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  • Is it a good idea for me to learn Python before C or some other Compiler language?

    - by Dream Lane
    Right now I am going through MIT's introduction to Computer Science course via OpenCourseWare. As a part of this course I am learning the Python Language. I've read a lot of things about the benefits of learning C. Before I dig any deeper into Python I wonder if I will be hindered or helped by learning Python first. Do you think that I will develop any bad habits or anything like that from Python?

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  • Should you always write code for else cases that "can never happen"?

    - by johnswamps
    Take some code like if (person.IsMale()) { doGuyStuff(); } else { doGirlOtherStuff(); } (Yes, I realize this is bad OO code, it's an example) Should this be written so that to explicitly check if person.isFemale(), and then add a new else that throws an exception? Or maybe you're checking values in an enum, or something like that. You think that no one will add new elements to the enum, but who knows? "Can never happen" sounds like famous last words.

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  • Merging list problem

    - by Martin Malmstrøm
    Sorry about the bad heading, but the question was not easy to compress into one sentence... I have two lists of contigs (list1 and list2). They contain mostly unique contigs, but with some overlap. I want to compare list1 and list2 and then create a list3 that contains all contigs in list1 minus those also present in list2. Is this possible with a simple cat/paste/grep/sort/uniq kind of batch command? Thanks!

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  • Compare array in loop

    - by user3626084
    I have 2 arrays with different sizes, in some cases one array can have more elements than the other array. However, I always need to compare the arrays using the same id. I need to get the other value with the same id in the other array I have tried this, but the problem happens when I compare the two arrays in a loop when the other array has more elements than one, because duplicate the loop and data , and it does not work. Here is what I've tried: <?php /// Actual Data Arrays /// $data_1=array("a1-fruits","b1-apple","c1-banana","d1-chocolate","e1-pear"); $data_2=array("b1-cars","e1-eggs"); /// for ($i=0;$i<count($data_1);$i++) { /// Explode ID $data_1 /// $exp_id=explode("-",$data_1[$i]); /// for ($h=0;$h<count($data_2);$h++) { /// Explode ID $data_2 /// $exp_id2=explode("-",$data_2[$h]); /// if ($exp_id[0]=="".$exp_id2[0]."") { print "".$data_2[$h].""; print "<br>"; } else { print "".$data_1[$i].""; print "<br>"; } /// } /// } ?> I want the following values : "a1-fruits" "b1-cars" "c1-banana" "d1-chocolate" "e1-eggs" Yet, I get this (which isn't what I want): a1-fruits a1-fruits b1-cars b1-apple c1-banana c1-banana d1-chocolate d1-chocolate e1-pear e1-eggs I tried everything I know and try to understand how I can do this because I don't understand how to compare these two arrays. The other problem is when one size has more elements than the other, the comparison always gives an error. I FIND THE SOLUTION TO THIS AND WORKING IN ALL : <?php /// Actual Data Arrays /// $data_1=array("a1-fruits","b1-apple","c1-banana","d1-chocolate","e1-pear"); $data_2=array("b1-cars","e1-eggs","d1-chocolate2"); /// for ($i=0;$i<count($data_1);$i++) { $show="bad"; /// Explode ID $data_1 /// $exp_id=explode("-",$data_1[$i]); /// for ($h=0;$h<count($data_2);$h++) { /// Explode ID $data_2 /// $exp_id2=explode("-",$data_2[$h]); /// if ($exp_id2[0]=="".$exp_id[0]."") { $show="ok"; print "".$data_2[$h]."<br>"; } /// } if ($show=="bad") { print "".$data_1[$i].""; print "<br>"; } /// } ?>

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  • In which language the KIS application might have been developed??

    - by Jeba
    Hello all, I just went through this link http://www.pcauthority.com.au/Feature/91093,the-tsar-of-antivirus.aspx and found that it's developed using c/c++ and visual studio with a little assembly language support. As a programmer i just want to know in what programming language the kaspersky internet security User Interface(UI) has been developed? Might be using QT(coz. of c++)? or using MFC(coz. of visual studio)?? With side tab like thing the UI looks good. Expecting the answers from expert analysts.

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  • Pushing changes to a remote server from a locally started repo

    - by Eliseo Soto
    I started a new project and created a local git repo with "git init" and now I have a few branches and everything works great. However, since my webhosting company offers git hosting (details if you're curious), I'd like to push my entire repo to their servers to have a backup in the cloud in case something bad happens to my local repo. How can I make the remote repo the "origin" since the repo was started locally?

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  • What programming languages do you consider indispensable in your experience?

    - by Federico Ramponi
    Each programming language comes with its concepts, best practices, libraries, tools, community, in one word: culture. Learning more than one programming language will make you a better programmer, for the more concepts you learn, the faster you will feel comfortable when the next language or technology will come. Mine, so far, are C, some C++, and Python, and many times I read that it would be worth learning LISP, for "the profound enlightenment experience you will have when you finally get it" (quoting Eric Raymond). My questions are: Which is the next one you would consider a good investment to learn? Of the many programming languages you have learnt and worked with, which ones do you consider to be an essential part of one's CS culture, and why? EDIT. Further question: is there any language you would sincerely advise to avoid as a waste of time? (The famous, and questionable, slatings in this letter from Dijkstra come to my mind.)

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  • Which programming paradigm or language open most your mind?

    - by Dom De Felice
    It is often said that some programming languages exist that once grasped can open your mind and change the way you write software. A sort of "software design enlightenment", we can say. I heard this about Lisp, Smalltalk, Haskell, pure functional programming in general.. What are your experiences about this? I know that the right language to use depends on your needs, but I would like to know the one that better improve your programming skills in general. What do you think would be the best language/paradigm to learn to end up being a better programmer in the long run?

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  • Does any method exist quickly to detect valid range versions of used library

    - by daneel-yaitskov
    I'm a beginner Haskell programmer. I have written some useful code for the last six month. And I want to release a library from it. The code will use system installation cabal as any Haskell library. A library is released with cabal has a meta data file where there is a logical predicate from the libraries and their versions. A developer usually uses one set libraries. It tediously care a set of the sets libraries. How to know either my library is compiled successfully or not for some subset libraries?

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  • Using intermediate array for hashCode and equals

    - by Basilevs
    As its a pain to handle structural changes of the class in two places I often do: class A { private B bChild; private C cChild; private Object[] structure() { return new Object[]{bChild, cChild}; } int hashCode() { Arrays.hashCode(structure); } boolean equals(Object that) { return Arrays.equals(this.structure(), ((A)that).structure()); } } What's bad about this approach besides boxing of primitives? Can it be improved?

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  • C++ Typing and OOP child classes

    - by Zack
    I'm a bit confused: If I have a base class A, and a class B which extends A, can a variable of the type A hold a value of the type B and vice versa? If yes, why? Aren't they completely different even if B is derived from A? How about type-safety? If this is possible, what things do I have to mind when taking use of this? How would this work out in terms of performance? Note: Sorry if I asked too many questions, just ignore them and just look out for those "marked" with the list decoration dot :) Also, this is not my homework. I'm a hobby programmer and have skills in scripting languages with OOP, yet I'm relatively new to OOP typing in C++.

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  • How to redirect by checking for a particular previous url

    - by Bearish_Boring_dude
    I have the following piece of code in my controller def index session[:previous_url] = URI(request.referer).path if session[:previous_uri] != new_path redirect_to registration_path(id: current_user.associate_username) end end However this does not actually work and i get a bad URI error. I just want to check if the request came from a particular page and if not redirect it to another page. I would also like to know if there is a better way for doing this?.Thank you

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  • Why does my table values return nil when i clearly initialized them?

    - by user3717078
    players = {} function newPlayer(name) players[name]={x = 200, y = 100} --assign each player their x and y coordinates, which is x: 200 and y: 100 end function checkPosition(name?) -- Do i need a parameter? if players[name].x == 200 and players[name].y == 100 then --says players[name].x is a nil value print("good") else print("bad") end end Error: attempt to index ? (a nil value) Current Situation: The code above says players[name].x is a nil value, I would like to know why since i thought i assigned it in the function newPlayer.

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  • Passing DataSource object from a servlet to a JavaBean

    - by Slavko
    I like the ease of using @Resource annotation to get a DataSource, but as far as I know, it's not possible to use it in a regular JavaBean. Would it be considered a bad practice if I pass the DataSource object from a servlet to a bean along with the other data to avoid having that lookup code in the bean?

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  • Is an Iframe my only option?

    - by cyggi
    I have a job to develop a website. My client wants it so that there is a header, a menu and for the content a rectangle-like box in which you can scroll the text. So that header and menu don't move but the text in the box does. It should look like this: ***********header image *********** menu menu menu menu -------------- | you || | can || | scroll in || | this box || |_____________ Is my only option to implement this an iframe? Would it be bad practice to use an iframe for this?

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  • SQLAlchemy: an efficient/better select by primary keys?

    - by hadrien
    Yet another newbie question.. Let's say I have an user table in declarative mode: class User(Base): __tablename__ = 'user' id = Column(u'id', Integer(), primary_key=True) name = Column(u'name', String(50)) When I have a list of users identifiers, I fetch them from db with: user_ids = [1, 2, 3, 4, 5] users = Session.query(User).filter(User.id.in_(user_ids)).all() I dislike using in_ because I think I learned it has bad performance on indexed fields (is that true/false?). Anyway, is there a better way doing that query? Thanks!

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  • webprogramming -what is the learning pathway ?

    - by Bunny Rabbit
    i have some knowledge of css,jQuery,Grails,django,servlets and jsp still i can't see me designing good professional looking websites .what am lacking ? should i start learning jQUery ui ,should i get into adobe products like flash i am pretty confused. i am pretty bad in the userinterface part,

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  • Freeglut ( OpenGL ) in C

    - by user1832149
    I would like to ask for you a little help in my homework. I'm learning at an university of Debrecen, and I would like to be a programmer, but I'm stuck with this homework. It's a OpenGL project in C. (freeglut) The next task is about: Window to viewport transformation. Draw graphs of functions, as shown below. The individual views (viewport) defines four different rectangles. Functions look like this picture: one window in 4 piece, and one pice of one function. The functions, respectively: f(x)=x2 g(x)=x3 h(x)=sin(x) i(x)=cos(x) Heres a pic what I need to make: How would I approach such a task?

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  • Isn't objective-c function parameter syntax weird? [closed]

    - by Haoest
    Consider the following method: +(void) myMethod:(int)arg1 **argument2**(int)arg2 **argument3**(int) arg3; See how the first argument, unlike the 2nd and 3rd, doesn't have a description, giving it an impression of bad symmetry. Also you would expect the extra typing will provide named argument as you pass it in, but you still have to pass them in the correct order. Can anyone help me make sense of this?

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  • What would be the simplest way to deal with a text file using JSP?

    - by Nano Taboada
    First and foremost I should acknowledge that I have no experience at all using Java ServerPages, but I'm positive about achieving this task if you guys help me out a bit since it doesn't seem like something difficult for a seasoned JSP programmer. Anyway the thing is, there's an actual running JSP application within a *NIX box which I somewhat administer with kind of good permissions. The idea is to create a new but dead simple JSP page to control some Korn Shell scripts I've got running there. So the goal is to make some sort of HTML form that will be writing some kind of scriptStatus.on / scriptStatus.off file: #!usr/bin/ksh # coolScript.sh # This is my cool script that is being launched by cron every 10 minutes. if [ -e scriptStatus.off ] then # monitor disabled else # monitor enabled fi which then can be checked for existence within the running script, therefore allowing to easily activate / deactivate it without actually have do deal with cron. Please let me know if all this does make any sense and don't hesitate to ask as much questions as needed. Thanks much in advance!

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  • How can I dual boot my iphone or ipad to run a very simple custom os?

    - by Jim98
    I am an experienced C/C++ programmer and have worked with assembly and many other programing language and I want to start a project as a learning process. I want to try and run a simple custom os on the iphone or ipad. What knowledge would I need to do this, and how does the iphone or ipad bootloader load the os and how could I modify it to load a custom os? Im not really sure what to ask here so I really just need to get as much information as possible so I could ask some more informed questions to get my project started Thanks

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  • What things didn't you know you needed but are now very glad you have?

    - by DrStalker
    Take a programmer that has never used source control, show them what it does, and their eyes light up... the benefits are obvious but until they actually see it most people had never considered the existence of such a tool. What other such things exist? Tools or approaches or techniques that aren't obvious before you encounter them, but once seen have obvious value. Things that are likely so ingrained in the way you work that it's hard to think of working without them, things almost embarrassing to bring up because you expect the other person to say "duh, that's obvious!" No matter how petty something seems there is a chance that other people don't know about it yet; I'd like to get an idea on what things I'm missing simply because I never thought of them.

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  • Three boolean values saved in one tinyint

    - by Casper
    Hello, probably a simple question but I seem to be suffering from programmer's block. :) I have three boolean values: A, B, and C. I would like to save the state combination as an unsigned tinyint (max 255) into a database and be able to derive the states from the saved integer. Even though there are only a limited number of combinations, I would like to avoid hard-coding each state combination to a specific value (something like if A=true and B=true has the value 1). I tried to assign values to the variables so (A=1, B=2, C=3) and then adding, but I can't differentiate between A and B being true from i.e. only C being true. I am stumped but pretty sure that it is possible. Thanks

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  • Threads in C# [Question]

    - by blez
    Thread1/2: do TotalThreads-- on their exit int TotalThreads = 2; void AsyncFunc() { // run thread for Func() } void Func() { // run Thread1 // run Thread2 while(TotalThreads > 0) { /* do nothing */ } // some code } is that bad design?

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