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  • C++ Inheritance and Constructors

    - by DizzyDoo
    Hello, trying to work out how to use constructors with an inherited class. I know this is very much wrong, I've been writing C++ for about three days now, but here's my code anyway: clientData.h, two classes, ClientData extends Entity : #pragma once class Entity { public: int x, y, width, height, leftX, rightX, topY, bottomY; Entity(int x, int y, int width, int height); ~Entity(); }; class ClientData : public Entity { public: ClientData(); ~ClientData(); }; and clientData.cpp, which contains the functions: #include <iostream> #include "clientData.h" using namespace std; Entity::Entity(int x, int y, int width, int height) { this->x = x; this->y = y; this->width = width; this->height = height; this->leftX = x - (width/2); this->rightX = x + (width/2); this->topY = y - (height/2); this-bottomY = y + (height/2); } Entity::~Entity() { cout << "Destructing.\n"; } ClientData::ClientData() { cout << "Client constructed."; } ClientData::~ClientData() { cout << "Destructing.\n"; } and finally, I'm creating a new ClientData with: ClientData * Data = new ClientData(32,32,32,16); Now, I'm not surprised my compiler shouts errors at me, so how do I pass the arguments to the right classes? The first error (from MVC2008) is error C2661: 'ClientData::ClientData' : no overloaded function takes 4 arguments and the second, which pops up whatever changes I seem to make is error C2512: 'Entity' : no appropriate default constructor available Thanks.

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  • Same script, working on a site, not working on the other!

    - by Tioneb
    Hello, First of all I apologize in advance for this question, a bit off the rang of stackoverflow, but I've spend a day trying to solve that issue and I'm totally stuck. The issue: The search function of my script (php) works perfectly fine on one host but not on the other. If you search something here : edu-cafe.com, you'll get a result, just as it should be. However, try a search on this site, hosted somewhere else : code-reduc.com, exact same script, files and datable, and it just hang. I've asked both the host and the original programmer of the script to look at the issue but they can't seem to find an answer... Obviously the cause of my troubles comes from the Host, but I can't find the issue Any bit of help would be hugely appreciated! PS: part of the script here: http://codepaste.net/fuymqn Thanks!

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  • Express one dimension of 2d array as new array

    - by user208080
    I have a 2d array a[3,3]. How can I express one dimension as a new array and pass it to some function? int[,] a = new int[3,3]; a[0,0] = 1; ... string b = concatenate(a[0]); // where concatenate is a function // take a one dimension array as param Also, can I create a 65000x65000 array with C#? I got some "out of memory" error.

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  • Understanding PHP's way of reading if statements

    - by Masi
    How does PHP read if statements? I have the following if statements in this order if ( $number_of_figures_in_email < 6) { -- cut: gives false } if($number_of_emails > 0) { -- cut: gives false } if ( $number_of_emails == 0) { -- cut: gives true } The code behaves randomly. It sometimes goes to the third if clause and gives me a success, while sometimes to the one of the first two if clauses when the input variables are constant. This suggests me that I cannot code only with if statements.

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  • Beginning PHP for someone interested in Security

    - by MaXX
    I'd like to learn PHP specifically for dealing with security vulnerabilities/exploits. Could someone recommend a book? I don't know if I need to learn HTML/CSS/XML/XHTML etc, do I have to learn those too? I don't really plan on designing websites, could anyone help me with this? :P

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  • What is the security risk of object reflection?

    - by Legend
    So after a few hours of workaround the limitation of Reflection being currently disabled on the Google App Engine, I was wondering if someone could help me understand why object reflection can be a threat. Is it because I can inspect the private variables of a class or are there any other deeper reasons?

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  • technology for new webproject?

    - by elCapitano
    Hi there, i am planing to set up a new webproject which has to use a database and a model which can be presented in a browser. I looked at a lot of technologies (JSF, PHP, ..) but i could not find a free and easy framework/technology for me (in the end i prefered asp.net, but this is not free). What can you recommend me for a new webproject from scratch?

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  • How to do a random-and-unique generator?

    - by javaLearner.java
    I already wrote a random generator which take arguments a and b, where a is minimun and b is maximum value, like this randomGenerator(int a, int b) What I want to do next is: Using a loop, then generate unique number from a to b. Example: I want to have 8 unique numbers, int a = 1; int b = 10; int value; If I do the loop, there is a high % that same number will appear more than once. Any idea how to do it? My own way is: while(int i <= 8){ randomGenerator(a,b); // if value is not in array, then insert into array } I am stuck at the comment part. Is there any way to check if a variable is exists in an array?

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  • Python script to remove lines from file containing words in array

    - by chromesub
    I have the following script which identifies lines in a file which I want to remove, based on an array but does not remove them. What should I change? sourcefile = "C:\\Python25\\PC_New.txt" filename2 = "C:\\Python25\\PC_reduced.txt" offending = ["Exception","Integer","RuntimeException"] def fixup( filename ): print "fixup ", filename fin = open( filename ) fout = open( filename2 , "w") for line in fin.readlines(): for item in offending: print "got one",line line = line.replace( item, "MUST DELETE" ) line=line.strip() fout.write(line) fin.close() fout.close() fixup(sourcefile)

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  • Where I get wrong?

    - by Ole Jak
    I have PHP code like this require_once( "includes" . DIRECTORY_SEPARATOR . "constants.php"); $userID = validKey( $key ); $query = "select a.username, b.streamID from user a, streams b where a.id = b.userID;)"; $connection = mysql_connect(DB_SERVER,DB_USER,DB_PASS); if (!$connection) { die("Database connection failed: " . mysql_error()); } $db_select = mysql_select_db(DB_NAME,$connection); if (!$db_select) {die( "Database selection failed: " . mysql_error()); } $generated_table = mysql_fetch_array(mysql_query($query, $connection)); // line (*) print_r($generated_table); But PHP gives me error/worning and does not print anything out Warning: mysql_fetch_array() expects parameter 1 to be resource, boolean given on line (*) 1) Why It does not printed me anything out 2) Where am I wrong?

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  • Codeigniter: State Machine how to

    - by Kevin Brown
    I created a db row called "activity_state" to denote which things a user has and hasn't completed. The problem is, I don't know how to use it... How can I use this single row to determine what a user has done? ie. have they completed their profile?, have they completed an assignment? Someone mentioned using it as a bitfield, but I'm unfamiliar with that. Is that a good idea? Any ideas?

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  • What is the last entry in an unfilled array (C++)?

    - by jwaffe
    I put C++ because I'm just starting in C# and I'm not sure if there's a difference. if you declare an array char arr[10] and fill in values for arr[0] through arr[8], what value will be put in arr[9]? a space ' '? An endline '\n'? '\0'? Or is it nothing at all? I'm asking this because I've always used tactics like this char word[20]; for(count = 0 ; count < 20 ; count++) { cout << word[count]; } to print the entire contents of an array, and I was wondering if I could simplify it (e.g., if the last entry was '\0') by using something like this char word[20]; while(word[count] != '\0') { cout << word[count]; } that way, I wouldn't have to remember how many pieces of data were entered into an array if all the spaces weren't filled up. If you know an even faster way, let me know. I tend to make a bunch of mistakes on arrays.

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  • Pass reference to ArrayLists to a method.

    - by bhavna raghuvanshi
    here is the whole program: public class ListMerge { public static void main( String[] args) { Scanner input = new Scanner(System.in); System.out.println ("Input length of arraylist 1:"); int n = input.nextInt(); ArrayList x = new ArrayList(); ArrayList y = new ArrayList(); for (int i = 0; i < n; i++) { System.out.println ("Input x[ " + i +"] :" ); x.add(new Integer(i)); } System.out.println ("Input length of arraylist 2:"); int m = input.nextInt(); for (int i = 0; i < m; i++) { System.out.println ("Input y[ " + i +"] :" ); y.add(new Integer(i)); } } list int merge(ArrayList x, ArrayList y) { List all = new ArrayList(); all.addAll(x); all.addAll(y); System.out.println(all); return all; } } also tell me how do i call the function merge?

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  • C++ template restrictions

    - by pingvinus
    I wondering is there any way to set restrictions on template class? Specify that every type substituted in template must have specific ancestor (realize some interface). template < class B > //and every B must be a child of abstract C class A { public: B * obj; int f() { return B::x + this->obj->f(); } }; Like = in haskell func :: (Ord a, Show b) => a -> b -> c

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