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• Help me understand this Strange C++ code

  - by java lava

  Hi! This was a question in our old C++ exam. This code is driving me crazy, could anyone explain what it does and - especially - why? int arr[3]={10,20,30}; int *arrp = new int; (*(arr+1)+=3)+=5; (arrp=&arr[0])++; std::cout<<*arrp;

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• What is the 'accumulator in HQ9+?

  - by Koning Baard XIV

  I was just reading a bit about the HQ9+ programming language ( http://esolangs.org/wiki/HQ9 , http://en.wikipedia.org/wiki/HQ9%2B and http://www.cliff.biffle.org/esoterica/hq9plus.html ), and it tells me something about a so called 'accumulator' which can be incremented, but not be accessed. Also, using the + doesn't manipulate the result: code H+H result Hello World Hello World Can anyone explain me how this works, what this does and if it even makes any sense? Thanks

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• Sockets: I/O Error 32

  - by Genesis

  Could someone please explain what an I/O Error 32 refers to in the context of a network socket? I have a multithreaded Socks5 server written using Poco SocketReactors and am getting this error when the server load reaches a certain point. The exception is thrown within my onReadable handlers at the same time across all threads which have connections associated with them. The only other thing I am doing within those threads is std::cout but I am not sure if this is a potential cause.

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• Resources to get started with Commerce 2009 with SharePoint 2007

  - by Emad

  Hi, I need to get up to speed about developing a commerce site using MS-Commerce server 2009 and SharePoint 2007. I was wondering where are good resources to get started, to explain the concepts and design, etc.

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• problems with 'free' in C

  - by lego69

  hello, can somebody please explain can I free const char* ? I allocated new memory using malloc and when I'm trying to free it I always receive an error incompatible pointer type thanks in advance something like this char* name="Arnold"; const char* str=malloc(stlen(name)+1); free(str); <- here bug

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• Shift Operators in C++

  - by Codeguru

  If the value after the shift operator is greater than the number of bits in the left-hand operand, the result is undefined. If the left-hand operand is unsigned, the right shift is a logical shift so the upper bits will be filled with zeros. If the left-hand operand is signed, the right shift may or may not be a logical shift (that is, the behavior is undefined). Can somebody explain me what the above lines mean??

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• XML Database in C#.net

  - by rookieinfotech

  I am developing a WPF client program for some websites. It uses XML database. I am new to XML. Would someone please explain how to create,append(Most important),edit,read&encrypt XML file. It is a big question,i know . But, it is urgent.Have to complete the work ASAP. Searched in the internet, not getting correct info.

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• When should carry flag be set in assembly language.

  - by Summer_More_More_Tea

  Hi everyone: I'm puzzled by this problem when writting an ARM assembly simulator in C. I've found some similar questions in the forum, but none of them explain how to set the carry flag just using the relationship between two operands and the result. Any reply is appreciated. Thanks in advance. Regard.

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• error in c, but not in c++

  - by eswar

  const int t=5; char buf[t+5]; When I compile this gives error in C but not in C++!! Can anybody please explain me the reason? Note: I know the const defaults to internal linkage in 'C++', where as in 'C' it defaults to external linkage. Does it has any relation to the above case??

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• Can i play video in portrait mode?

  - by kmr

  Can anybody explain me how to play video in portrait mode in iphone device. It will be very helpful to if you provide some sample code for referance. Thanks in advance.

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• Ruby hash value truthiness and symbols

  - by John Topley

  Could somebody please explain why the variable named foo remains true in the code below, even though it's set to false when the method is called? And why the symbol version behaves as expected? def test(options = {}) foo = options[:foo] || true bar = options[:bar] || :true puts "foo is #{foo}, bar is #{bar}" end >> test(:foo => false, :bar => :false) foo is true, bar is false I've only tried this using Ruby 1.8.7.

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• What are the differences between break and exit?

  - by srikanth rongali

  Even I used break() and exit() statements many times, I am bit confused between them. I need to know exact meaning of both, when we should use them. Please explain with small example. Thank you.

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• Why should I pass Boolean as a parameter instead of "boolean"?

  - by ferrari fan

  Hi, A co-worker asked me to change a signature from using a primitive "boolean" to using a classed "Boolean". He didn't offer a very good explanation why? Have any of you heard of this and can any of you explain why it matters or doesn't matter? Edit: He mentioned that it was good practice for public methods.

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• Question ++ in c [closed]

  - by Niraj CHoubey

  Possible Duplicate: Could anyone explain these undefined behaviors (i = i++ + ++i , i = i++, etc…) int b=5; int c; c=b++ + ++b; outputs 12 while b=b++ + ++b; outputs 13. Can someone help me please?

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• C# Why does code compile fine when there is an ambiguous virtual method?

  - by Jimbo

  I have a class (Class B) that inherits another class (Class A) that contains virtual methods. Mistakenly, I omitted the override keyword when declaring a (supposed to be) overriding method in Class B. Class A public class ClassA{ public virtual void TestMethod(){ } } Class B public class ClassB : ClassA{ public void TestMethod(){ } } The code compiled without a problem. Can anyone explain why?

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• Excel macro, to copy and paste a cell value based on another cell value?

  - by Keziah Dorman

  Hi I shall try to explain clearly what I need to be able to do, here goes: I have an Excel spread sheet 1 with postcodes in column a and a number in column b. I need to create a macro/formula so that it will see the number (i.e 4) and copy and paste the postcode that number of times into sheet 2 column a underneath each other. I need to do this for the next row down etc until it comes to a blank. Sheet 1 A,B DE43PP,3 DE43PQ,8 Sheet 2 A,B DE43PP, DE43PP, DE43PP, Thanks

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• Mac OS X: getting file system changes of the last minute?

  - by Patrick

  From older times (Mac OS 10.4) I had found this command line on the web somewhere: mdfind '(kMDItemFSContentChangeDate >= $time.now(-60)) && (kMDItemFSContentChangeDate <= $time.now)' it gave me a list of files that where changed in the last minute. This does not work anymore on Mac OS 10.6. Can anybody explain why this doesn't work? And even suggest a working command line?

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• time required to finish the multithreaded program??

  - by user275131

  A java process starts 5 threads , each thread takes 5 minutes. what will be the minimum and maximum time taken by process? will be of great help if one can explain in java threads and OS threads. Edit : I want to know how java schedule threads at OS level.

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• What is digital signage theme?

  - by kishore

  hi all, Client is saying that For design he need digital signage theme. I dont know what is it. Can anyone explain it?

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• Why callbacks for the after_find and after_initialize events is to define them as methods?

  - by piemesons

  The only way to define callbacks for the after_find and after_initialize events is to define them as methods. If you try declaring them as handlers using the second technique, they’ll be silently ignored. Can anybody explain why is it so? Why specifically for these two callbacks?

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• ASP.NET C# Sending Information Back to Client While Processing Web Page

  - by user204588

  Hi, Not sure if I'll explain this properly but here goes. I having written an asp.net app using C# for the code behind. After the user makes some selection and hits the "run" button I pass off the processing to a dll written in C# but what I want is a way to periodically send information back to the client so they can see what's going on like how many records have been processed and things like that. How can I accomplish this? thanks

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• what is index in sql server?

  - by Surya sasidhar

  Hi, what is index in sql can u explain or any reference to understand clearly. where should i use the index. I search in stackoverflow but it is not clear for me. thank you

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• JSF Data transfer between UI to Business Layers

  - by Ram

  Hi, We are using JSF in UI,Spring in Business Layer,Hibernate in Persistance layer.Now my question is how to pass data from my JSF1.1_01 UI to spring Business Layer.Can I directly used my Business object in my Backed Bean or through DTO should I transfer data between the layer? Can one explain me with clear explanation if possible with piece of code and that related websites?

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• hidden folders in Internet

  - by lego69

  very often in Internet I see links like this: www.abcde.com/~main/material/hello and this part ~main/material/hello is grey, if I remove hello I receive access forbidden, can somebody explain, what is this system, and is it possible receive access?

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• compiling a c++ program including mysql

  - by wyatt

  I'm new to gcc, and trying to compile a c++ program which includes mysql.h using the command: g++ -o test test.cpp -L/usr/include/mysql -lmysqlclient -I/usr/include/mysql It works without issue, but I was wondering if someone could explain the arguments to me. I don't like using commands I don't understand. Thanks

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