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  • Do bit operations cause programs to run slower?

    - by flashnik
    I'm dealing with a problem which needs to work with a lot of data. Currently its values are represented as an unsigned int. I know that real values do not exceed a limit of 1000. Questions I can use unsigned short to store it. An upside to this is that it'll use less storage space to store the value. Will performance suffer? If I decided to store data as short but all the calling functions use int, it's recognized that I need to convert between these datatypes when storing or extracting values. Will performance suffer? Will the loss in performance be dramatic? If I decided to not use short but just 10 bits packed into an array of unsigned int. What will happen in this case comparing with previous ones?

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  • Getting value of LSB from Hex (C code)

    - by Rjff
    Hi - first post here :) I've got a code like this in C: unsigned char const data[ ] = {0x0a, 0x1d, 0xf0, 0x07}; I need to extract it such that the final value is: 0xa1df7 I have only been able to extract and get it working if the hex values that have at least 1 zero: unsigned char const data[ ] = {0x0a, 0xd0, 0xf0, 0x07}; using the code below: for(int i = 0; i < SIZE; ++i) { tmp = data[i]; if ( (data[i] <= 0x0F) && (((data[i] & 0x0F) == 0) || (data[i] & 0xF0) == 0)) // one of the hex is zero { tmp = ((tmp << 4) >> 4) << N[i]; std::cout << "foo: " << std::hex << tmp << ":" << std::endl; } else if ((data[i] >= 0x0F) && (((data[i] & 0x0F) == 0) || (data[i] & 0xF0) == 0) ) { tmp = (tmp >> 4) << N[i]; std::cout << "bar: " << std::hex << tmp << ":" << std::endl; } else { std::cout << "result: " << std::hex << result << ":" << std::endl; std::cout << "tmp << 8: " << std::hex << (tmp << 8)<< ":" << std::endl; result = result | (tmp << 8); std::cout << "result |= (tmp << 8): " << std::hex << result << ":" << std::endl; } result |= tmp; std::cout << "boo: " << std::hex << result << ":" << std::endl; } It seems the last else {...} block is troublesome for me. Any ideas? Thanks!

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  • Masking a bit in C returning unexpected result

    - by Eamorr
    0x7F000000 is 0111 1111 0000 0000 0000 0000 0000 0000 in 32 bit binary. 0x01000058 is 0000 0001 0000 0000 0000 0000 0101 1000. When I AND the two numbers together I expect 0000 0001 0000 0000 0000 0000 0000 0000, but for some reason I get 0. Here is my code: #define MASK_binop 0x80000000 #define MASK_operation 0x7F000000 int instruction=atoi(line); if((MASK_binop & instruction)>0) printf("binop\n"); else if((MASK_operation & instruction)>0) printf("operation\n"); Each of the above comparisons keeps returning zero. Is it something to do with 32/64 bits? I'm using 64-bit compiler.

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  • Replacing text after node

    - by Andrew
    I am trying to remove the "Hide this data" from this XML which is proceeded with the qualifier type="noView" <element version="Local"> <qualifier name="Public" type="View" /> Good to go </element> <element version="Local"> <qualifier name="Public" type="noView" /> Hide this data </element> I am using this XSL <?xml version="1.0"?> <xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"> <xsl:template match="node()|@*"> <xsl:copy> <xsl:apply-templates select="@*"/> <xsl:apply-templates/> </xsl:copy> </xsl:template> <xsl:template match="qualifier"> <xsl:call-template name="replace-noview" /> </xsl:template> <xsl:template name="replace-noview"> <xsl:param name="text" select="@type"/> <xsl:choose> <xsl:when test="contains($text, 'noView')"> <xsl:copy-of select="."/> <xsl:text>DELETED</xsl:text> </xsl:when> <xsl:otherwise> <xsl:copy-of select="."/> </xsl:otherwise> </xsl:choose> </xsl:template> The output I'm getting is <element identifier="ContactName" version="Local"> <qualifier name="Public" type="View" /> Good to go </element> <element identifier="ContactName" version="Local"> <qualifier name="Public" type="noView" />DELETED Hide this data </element> I am matching the "noView" attribute and can add the "DELETED" text. However I need to remove the follow "Hide this data" text. The output I would like is <element identifier="ContactName" version="Local"> <qualifier name="Public" type="View" /> Good to go </element> <element identifier="ContactName" version="Local"> <qualifier name="Public" type="noView" /> DELETED </element>

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  • Highlighting text beween custom tags

    - by Rachel
    In a xhtml, i want to highlight the text between two self closing tags s1 and s2 whose attribute value is the same. Eg. <s1 ind="1"/> and <s2 ind="1" /> Eg. <html> <body> <a> <b>Some <s1 ind="1"/> text</b> <c>data <s2 ind="1"/>here</c> </a> </body> </html> I want "text data" to get highlighted. Is is possible to achieve using javascript/jquery? I could have many such self closing tag pairs s1 and s2 with a unique value for "ind" for the pair indicating that the text within them needs to be highlighted.

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  • Manipulating/changing adressbar link Help

    - by Karem
    I am out of my own "ideas" going through this. I have a album viewer. When you click next I want the adressbar to hang with it, e.g if you start on ?photoid=1, and click next (next picture appends and stuff), and then i want it to say ?photoid=2. Now I cant make it say ?photoid=2 without changing/manipulating, and this you cant do without HTML5. I have made a script in HTML5 that works fine, but then I need to take care of those who dont have HTML5(only chrome, ff4 etc supports html5) Made the script from this( https://developer.mozilla.org/en/DOM/Manipulating_the_browser_history ) I thought of adding #photoid=2 so, ?photoid=1#photoid=2 and then check if theres anything in # then use that instead of the $_GET.. But apparently you cannot do that as # is client side handled and never sent to the server. So what should I then do? Any suggestions please to make a workaround this? I checked facebook, what they did to IE users, and I could hear that it "clicked" (the annoying click sound from IE) twice.. the first was to get to the next picture, the second click sound changed the adressbar?!(how?). And then I also thought hey, html5 is only supported in ff4, and I got ff3.6, and they manipulate the adress bar url when you browse through the album photos, exactly like how I wanted (and what I have written for but it only works in Chrome and ff4..?). How could they do that?

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  • posting array of text fields using jquery and ajax

    - by tabia
    i dont want to use serialize() function please help me with this. I am a beginner html <input type='button' value='Add Tier Flavor' id='Add'> <input type='button' value='Remove Tier Flavor' id='Remove'> <div id='batch'> <div id="BatchDiv1"> <h4>Batch #1 :</h4> <label>Flavor<input class="textbox" type='text' id="fl1" name="fl[]" value=""/></label></br> <label>Filling<input class="textbox" type='text' id="fi1" name="fi[]" value="" /></label></br> <label>Frosting<input class="textbox" type='text' id="fr1" name="fr[]" value=""/></label></br> </div> </div> <br> </div> this is a dynamically added fields using javascript the code is: javascript <script src="http://code.jquery.com/jquery-1.10.1.min.js"></script> <script type="text/javascript"> $(document).ready(function(){ var counter = 2; $("#Add").click(function () { if(counter>5){ alert("Only 5 Tiers allow"); return false; } var newBatchBoxDiv = $(document.createElement('div')).attr("id", 'BatchDiv' + counter); newBatchBoxDiv.html('<h4>Batch #'+ counter + ' : </h4>' + '<label> Flavor<input type="text" name="fl[]" id="fl' + counter + '" value=""></label><br>'+ '<label> Filling<input type="text" name="fi[]" id="fi' + counter + '" value=""></label><br>'+ '<label> Frosting<input type="text" name="fr[]" id="fr' + counter + '" value=""></label><br>' ); newBatchBoxDiv.appendTo("#batch"); counter++; }); $("#Remove").click(function () { if(counter==1){ alert("No more tier to remove"); return false; } counter--; $("#BatchDiv" + counter).remove(); }); }); </script> i am trying to post the values in an array to post it onto next .php page i am using this var user_cupfl = $('input[name^="fl"]').serialize(); var user_cupfi = $('input[name^="fi"]').serialize(); var user_cupfr = $('input[name^="fr"]').serialize(); serialize is not passing the values. :( on second page i am trying to mail it using $message .= "<tr><td><strong>Cake Flavors(according to batches):</strong> </td><td><pre>" .implode("\n", $user_cupfl). "</pre></td></tr>"; $message .= "<tr><td><strong>Filling type (Inside the cake):</strong> </td><td><pre>" .implode("\n", $user_cupfi). "</pre></td></tr>"; $message .= "<tr><td><strong>Frosting type (top of the cake):</strong> </td><td><pre>" .implode("\n", $user_cupfr). "</pre></td></tr>"; i m posting array like this $user_cupfl=filter_var($_POST["userCupfl"], FILTER_SANITIZE_STRING); $user_cupfi=filter_var($_POST["userCupfi"], FILTER_SANITIZE_STRING); $user_cupfr=filter_var($_POST["userCupfr"], FILTER_SANITIZE_STRING); your replies will be highly appreciated

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  • Select all text in an <input /> when it gains focus

    - by Chris Barr
    I've got a textbox (set to readonly) and I need its' contents to be selected for easy copy/paste when it gains focus. Using the code below it only seems to quickly select the text and then unselect it for some reason. HTML <input id='thing' type='text' value='some text' readonly='readonly' />? JavaScript document.getElementById('thing').onfocus = function(){ this.select(); };? Fiddle: http://jsfiddle.net/cfqje/

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  • C#: Label contains no text

    - by Vinzcent
    Hey I would like to get the text out of a label. But the label text is set with Javascript. On the page I can see that there is text in the label, but when I debug it shows this: "". So how do I get the text out of a label that is set with Javascript, at least that is what I think is the problem. My code: <asp:TextBox ID="txtCount" runat="server" Width="50px" Font-Names="Georgia, Arial, sans-Serif" ForeColor="#444444"></asp:TextBox> <ajaxToolkit:NumericUpDownExtender ID="NumericUpDownExtender1" runat="server" Minimum="1" TargetButtonDownID="btnDown" TargetButtonUpID="btnUp" TargetControlID="txtCount" Width="20" /> <asp:ImageButton ID="btnUp" runat="server" AlternateText="up" ImageUrl="Images/arrowUp.png" OnClientClick="setAmountUp()" ImageAlign="Top" CausesValidation="False" /> <asp:ImageButton ID="btnDown" runat="server" AlternateText="down" ImageUrl="Images/arrowDown.png" OnClientClick="setAmountDown()" ImageAlign="Bottom" CausesValidation="False" /> <asp:Label ID="lblKorting" runat="server" /> <asp:Label ID="lblAmount" runat="server" /> <asp:Button ID="btnBestel" runat="server" CssClass="btn" Text="Bestel" OnClick="btnBestel_Click1" /> JS function setAmountUp() { var aantal = document.getElementById('<%=txtCount.ClientID%>').value-0; aantal+=1; calculateAmount(aantal); } function setAmountDown() { var aantal = document.getElementById('<%=txtCount.ClientID%>').value-0; if(aantal > 1) aantal -=1; calculateAmount(aantal); } function calculateAmount(aantal) { var prijs = document.getElementById('<%=lblPriceBestel.ClientID%>').innerHTML -0; var totaal = 0; if(aantal < 2) { totaal = prijs * aantal; document.getElementById('<%=lblKorting.ClientID%>').innerHTML = ""; } else if(aantal >= 2 && aantal < 5) { totaal = (prijs * aantal)*0.95; document.getElementById('<%=lblKorting.ClientID%>').innerHTML = "-5%"; } else if(aantal >= 5) { totaal = (prijs * aantal)*0.90; document.getElementById('<%=lblKorting.ClientID%>').innerHTML = "-10%"; } document.getElementById('<%=lblAmount.ClientID%>').innerHTML = totaal; } C# private OrderBO bestelling; protected void btnBestel_Click1(object sender, EventArgs e) { bestelling = new OrderBO(); bestelling.Amount = Convert.ToInt32(lblAmount.Text); //<--- THIS IS "" in the debugger, but on the page 10 }

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  • Replacing text with a link in jQuery

    - by Eli
    I'm trying to replace a small part of text in a large HTML document with my own element which I create on the fly. The text may be a huge bulk of text, html, images, what-ever, and what I want is to find the first (or all) the position of a certain string, and replace it with an element that I create using $('< span'). Using simple text.replace('the string', $('< span')); doesn't do the trick (I'm left with [object Object] and not the actual < span that I want. The reason I don't just inject direct HTML is because I want to retain all the binds that are related to the object I'm creating. and doing a replace with a custom ID, and then attaching binds to the ID after the HTML has been altered, seems a bit dirty. Thanks for the help! :)

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  • how to enter text into uitextfield

    - by adnan
    I have implemented the delegates for UITextField and also method for these text field. Below are the methods: - (void)textFieldDidBeginEditing:(UITextField *)textField { [textField resignFirstResponder]; } - (BOOL)textFieldShouldReturn:(UITextField *)aTextField { [aTextField resignFirstResponder]; return YES; } My problem is that when I want to enter text into UITextField its delegate does not allow me to enter the text into textfields. Kindly tell me how i can enter the data into textfields

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  • Windows batch/script code to conditionally process based on date value in text file

    - by CarolinaJay65
    I am using Windows XP. The code can be used in a batch file or vbs script. I intend to use Windows scheduler to run the program. I need code to read a date from a text file (could be the only line in the text file or the date could be included in the filename, I control the process that generates the file) The code would then need to evaluate the text file date against the current date to confirm that the text file date is from the prior month. I'm starting to build a process to be able to run 1st-of-the-month jobs once the monthly data has been refreshed. I'm new to building this kind of process using batch/script files. Thanks for your time

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  • Removing the last character of a string IF it is $variable

    - by KeenLearner
    Hi there, I've made a little script to convert titles into url friendly things. ie: 'I am a title' becomes 'I_am_a_title' My script basically goes through and turns spaces, apostrophes, commas etc etc into an underscore. The problem is, sometimes my url's end up like this: 'i_am_a_title_' with a trailing underscore... So i figure, add a little bit to go through and search to see if the last character is an underscore on the final result, and if it is, then swap it. I looked into the strrchr() function but I seem to be hitting a wall of my own understanding. How is this sort of thing accomplished?

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  • Drawbacks of using an integer as a bitfield?

    - by Mark
    I have a bunch of boolean options for things like "accepted payment types" which can include things like cash, credit card, cheque, paypal, etc. Rather than having a half dozen booleans in my DB, I can just use an integer and assign each payment method an integer, like so PAYMENT_METHODS = ( (1<<0, 'Cash'), (1<<1, 'Credit Card'), (1<<2, 'Cheque'), (1<<3, 'Other'), ) and then query the specific bit in python to retrieve the flag. I know this means the database can't index by specific flags, but are there any other drawbacks?

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  • java phone number validation....

    - by user69514
    Here is my problem: Create a constructor for a telephone number given a string in the form xxx-xxx-xxxx or xxx-xxxx for a local number. Throw an exception if the format is not valid. So I was thinking to validate it using a regular expression, but I don't know if I'm doing it correctly. Also what kind of exception would I have to throw? Do I need to create my own exception? public TelephoneNumber(String aString){ if(isPhoneNumberValid(aString)==true){ StringTokenizer tokens = new StringTokenizer("-"); if(tokens.countTokens()==3){ areaCode = Integer.parseInt(tokens.nextToken()); exchangeCode = Integer.parseInt(tokens.nextToken()); number = Integer.parseInt(tokens.nextToken()); } else if(tokens.countTokens()==2){ exchangeCode = Integer.parseInt(tokens.nextToken()); number = Integer.parseInt(tokens.nextToken()); } else{ //throw an excemption here } } } public static boolean isPhoneNumberValid(String phoneNumber){ boolean isValid = false; //Initialize reg ex for phone number. String expression = "(\\d{3})(\\[-])(\\d{4})$"; CharSequence inputStr = phoneNumber; Pattern pattern = Pattern.compile(expression); Matcher matcher = pattern.matcher(inputStr); if(matcher.matches()){ isValid = true; } return isValid; } Hi sorry, yes this is homework. For this assignments the only valid format are xxx-xxx-xxxx and xxx-xxxx, all other formats (xxx)xxx-xxxx or xxxxxxxxxx are invalid in this case. I would like to know if my regular expression is correct

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  • Tear subString from within HTML tags with JAVA

    - by asaf
    Hi! let say i have a string like this "neverMindWhat is upneverMind" and I want to take out the What is up using regexp with JAVA. Someone told me that using matcher will be the best. Can anyone show me how to do it using Matcher? Other solutions are welcome too! Thanks!

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  • I need to pad IP addresses with Zeroes for each octet

    - by Felipe Alvarez
    Starting with a string of an unspecified length, I need to make it exactly 43 characters long (front-padded with zeroes). It is going to contain IP addresses and port numbers. Something like: ### BEFORE # Unfortunately includes ':' colon 66.35.205.123.80-137.30.123.78.52172: ### AFTER # Colon removed. # Digits padded to three (3) and five (5) # characters (for IP address and port numbers, respectively) 066.035.05.123.00080-137.030.123.078.52172 This is similar to the output produced by tcpflow. Programming in Bash. I can provide copy of script if required. If it's at all possible, it would be nice to use a bash built-in, for speed. Is printf suitable for this type of thing?

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  • parse this directory path without losing slash

    - by PPTim
    hi, I have a wxPython application. I am taking in a directory path from a textbox using GetValue(). I notice that while trying to parse in the directory path "C:\Documents and Settings\UserName\Desktop\InputFile.xls", python sees the string as 'C:\\Documents and Settings\UserName\\Desktop\\InputFile.xls' (missing a slash between "Settings" and "UserName). Why is it that only that slash is not correctly escaped? Once the string has been changed to 'C:\Documents and Settings\UserName\Desktop\InputFile.xls', is there a type conversion or function that can does this properly? Thanks.

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