mDialogue in the sample code). This works well with another TextView, but as soon as I tried to add a button widget, it stopped working. The list would expand on first click, showing my hidden TextView and Button, but it will not disappear on further clicks. The button is however, clickable, and I was able to set up an onClick listener to change the button text back and forth. I'm starting to wonder, is it just not possible to have a clickable item inside a clickable list item? Or is there some kind of work around? Would it solve my problem if I used ExpandableListView?

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• LaTeX: Default font(s) for greek letters?

  - by Marco

  I'm a programmer but new to (La)TeX. As far as I can tell, neither the Computer Modern nor Latin Modern fonts have glyphs for the full greek alphabet. I installed (OS X) a Latin Modern font that came with TeX Live (lmroman10-regular.otf). As you can see in the attached image, the lowercase greek letters (and nabla) are displayed (TextEdit) using some default font. Also shown in the image is LaTeXiT displaying pretty lowercase greek letters that seem to be Latin-Modern-Italic-ish. So what font(s) are used by LaTeX for greek (and math symbols)? Where would I find them in the TeX fonts directory? Image: http://imgur.com/dvyyB.png

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• naive bayesian spam filter question

  - by Microkernel

  Hi guys, I am planning to implement spam filter using Naive Bayesian classification model. Online I see a lot of info on Naive Bayesian classification, but the problem is its a lot of mathematical stuff, than clearly stating how its done. And the problem is I am more of a programmer than a mathematician (yes I had learnt Probability and Bayesian theorem back in school, but out of touch for a long long time, and I don't have luxury of learning it now (Have nearly 3 weeks to come-up with a working prototype)). So if someone can explain or point me to location where its explained for programmers than a mathematician, it would be a great help. PS: By the way I have to implement it in C, if you want to know. :( Regards, Microkernel

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• How can I make a grid of clickable images from a list of data in WPF?

  - by mico

  Hello, I am a seasoned C and Java programmer, but an absolute WPF newbie. I am creating a kiosk application that will display a list of images of products that the user will click to see product details and maybe place an order. I am trying to structure my app with MVVM Foundation because I am used to the benefits of structure and tests. I wonder what is the most natural way to create a grid of clickable images that will fill the screen left to right, top to bottom (or the other way round, I have no exact requirements). Any image should be bound to an object that will become current and be displayed in the next screen. Thanks for your help.

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• Objective-C (iPhone) Memory Management

  - by Steven

  I'm sorry to ask such a simple question, but it's a specific question I've not been able to find an answer for. I'm not a native objective-c programmer, so I apologise if I use any C# terms! If I define an object in test.h @interface test : something { NSString *_testString; } Then initialise it in test.m -(id)init { _testString = [[NSString alloc] initWithString:@"hello"]; } Then I understand that I would release it in dealloc, as every init should have a release -(void)dealloc { [_testString release]; } However, what I need clarification on is what happens if in init, I use one of the shortcut methods for object creation, do I still release it in dealloc? Doesn't this break the "one release for one init" rule? e.g. -(id)init { _testString = [NSString stringWithString:@"hello"]; } Thanks for your helps, and if this has been answered somewhere else, I apologise!! Steven

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• UIPickerView with NSDictionary

  - by Dave

  I am a .NET programmer and new to Objective C. I am trying to make a UIPickerView which acts like a .NET dropdownlist. User sees the list of text and selects one and the selected value (which is the ID) is used in code. I have been browsing for almost half a day trying to figure this out. I could add a regular PickerView with list of strings, picker view with mulitple components and picker view with dependent components none of which seems to answer my query. Please help.

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• Writing Android apps in C#

  - by JamesBrownIsDead

  I'm a C# programmer and want to write an Android app. I'm a stubborn curmudgeon and refuse to write Java ever again (after switching to C# six years ago). Besides Mono and MonoDroid (and writing Java), are there any options for me? Or should I just feel foolish for refusing to returning to my Java roots? (Please refrain from Java-related vs. C# discussion. I was being rhetorical when I asked about returning to me Java roots.)

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• How is GroupOn website programmed?

  - by Maxi Garcia

  Hello world! This is my first time on Stackoverflow.com and it's great to be here! I need some expert programmer out there to tell me how the GroupOn's platform operates, from the programming point of view. Which are the most complex features it has and what technology do they use? If I were about to start learning programming languages, what should I learn to create a site like GroupOn.com? Is there any website where I can learn the basic principles for free? I appreciate your advices. Thanks in advance!

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• Compile-time lookup array creation for ANSI-C?

  - by multiproximus

  A previous programmer preferred to generate large lookup tables (arrays of constants) to save runtime CPU cycles rather than calculating values on the fly. He did this by creating custom Visual C++ projects that were unique for each individual lookup table... which generate array files that are then #included into a completely separate ANSI-C micro-controller (Renesas) project. This approach is fine for his original calculation assumptions, but has become tedious when the input parameters need to be modified, requiring me to recompile all of the Visual C++ projects and re-import those files into the ANSI-C project. What I would like to do is port the Visual C++ source directly into the ANSI-C microcontroller project and let the compiler create the array tables. So, my question is: Can ANSI-C compilers compute and generate lookup arrays during compile time? And if so, how should I go about it? Thanks in advance for your help!

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• Noob-Ready Cython Tutorials

  - by spearfire

  I know a bunch of scripting languages, (python, ruby, lua, php) but I don't know any compiled languages like C/C++ , I wanted to try and speed up some python code using cython, which is essentially a python - C compiler, aimed at creating C extensions for python. Basically you code in a stricter version of python which compiles into C - native code. here's the problem, I don't know C, yet the cython documentation is aimed at people who obviously already know C (nothing is explained, only presented), and is of no help to me, I need to know if there are any good cython tutorials aimed at python programmers, or if I'm gonna have to learn C before I learn Cython. bear in mind I'm a competent python programmer, i would much rather learn cython from the perspective of the language I'm already good at, rather than learn a whole new language in order to learn cython. 1) PLEASE don't recommend psyco edit: ANY information that will help understand the oficial cython docs is useful information

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• Usng Rails ActiveRecord relationships

  - by Brian Goff

  I'm a newbie programmer, been doing shell scripting for years but have recently taken on OOP programming using Ruby and am creating a Rails application. I'm having a hard time getting my head wrapped around how to use my defined model relationships. I've tried searching Google, but all I can come up with are basically cheat sheets for what has_many, belongs_to, etc all mean. This stuff is easy to define & understand, especially since I've done a lot of work directly with SQL. What I don't understand is how to actually used those defined relationships. In my case I have 3 models: Locations Hosts Services Relationships (not actual code, just for shortening it): Services belongs_to :hosts Hosts has_many :services belongs_to :locations Locations has_many :hosts In this case I want to be able to display a column from Locations while working with Services. In SQL this is a simple join, but I want to do it the Rails/Ruby way, and also not use SQL in my code or redefine my joins.

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• What way to use the CGContext to draw is suitable?

  - by Tattat

  I know that the CGContext cannot call it to draw directly, and it needs to fill the drawing logic in the drawInContext, and call the CGContext to draw using "setNeedsDisplay", so, I designed a cmd to execute, but it cause some problems... like this : http://stackoverflow.com/questions/2617827/why-i-cant-draw-in-a-loop-using-uiview-in-iphone I think the CGContext is very different from my previous programming experience....(I used HTML5 canvas, that allow me add more details, after I draw, so do the Java Swing) Actually, I want to know what is the suitable to implement these kind of thing in Apples' programmer mind. Thz.

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• Which programming languages have helped you to understand programming better?

  - by Xaisoft

  Which programming languages not only make you more proficient in the particular language your are learning, but also have a direct impact on the way you think and understand programming in general; therefore, making you a better programmer in other languages. Basically, which languages have the biggest impact on understanding the how and why of different programming concepts? What about Scheme? I have heard good things about that. I thought about taking the simplest of problems and implementing them in various languages. Has anyone done this?

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• How do the young start programming nowadays

  - by PP

  Back in the late 80s/early 90s I learned GWBasic on MS-DOS. Then Turbo Pascal. Then Turbo C/Asm. Later I stumbled into PHP and finally made a career out of Perl programming. I'm curious how actual under-25s found their way into programming. There is a lot of discussion about what path you would steer your children if you wanted them to learn programming, but I would like to hear from the newer generation to find out their more modern experiences about becoming a programmer. Note: no stories from people who first discovered programming at university.

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• Why not to use Array of errors instead of Exception Handling !?

  - by Naughty.Coder

  Why not using array of errors instead of throwing errors and check if it's not empty later in the code.... Exception handling is very confusing to me , I can not understand it's purpose ... can anybody enlighten me !? they compare it with die() as better not to stop the execution of the code , why would I stop the execution of code if I don't want to !? ofcourse I do I'm a beginner programmer , it might be confusing to you as well , or because i'm not very experienced in this ugly thing. Please in the context of PHP only.

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• Programmatically modifying an embedded resource before registering/referencing it on the page

  - by Jimock

  Hi All, Firstly, "Modifying" may be the wrong term, I see a few people have posted online just asking whether they can actually modify an embedded resource. What I am wanting to to, is use a resource in my assembly as a kind of template which I would do a find and replace on before registering it on the page - is this possible? For example; say I have a few lines of jQuery as an embedded resource in my assembly and in this script I am referencing a CSS class name that can be set by the front-end programmer. Since I do not know what the CSS class will be until implementation, is there a way of going through the embedded resource and replacing, say, $myclass$ with ThisClassName. Any help would be appreciated, if it's not possible then at least tell me so I can stop chasing my tail. Cheers, James

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• Practical guide to programming paradigms ?

  - by Pierre

  I think I might be misunderstanding the whole thing and I am looking for some programming wisdom. When faced with a programming challenge, I feel the most important question is "which programming paradigm(s) are better suited to handle it, and how to apply them". A distant second is "which language to use". Yet it seems that most of the programming related content I stumble upon on the Internet has it exactly backwards and focuses mostly on the language choice. An object-oriented solution is fundamentaly the same, whether it's implemented in c++, Java or PHP... So where is the paradigm centered content? Where is the "practical guide to programming paradigms and implementations" and other literature helping bringing real-world and programming concepts together? Note: I already know about "Programming Paradigms for Dummies: What Every Programmer Should Know" from Peter Van Roy.

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• Is it a bad idea if equals(null) throws NullPointerException instead?

  - by polygenelubricants

  The contract of equals with regards to null, is as follows: For any non-null reference value x, x.equals(null) should return false. This is rather peculiar, because if o1 != null and o2 == null, then we have: o1.equals(o2) // returns false o2.equals(o1) // throws NullPointerException The fact that o2.equals(o1) throws NullPointerException is a good thing, because it alerts us of programmer error. And yet, that error would not be catched if for various reasons we just switched it around to o1.equals(o2), which would just "silently fail" instead. So the questions are: Why is it a good idea that o1.equals(o2) should return false instead of throwing NullPointerException? Would it be a bad idea if wherever possible we rewrite the contract so that anyObject.equals(null) always throw NullPointerException instead?

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• Java operator overload

  - by rengolin

  Coming from C++ to Java, the obvious unanswered question is why not operator overload. On the web some go about: "it's clearly obfuscated and complicate maintenance" but no one really elaborates that further (I completely disagree, actually). Other people pointed out that some objects do have an overload (like String operator +) but that is not extended to other objects nor is extensible to the programmer's decision. I've heard that they're considering extending the favour to BigInt and similar, but why not open that for our decisions? How exactly if complicates maintenance and where on earth does this obfuscate code? Isn't : Complex a, b, c; a = b + c; much simpler than: Complex a, b, c; a.equals( b.add(c) ); ??? Or is it just habit?

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• Common Ruby Idioms

  - by DanSingerman

  One thing I love about ruby is that mostly it is a very readable language (which is great for self-documenting code) However, inspired by this question: http://stackoverflow.com/questions/609612/ruby-code-explained and the description of how ||= works in ruby, I was thinking about the ruby idioms I don't use, as frankly, I don't fully grok them. So my question is, similar to the example from the referenced question, what common, but not obvious, ruby idioms do I need to be aware of to be a truly proficient ruby programmer? By the way, from the referenced question a ||= b is equivalent to if a == nil || a == false a = b end (Thanks to Ian Terrell for the correction) Edit: It turns out this point is not totally uncontroversial. The correct expansion is in fact (a || (a = (b))) See these links for why: http://DABlog.RubyPAL.Com/2008/3/25/a-short-circuit-edge-case/ http://DABlog.RubyPAL.Com/2008/3/26/short-circuit-post-correction/ http://ProcNew.Com/ruby-short-circuit-edge-case-response.html Thanks to Jörg W Mittag for pointing this out.

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