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  • How does this iterative Tower of Hanoi work? C

    - by Nitesh Panchal
    Hello, while surfing google, i found this interesting solution to Tower Of Hanoi which doesn't even use stack. Can anybody explain me in brief, what is it actually doing? And this solution really acceptable? #include <stdio.h> #include <stdlib.h> int main() { int n, x; printf( "How many disks? " ); scanf( "%d", &n ); printf("\n"); for (x=1; x < (1 << n); x++) printf( "move from tower %i to tower %i.\n", (x&x-1)%3, ((x|x-1)+1)%3 ); return 0; }

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  • NASM shift operators

    - by Hudson Worden
    How would you go about doing a bit shift in NASM on a register? I read the manual and it only seems to mention these operators , <<. When I try to use them NASM complains about the shift operator working on scalar values. Can you explain what a scalar value is and give an example of how to use and <<. Also, I thought there were a shr or shl operators. If they do exist can you give an example of how to use them? Thank you for your time.

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  • Generics Type issue

    - by JohnJohnGa
    ArrayList<Integer> arrI = new ArrayList<Integer>(); ArrayList arrO = arrI; // Warning /* It is ok to add a String as it is an ArrayList of Objects but the JVM will know the real type, arrO is an arrayList of Integer... */ arrO.add("Hello"); /* How I can get a String in an ArrayList<Integer> ?? Even if the compiler told me that I will get an Integer! */ System.out.println(arrI.get(0)); Anybody can explain what's happening here?

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  • Dragged div change places with destination

    - by Cudos
    Hi. Maybe a bit complex to explain. I have a grid with 9 images 100 x 100 px like this (each number symbolize a picture): 1 2 3 4 5 6 7 8 9 What I want is that the user can drag and drop e.g. 9 over 1 and they change places like this: 9 2 3 4 5 6 7 8 1 Sortables from jquery UI will not work since their solution is using floats. That will "push" all the boxes to the right or left e.g.: 9 1 2 3 4 5 6 7 8 thanks in advance.

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  • Regex Question..

    - by Josh
    Hello everyone- In my C# Console App I'm trying to use Regex to search a string to determine if there is a match or not. Below is my code but it is not quite working right so I will explain further. sSearchString is set to "_One-Call_Pipeline_Locations" and pDS.Name is a filename it is searching against. Using the code below it is set to true for Nevada_One-Call_Pipeline_Locations and Nevada_One-Call_Pipeline_LocationsMAXIMUM. There should be a match for Nevada_One-Call_Pipeline_Locations But Not for Nevada_One-Call_Pipeline_LocationsMAXIMUM. How can I change my code to do this properly? Thanks in advance if (Regex.IsMatch(pDS.Name, sSearchString))

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  • Virus - How much it can affect?

    - by Sarang
    In our daily life, we come across various Viruses. In this internet world, we do have lots of type of viruses come to visit us ! While for the beginners, Virus is a complicated matter to fight with. Please explain the way how the virus come flow across the PC using Internet. What are the ways to search for them in the Personal Computer ? Also, we do have various solutions available in the market of Anti-Viruses, but also have different comments available for different software. Which is actually, really a useful Anti-Virus in the market that can give reliable performance ? Every Personal Computer connected to internet has to face against the viruses. Isn't there any general solution using Internet itself through which all networked computers get protected against Viruses ? Please give any solution.

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  • Changing Color with LinearLayout and TextView in Java (Android)

    - by Rob S.
    I'm a relatively new Android developer and I noticed what seems like an oddity to me that I'm hoping someone can explain. I have LinearLayout ll. This line of code fails for me when executed: ll.setBackgroundColor(R.color.white); However this line of code works: ll.setBackgroundResource(R.color.white); I assume its simply because I have white defined in my resources. However, I've also tried passing 0xFFFFFF in setBackgroundColor() and that doesn't work either. Similarly with my TextView text this line of code fails when executed: text.setTextColor(R.color.white); I can see my TextView so I know I initialized it correctly (like my LinearLayout which I can also see). So I guess my question boils down to: How do I properly use LinearLayout.setBackgroundColor() and TextView.setTextColor() ? Thanks a ton in advance. I've read through the docs and tried to find information online via googling and haven't come up with anything.

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  • Help with output generated by this C code using fork()

    - by Seephor
    I am trying to figure out the output for a block of C code using fork() and I am having some problems understanding why it comes out the way it does. I understand that when using fork() it starts another instance of the program in parallel and that the child instance will return 0. Could someone explain step by step the output to the block of code below? Thank you. main() { int status, i; for (i=0; i<2; ++i){ printf("At the top of pass %d\n", i); if (fork() == 0){ printf("this is a child, i=%d\n", i); } else { wait(&status); printf("This is a parent, i=%d\n", i); } } }

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  • nodejs response speed and nginx

    - by user1502440
    I'm just started testing nodejs, and wanted to get some help in understanding following behavior: Example #1: var http = require('http'); http.createServer(function(req, res){ res.writeHeader(200, {'Content-Type': 'text/plain'}); res.end('foo'); }).listen(1001, '0.0.0.0'); Example #2: var http = require('http'); http.createServer(function(req, res){ res.writeHeader(200, {'Content-Type': 'text/plain'}); res.write('foo'); res.end('bar'); }).listen(1001, '0.0.0.0'); When testing response time in Chrome: example #1 - 6-10ms example #2 - 200-220ms But, if test both examples through nginx proxy_pass server{ listen 1011; location / { proxy_pass http://127.0.0.1:1001; } } i get this: example #1 - 4-8ms example #2 - 4-8ms I am not an expert on either nodejs or nginx, and asking if someone can explain this? nodejs - v.0.8.1 nginx - v.1.2.2

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  • Using GetLineStartPosition to get the end of a line in WPF RichTextBox.

    - by Alan Spark
    A bit of background. I would like to be able to process text for the line that the caret is on in a WPF RichTextBox. Please see my earlier question about the TextPointer class: http://stackoverflow.com/questions/3046162/how-to-keep-track-of-textpointer-in-wpf-richtextbox. I know how to get the TextPointer at the start of the current line by using GetLineStartPosition with 0 as the argument but would now like to get the TextPointer at the end of the line. It was suggested in my previous question that this is possible using the GetLineStartPosition method. I would appreciate it if someone can explain a bit about how the GetLineStartPosition works with regard to end of line pointers. Thanks in advance for any help.

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  • Static footer, with attached and scaling overlap

    - by DavidYell
    I have been asked by a client to create a site where the content area overlaps the footer. However they also want the footer to be attached to the bottom of the viewport, which I've done, but it seems that I can't find a good way to vertically stretch the content to maintain the overlap should the browser be resized. I've created a diagram to help explain, http://www.squaresphere.co.uk/images/footer-diagram.png So ideally I need a way of calculating the height of the content and stretching the content div if content_length viewport.height, but keep a min-height if content_length < viewport.height A solution using html+css would be fantastic, but I'm starting to think that I'm going to have to do some funky jQuery onviewportresize or something Any suggestions would be awesome, thanks!

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  • Should every code for the Wordpress plgins be included in the functions and hooked with the Wordpres

    - by Chetan sharma
    I just started the Plugin development for the Wordpress, but finding it little difficult to understand. Looks like everything should be hooked with the wordpess to get it run and moreover are there all the global variables that i need to use. I am making a video plugin and designed some of the forms and display page, but didn't went through the templates, is it compulsory to follow the template structure or we can design our on layout. I am pretty much confused about all this. Can someone explain a little. Thanks.

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  • Axis xsd:dateTime issue

    - by milostrivun
    Here is the whole thing. I 'm using a webservice, with wsdl2java I generate classes and communicate with another application. Problem is , when I use a method from my generated WS client that is resulting in data that contains some object with data in format xsd:dateTime(Axis 1.4), and that data is represensted by java.util.Calendar object in java has time shifted to GMT(about two hours before my time zone). That results in bad data that I have to substract two hours to display correct value. My question is, considering I didn't work on building that webservice(all I have is wsdl url) where is the problem and can I fix it or the problem is at the side of the webservice creator. If I'm it is not clear what I am asking I will gladly explain as much as I can.

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  • Imagecache, Views, file renaming, and output directories

    - by Bruno
    I have been trying to figure this one out for awhile and just seem to be getting myself deeper into a rabbit hole.. I think it would be best if I would just explain what I am trying to accomplish and go from there.. Essentially what I would like to happen is a user would upload a photograph from the filefield sources on a content type, and then using views, it would output that different image through different imagecache actions.. The problem seems to be that the actual directories it is making is really cluttered and I would like it to be a little bit more organized due to some file renaming. Here is how I would like the process to happen: Upload image.jpg Imagecache resize 100x100 square and save file to same directory and name the file image-100.jpg Imagecache desaturate 100x100 square and save file to same directory and name the file image-d-100.jpg Currently it seems that every imagecache action will save that file in its own directory.. How can I specify a more customized output? Thanks, Anthony

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  • Care to be taken when serving static content (JS, CSS, Media) from different domain?

    - by Aahan Krish
    Let me try to explain by example. Say website is hosted at example.com (NOT www.example.com). In order to serve static content cookie-free, I've chosen to use a different domain example-static.com. Now, lets consider that my static content is currently served like this: http://example.com/js/script.js http://example.com/css/style.css http://example.com/media/image.jpg ** Now I create a CNAME record aliasing example-static.com to my main domain i.e. example.com so that the static content is served as such: http://example-static.com/js/script.js http://example-static.com/css/style.css http://example-static.com/media/image.jpg ** Is that all I have to do? Will all browsers execute JavaScript files and load web fonts without any security concerns? OR should I be using some .htaccess rules to modify header information and the like? PS: It would be great if you can provide what rules should be added, if need be.

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  • two HashMap iteration

    - by user431276
    I have two HashMaps and I can iterate both hashmaps with following code Iterator it = mp.entrySet().iterator(); while (it.hasNext()) { Map.Entry pairs = (Map.Entry)it.next(); String firstVal = pairs.getValue(); } Iterator it2 = mp2.entrySet().iterator(); while (it2.hasNext()) { Map.Entry pairs2 = (Map.Entry)it.next(); String SecondVal = pairs2.getValue(); } myFunction(firstVal, SecondVal) Is there anyway to iterate two hashmaps at the same time without using two loops? Currently, I have a method that accepts two parameters and each parameter value is stored in first and second hashmap. I have to iterate first hash then second to get values. I think there must be a good way to do it but I don't know :( P.S: there could be some errors in above code as this is just an example to explain my problem. Each iterator is a method in original program and accept one parameter. I couldn't copy past real time functions as they are HUGE !

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  • Anchors within the document and their position.

    - by Jose Vega
    On the following website, www.josecvega.com, I have a navigation bar with years that link to sections on that same page. Unfortunately it is not working they way I hoped, when the user selects a year it moves to the section of the page, but puts that section on the top of the page. I have a fixed div on the top of the page that covers the sections and prevents it from properly displaying. What can I do for this to work? It hard to explain my situation, but it can be seen by going to www.josecvega.com and clicking one of the years.

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  • jQuery text attribute selector

    - by Shagglez
    I am trying to use the text attribute as a selector, but I can't quite grasp the behaviour, would really appreciate if someone could explain. For example given <span class="span_class"><a class="a_class">text</a></span>, $('a.a_class').text() gives "text" as expected. However $('a.a_class[text]') wouldn't match any elements, and neither would $('span.span_class > a.a_class[text]'), but $('span.span_class* > a.a_class[text]') would (although not in IE). The only workaround I can think of for IE, is loop through all anchors contained in a span, use .text() on each and match it against a certain criteria, but it seems slower than using in-built selectors. Anyone have better ideas?

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  • Nesting queries in SQL

    - by ZAX
    The goal of my query is to return the country name and its head of state if it's headofstate has a name starting with A, and the capital of the country has greater than 100,000 people utilizing a nested query. Here is my query: SELECT country.name as country, (SELECT country.headofstate from country where country.headofstate like 'A%') from country, city where city.population > 100000; I've tried reversing it, placing it in the where clause etc. I don't get nested queries. I'm just getting errors back, like subquery returns more than one row and such. If someone could help me out with how to order it, and explain why it needs to be a certain way, that'd be great.

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  • Initialising structs in C++

    - by Neil Butterworth
    As an addendum to this question, what is going on here: #include <string> using namespace std; struct A { string s; }; int main() { A a = {0}; } Obviously, you can't set a std::string to zero. Can someone provide an explanation (backed with references to the C++ Standard, please) about what is actually supposed to happen here? And then explain for example): int main() { A a = {42}; } Are either of these well-defined? Once again an embarrassing question for me - I always give my structs constructors, so the issue has never arisen before.

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  • Jquery-Different between event.target and this keyword?

    - by Jerry
    Hi all Got a quick and might be an newbie question. What is the different between event.target and this? let's say I have $("test").click(function(e){ $thisEventOb=e.target; $this=this; alert($thisEventObj); alert($this); }); I know the alert will pop different value. Anyone could explain the difference? Thanks a million.

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  • Seeking free ODBC database optimization tool for non-experts

    - by mawg
    I'm a database n00b and am reading as many books as I can. I have been given responsibility for an ODBC tool where the databases were designed by a hardware engineer with some VB experience - which made him a s/w guru in the small firm at that time. Things are running slowly and I suspect that the db could have been designed better. I hope to learn enough to use Explain/Describe, etc maybe add some indices, but, in the meantime, is there any free for commercial use tool which can examine an ODBC database and suggest improvements. I'm just talking about db schema here, but maybe I should also be looking at optimizing Selects with Joins? Is there a tool for that? ODBC compliant.

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  • C# Bug or Brain Teaser? Cast working only with Coalesce (??) Operator

    - by Alex
    This is very strange, maybe someone can explain what's happening, or this is a bug (though I tend to think that this is probably just something intricate about C#). The following code throws the error "Cannot implicitly convert type 'uint?' to 'uint'.": public void Test(UInt32? p) { UInt32 x = p; } However, this code works without error: public void Test(UInt32? p) { UInt32 x = p ?? 1; } Huh? Why does this work? Why would the coalesce operator cause implicit conversion of UInt32? (nullable) to UInt32 (non-nullable), while the first error message says that there is no implicit conversion between those types?

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  • iPhone - a question about @property

    - by Roger
    Hi, I am kind of newbie on Objective-C and I was looking at a code, trying to understand a few things, and I come across with this .h file: there was a declaration like that on the @interface section MyVideoClass *contrast_; then below we have @property (nonatomic, retain) MyVideoClass *contrast; @property (nonatomic, retain) FetchClass *fetchMe; The strange part is that the first has an underscrore after the name and the second one, doesn't. The other strange thing is that the guy has a call to these properties like this: FetchClass *fetchOne = [self.fetchMe contrast]; What kind of call is that? This seems pretty insane to me. I simply cannot understand what is going on here, but the code works. pretty insane. Can you guys explain me that? Forgive the stupid question, but I am still learning... thanks

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  • What is this Design Pattern?

    - by Can't Tell
    I read the Wikipedia articles on FactoryMethod and AbstractFactory but the following code doesn't seem to fit anywhere. Can someone explain to me what the following pattern is or if it is an anti-pattern? interace PaymentGateway{ void makePayment(); } class PaypalPaymentGateway implements PaymentGateway { public void makePayment() { //some implementation } } class AuthorizeNetPaymentGateway implements PaymentGateway { public void makePayment() { //some implementation } } class PaymentGatewayFacotry{ PaymentGateway createPaymentGateway(int gatewayId) { if(gatewayId == 1) return PaypalPaymentGateway(); else if(gatewayId == 2) return AuthorizeNetPaymentGateway(); } } Let's say the user selects the payment method using a radio button on an html page and the gatewayId is derived from the radio button value. I have seen code like this and thought it was the AbstractFactory pattern but after reading the Wikipedia article, I'm having doubts.

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