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• Better alternative for PipedReader/PipedWriter?

  - by Esko Luontola

  I need to have a buffered char stream, into which I write in one thread and from which I read in another thread. Right now I'm using PipedReader and PipedWriter for it, but those classes cause a performance problem: PipedReader does a wait(1000) when its internal buffer is empty, which causes my application to lag visibly. Would there be some library which does the same thing as PipedReader/PipedWriter, but with better performance? Or will I have to implement my own wheels?

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• How to make switch case accept multiple data types in Java?

  - by Starx

  While using Java's switch case, it excepts only char and int, but I want to provide string cases. How to make this possible?

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• C++ static array leading to memory leak?

  - by MDonovin

  Lets say I have something like... void foo() { char c[100]; printf("this function does nothing useful"); } When foo is called, it creates the array on the stack, and when it goes out of scope, is the memory deallocated automatically? Or is c destroyed, but the memory remains allocated, with no way to access it/get it back except restarting the computer?

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• Display unicode character in Actionscript

  - by Jan

  I have the unicode for that char, how do I display it? 0x023D2A textField.text = ???; i have have the name of the character. can I reference it by name?

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• Why does MPI_Init accept pointers to argc and argv?

  - by iamrohitbanga

  this is how we use MPI_Init function int main(int argc, char **argv) { MPI_Init(&argc, &argv); … } why does MPI_Init use pointers to argc and argv instead of values of argv?

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• Serializing Vector<String> to String

  - by dhroller

  I need to convert a Vector to a String (an vice versa) to be stored in a CHAR field in a database. What is the most efficient way to do this ?

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• Can RAM handle different data type sizes?

  - by tstbu

  int, char and bool usually have different sizes. Where intcharbool, I suppose. But does the RAM even support this? How is it built up? Can it take advantage of bool being only 1 byte and store it in a small "register"?

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• How to assign class instances in exception handler during constructor execution

  - by xwoundwortx

  public Alphabet(params char[] list) { this.ExceptionInitializer(); try { if (list != null) _alphabet = list; else throw this.NullableAssignment; //add exception handler; this._charCounter = list.Length; } catch (this.NullableAssignment) { // var x = new Alphabet(); // this = x; //FAIL! } }

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• Unicode escaping in C/C++

  - by Geo

  Hi guys! I'm having a dispute with a colleague of mine. She says that the following: char* a = "\x000aaxz"; will/can be seen by the compiler as "\x000aa". I do not agree with her, as I think you can have a maximum number of 4 hex characters after the \x. Can you have more than 4 hex chars? Who is right here?

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• Determine if a number is a prime with regex?

  - by kitlite

  I found the following code example for Java on RosettaCode: public static boolean prime(int n) { return !new String(new char[n]).matches(".?|(..+?)\\1+"); } I don't know Java in particular but understand all aspects of this snippet except for the regex itself I have basic to basic-advanced knowledge of Regex as you find it in the built-in PHP functions How does .?|(..+?)\\1+ match prime numbers?

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• Struts html:checkbox query

  - by sarah

  Hi All, i have the following code . <td> <html:checkbox name="userForm" property="isActive" /></td> and in Form is have property called isActive of type char ,how would i get the checked value of it ,i am getting some symbols like 'o' if checked. I am using userform.getIsActive() ,where i am going wrong .I want 'y' or 'n' values

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• Firebird 2.1 + EXISTS = query bug?

  - by Atlas

  Using Delphi 2009 + Firebird 2.1.3. Database is ODS 11.1, default char set is UTF8. My prepared query is as follows: SELECT a.po_id, a.po_no FROM purchase_order a WHERE EXISTS (SELECT 1 FROM sales_order_item z1 JOIN purchase_order_item z2 ON z2.so_item_id = z1.so_item_id AND z2.po_id = a.po_id WHERE z1.so_id = :soid) ORDER BY a.po_no Now when I loop this say 1000 times because I have 1000 x so_id, the CPU usage get at 100% for FBSERVER.EXE Anyone encountered this problem?

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• ruby sortby 3rd element in a multidimential array npot working properly

  - by Steven

  Hi, I'm using ruby to sort an array where each element in the array is another array. I have this: Data = Data.SortBy { |Info| info[3] } example data in this column: 3.1 2 5.65 -1 0.4 -9.43 -10.87 -2.3 It should sort this into: 5.65 3.1 2 0.4 -1 -2.3 -9.43 -10.87 But it comes out like this: 5.65 3.1 2 0.4 -1 -10.87 -2.3 -9.43 It's only comparing the first char of the float... not the whole number?

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• Haskell Input & Passing Values to Functions

  - by Pradeep

  putStrLn "Enter the Artist Name" art <- getLine putStrLn "Enter the Number of CD's" num <- getLine let test= buyItem currentStockBase art num printListIO (showcurrentList test) the values i have to pass for buyItem is buyItem currentStockBase "Akon" 20 but i want to send "Akon" to art and for 20 i want to send num it gives me this error ERROR file:.\Project2.hs:126 - Type error in application *** Expression : buyItem currentStockBase art num *** Term : num *** Type : [Char] *** Does not match : Int please help me

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• Retrieving the first digit of a number

  - by Michoel

  Hi, I am just learning Java and am trying to get my program to retrieve the first digit of a number - for example 543 should return 5, etc. I thought to convert to a string, but I am not sure how I can convert it back? Thanks for any help. int number = 534; String numberString = Integer.toString(number); char firstLetterChar = numberString.charAt(0); int firstDigit = ????

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• getchar() and putchar()

  - by gautam kumar

  is getchar() equivalent to scanf("%c",&a); is putchar(c) equivalent to printf("%c",a); where a is a char variable

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• How can I get the sizes of various types in c?

  - by user292489

  I'm looking for the following information to be printed out: sizeof(int) = ? sizeof(float) = ? sizeof(double) = ? sizeof(char) = ? sizeof (167) = ? sizeof(3.1415926) = ? sizeof(‘$’) = ?

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• C++ Any way to store different templated object into the same container

  - by JP

  Is there any hack I could use to do this: template <class TYPE> class Hello { TYPE _var; }; I would like a way to store Hello<int> intHello and Hello<char*> charHello into the same Container such as a Queue / List.

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• Best way to store a string in an iPhone app?

  - by pkulak

  I've started a new iPhone app that needs to remember a single, 40-char string. That's it. I've hooked into Core Data, and am reading about it now, but it really seems like overkill. Is there an easier way to do something so simple?

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• How to list all the objects with a specific date no matter the time in a DateTime Field

  - by Marcoslhc

  I Have a model like this foo=models.char bar=models.dateime In wich several foos arrives in one day in different time. I need to list all the foos in a specific date, no matter the time they arrive. I can't change the model, so splitting the bar in two fields(one for date and one for time) is out of reach right now :(

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• How to parse a string to an int in C++?

  - by eed3si9n

  What's the C++ way of parsing a string (given as char *) into an int? Robust and clear error handling is a plus (instead of returning zero).

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• Comparing the values of two nsstrings

  - by user1776234

  So I have been trying to compare two NSStrings in xcode. However, it is not working. What am I doing wrong? NSString Prog are characters that are xml parsed from mysql char *cStr = "YES"; NSString *str3 = [NSString stringWithUTF8String:cStr]; if ([str3 isEqualToString:prog]) { [switch1 setOn:YES animated:YES]; } else { [switch1 setOn:NO animated:YES]; }

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• Is there a equivalent in C for C++ templates?

  - by nunos

  In the code I am writing I need a foo(int, char*) and a foo(int, int) functions. If I was coding this in C++ I would use templates. Is there any equivalent for C? Or should I use void pointers? How? Thanks.

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• TSQL - MSSQL 2008 add a column and update it in same stored procedure

  - by TortTupper

  if I have a stored procedure say create procure w AS ALTER TABLE t ADD x char(1) UPDATE t set x =1 Even when it lets me create that stored procedure (if I create it when x exists), when it runs, there is an error on the UPDATE statement because column x doesn't exist. What's the conventional way to deal with this, it must come up all the time? I can work around it by putting the UPDATE inside EXEC, is there another/better way? Thanks

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• C++, Searching and returning value.

  - by pure841

  For example, lets say I have this string: "Name, Name2, <b>Name3</b>, Name4, <b>Name5</b>" I am trying to get whatever value / name is inside the <b> tags. So when I search the char, I get the following in an array: Name3 Name5 Any ideas? Thanks

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