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  • The fundamentals of Hash tables?

    - by kylex
    I'm quite confused about the basic concepts of a Hash table. If I were to code a hash how would I even begin? What is the difference between a Hash table and just a normal array? Basically if someone answered this question I think all my questions would be answered: If I had 100 randomly generated numbers (as keys), how would I implement a hash table and why would that be advantageous over an array? Psuedo-code or Java would be appreciated as a learning tool...

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  • NULL value in :conditions =>

    - by Horace Ho
    Contract.all(:conditions => ['voided == ?', 0]).size => 364 Contract.all(:conditions => ['voided != ?', 0]).size => 8 Contract.all.size => 441 the 3 numbers does not added up (364 + 8 != 441). What's the proper way write the :conditions to count the rows which the voided column value is NULL or equal to zero?

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  • Cheap and cheerful rand() replacement.

    - by Mick
    After profiling a large game playing program, I have found that the library function rand() is consuming a considerable fraction of the total processing time. My requirements for the random number generator are not very onerous - its not important that it pass a great battery of statistical tests of pure randomness. I just want something cheap and cheerful that is very fast. Any suggestions?

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  • Sanitize GET query with Apache

    - by Freelancer
    Hello everyone, I see there's a lot of talk here about how to go about sanitizing data. Could it be as simple as adding this rewrite rule to .htaccess? RewriteRule ^([\w\-]+)$ index.php?page=$1 To my understanding this will allow only letters, numbers, _ and - in $1, am I right? If you add to this usage of prepared statements for SQL queries, it should be pretty proof, is that right? Somehow feels like too easy to be true, am I missing something, any ways to firm it up?

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  • How to generate unique serial number of machine in Delphi?

    - by noxwow
    Hi, I have question how to generate unique serial number of machine in Delphi? I tried to do this using the ID the motherboard or processor, but unfortunately it's unfortunately supported. Partition serial numbers, etc. fall off, because it is changing after the formatted. I'm looking for something that doesn't change after the formatted. Has anyone any idea?

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  • Converting a string into a double

    - by Koning Baard
    I am trying to convert a string (const char* argv[]) to a double precision floating point number: int main(const int argc, const char *argv[]) { int i; double numbers[argc - 1]; for(i = 1; i < argc; i += 1) { /* -- Convert each argv into a double and put it in `number` */ } /* ... */ return 0; } Can anyone help me? Thanks

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  • A comprehensive regex for phone number validation

    - by Nicholas Trandem
    I'm trying to put together a comprehensive regex to validate phone numbers. Ideally it would handle international formats, but it must handle US formats, including the following: 1-234-567-8901 1-234-567-8901 x1234 1-234-567-8901 ext1234 1 (234) 567-8901 1.234.567.8901 1/234/567/8901 12345678901 I'll answer with my current attempt, but I'm hoping somebody has something better and/or more elegant.

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  • MySQL: Digits (1.75) to Friendly Time (1 hour and 45 minutes)

    - by Nick
    In my MySQL database, I have a float field named "HoursSpent" with values like "0.25", "1.75", "2.5", etc. Is there a way that I can have my SELECT statement format those values in a friendly format like this?: 0.25 = 15 minutes 1.75 = 1 hour and 45 minutes 2.5 = 2 hours and 30 minutes The "HoursSpent" field is supposed to only have values in 0.25 increments, but if somebody were to put something random like 0.16, it would be nice if the SELECT statement handled that by rounding it up to the nearest 0.25 (so in this case 0.16 would become 0.25, or 15 minutes).

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  • Decimal validation in server side textbox using C#

    - by V.V
    I use this code for decimal validation.It was working fine.but it allow to enter the alphabets into the text box when i exit from the text box the error message will show nearby textbox.I need,if i press the alphabets the text box doesn't allow to enter the text box , how to do this? <asp:RegularExpressionValidator ControlToValidate="txtNumber" runat="server" ValidationExpression="^[1-9]\d*(\.\d+)?$" ErrorMessage="Please enter only numbers"> </asp:RegularExpressionValidator>

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  • Is there a way to check if a var is using setInterval() ?

    - by chadley
    For instance, I am setting an interval like timer = setInterval(fncName, 1000); and if i go and do clearInterval(timer); it does clear the interval but is there a way to check that it cleared the interval? I've tried getting the value of it while it has an interval and when it doesn't but they both just seem to be numbers.

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  • Using two threads and controlling one from the other in java?

    - by sidra
    Can someone please help me out. I need to use two threads in a way that one thread will run permanently while(true) and will keep track of a positioning pointer (some random value coming in form a method). This thread has a logic, if the value equals something, it should start the new thread. And if the value does not equal it should stop the other thread. Can someone give me some code snippet (block level) about how to realize this?

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  • AJAX Div Retrieval every 60 seconds

    - by Sam
    Hello everyone! What I would like to do is retrieve the contents of a PHP file and insert it into a div every 60 seconds, basically refreshing the dynamic div. I've come up with the following code so far, however it doesn't seem to be working. The code is just like this, nothing extra, apart from the MYSQL login. PHP to grab: <?php $time = date("m/d/Y h:i:s a", time()); mysql_query("UPDATE djs SET requesttime='{$time}' WHERE username='{$djs['username']}'") or die(mysql_error()); $request_db = mysql_query("SELECT * FROM requests WHERE haveplayed='0'") or die(mysql_error()); echo "<table style=\"border:1px solid;width:99%;margin-left:auto;margin-right:auto;\" border=\"1\">"; echo "<tr><th>Title</th><th>Artist</th><th>Dedicated To...</th></tr>"; while($request = mysql_fetch_array( $request_db )) { echo "<tr><td style=\"width:33%;padding:1px;\">"; echo $request['SongName']; echo "</td><td style=\"width:33%;\">"; echo $request['Artist']; echo "</td><td style=\"width:33%;\">"; echo $request['DedicatedTo']; echo "</td></tr>"; } echo "</table>"; ?> The original PHP code is just the same, enclosed in a div with an id attribute of 'ajax_table'. The JavaScript is: // JavaScript Document var xmlHttp_moniter function moniter() { xmlHttp_moniter = GetXmlHttpObject_parcel() if(xmlHttp_moniter == null) { alert("browser does not support HTTP Request") return } var url="ajax_table.php?random=" + Math.random() xmlHttp_moniter.onreadystatechange = stateChanged xmlHttp_moniter.open("GET",url,true) xmlHttp_moniter.send(null) } function stateChanged() { if(xmlHttp_moniter.readyState==4 || xmlHttp_moniter.readyState == "complete") { document.getElementById("ajax_table").innerHTML = xmlHttp_moniter.responseText setTimeout('ajax_table()',60000); } } function GetXmlHttpObject_parcel() { var xmlHttp_moniter=null; try { xmlHttp_moniter=new XMLHttpRequest(); } catch (e) { //Internet Explorer try { xmlHttp_moniter=new ActiveXObject("Msxml2.XMLHTTP"); } catch (e) { xmlHttp_moniter=new ActiveXObject("Microsoft.XMLHTTP"); } } return xmlHttp_moniter; } and that is on the page that is requesting the other php page.

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  • Conversion failed when converting the varchar value to data type int

    - by desi
    *I have a varchar(1000) column declared as field that contains all numbers, as shown below. And I want to execute the following script. I need this to work please Declare @PostalCode varchar(1000)=0 set @PostalCode ='7005036,7004168,7002314,7001188,6998955' Select hl.* From CountryLocation cl INNER JOIN refPostalCodes pc ON pc.PostalCode = hl.PostalCode where pc.Postalcode in (@PostalCode) and pc.notDeleted = 1

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  • Set the right two characters (if there are any) to capitals?

    - by Hyflex
    Below is my data: Data Here 94/452O Data more 94/4522i Data bla 94/111 Data bla 94/459es Data bla 94/444 items is automatically generated by some previous code but it could come out like: items = ["Data Here 94/452O", "Data more 94/4522i", "Data bla 94/111", "Data bla 94/459es", "Data bla 94/444"] Now currently I'm appending the following: "\n".join(items).replace("4ke", "9") with a few other .replaces however I want it to replace/change the characters on the end of the numbers with a capital letter instead of lowercase... Output: Data Here 94/452O Data more 94/4522I Data bla 94/111 Data bla 94/459ES Data bla 94/444

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  • Easy Regex question

    - by Aaron
    Trying to replace the first 12 digits of credit card numbers with X's in a predictable blob of text that contains the string: Credit Card Number: 1234123412341234 Here's my PHP function: preg_replace('/Credit Card Number: ([0-9]{12})/','Credit Card Number: XXXXXXXXXXXX',$str); Help?

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  • Latency on mobile networks (Android)

    - by Meep3D
    I am planning to give mobile phone development a shot and was thinking about making some simple multiplayer games. I know latency over local wifi is probably fine but what are the issues with latency over GPRS/3G? I've searched and the best I've seen is someone saying it was 'high', without presenting any concrete numbers. I suppose latency fluctuations are important as well - does anyone have any info on this?

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  • Why does this crash: stringByAppendingFormat

    - by Emil
    Hey. My code crashes at this function (at the stringByAppendingFormat: with error objc_msgSend() selector name: stringByAppendingFormat). This is that line: // imagesPath = ...iPhone Simulator/4.0/Applications/NUMBERS/Documents/images UIImage *image = [[UIImage alloc] initWithContentsOfFile:[imagesPath stringByAppendingFormat:@"/%d.png", [[self.postsArrayID objectAtIndex:row] intValue]]]; Could it have something to do with the retaining of objects? Thanks :)

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  • Silverlight MVVM add record from user control

    - by strattonn
    I have a User Control for searching container numbers. If the user enters a container number that's new to the system then I want to tell the VM "I have a new record to add". The MVVM method avoids using Events to communicate with the VM as they create code-behind. Should I create a Dependency Property to trigger the VM but I don't think I've seen other controls with a "NewRecord" property? Any thoughts?

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