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  • Unix Interview Question [closed]

    - by Rachel
    I am giving some interviews right now and recently I was asked this questions in Interview and I was not sure of the answer, in your opinion are this kind of questions worthwhile for Interview process and if yes than how would you go about approaching this kind of questions. How to get number of files in directory without using wc ? How to get all files in descending order on size ? What is the significance of ? in file searching ? Would appreciate if you can provide answers for this questions so that I could learn something about them as I am not sure for this questions.

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  • C++ find method is not const?

    - by Rachel
    I've written a method that I'd like to declare as const, but the compiler complains. I traced through and found that this part of the method was causing the difficulty: bool ClassA::MethodA(int x) { bool y = false; if(find(myList.begin(), myList.end(), x) != myList.end()) { y = true; } return y; } There is more happening in the method than that, but with everything else stripped away, this was the part that didn't allow the method to be const. Why does the stl find algorithm prevent the method from being const? Does it change the list in any way?

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  • Language Agnositc Basic Programming Question

    - by Rachel
    This is very basic question from programming point of view but as I am in learning phase, I thought I would better ask this question rather than having an misunderstanding or narrow knowledge about the topic. So do excuse me if somehow I mess it up. Question: Let say I have class A,B,C and D now class A has some piece of code which I need to have in class B,C and D so I am extending class A in class B, class C, and class D Now how can I access the function of class A in other classes, do I need to create an object of class A and than access the function of class A or as am extending A in other classes than I can internally call the function using this parameter. If possible I would really appreciate if someone can explain this concept with code sample explaining how the logic flows.

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  • WPF - Pausing the UI Thread?

    - by Rachel
    I have a tab control with draggable tabs. When the mouse is released it removes the selected tab from the tabControl and adds it to its new location. My problem is that the TabControl draws itself after removing the tab, and then again when adding the tab so there is a very noticeable flicker that shows the tab behind the tab being moved. Is there a way I can pause the UI thread so the tab control does not redraw until both the Remove and the Insert operations finish? Or perhaps some other alternative way of rearranging the tab items? The Drag/Drop operation exists in a separate code file as an Attached Property

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  • Particular Project Types & Job Responsibility in Financial Industry

    - by Rachel
    I want to gain knowledge about types of projects in Financial Industry and how it is like working for Back Office, Middle Office and Front Office of an Financial Firm. I have gone through How do I start programming in Financial Industry and it is really good but am question is mainly aim at: What typical types of Projects we have in Back Office, Middle Office, Front Office or in any other Financial Firms. I have heard about terms like Derivates Trading, Equity Trading, Banking, Money Market and so what are the types of projects in this areas and what would be a good read or resources to learn about different Financial Sectors and its related projects in each of this sectors. I would really appreciate if people who have worked in Financial Industry to share this knowledge.

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  • Git for Local Branches

    - by Rachel
    How can I differentiate between two local branches in git ? How can I copy one local branch to another local branch ? In general how can I perform difference operation between two local branches on my server using git. I tried looking it up online but there is not enough documentation on that or there is not clear documentation on that. Any suggestions or links to useful material would be highly appreciated. Thanks.

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  • Questions every good PHP Developer should be able to answer

    - by Rachel
    I was going through Questions every good .Net developer should be able to answer and was highly impressed with the content and approach of this question and so in the same spirit, I am asking this question for PHP Developer. What questions do you think should a good PHP programmer be able to respond to? EDIT : I am marking this question as community wiki as it is not user specific and it aims to serve programming community at large. Looking forward for some amazing responses. NOTE : Please answer questions too as suggested in the comments so that people could learn something new too regarding the language.

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  • In PHP, is it possible to create an instance of an class without calling class's constructor ?

    - by Rachel
    By any means, is it possible to create an instance of an php class without calling its constructor ? I have Class A and while creating an instance of it am passing file and in constructor of Class A am opening the file. Now in Class A, there is function which I need to call but am not required to pass file and so there is not need to use constructor functionality of opening file as am not passing file. So my question is, Is it possible by any means to create an instance of an PHP class without calling its constructor ?

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  • NewBie Question, jQuery: How can we implement if...else logic and call function

    - by Rachel
    I am new to jQuery and so don't mind this question if it sounds stupid but here is something that I am trying to do : I have 3 functions like: AddToCart Function which adds item to the shopping cart: //offer_id is the offer which we are trying to add to cart. addToCart: function(offer_id) { this.submit({action: 'add', 'offer_id': offer_id}, {'app_server_url': this.app_server_url}); }, RemoveFromCart which removes data from the cart //target is link clicked and event is the click event. removeFromCart: function(target, event) { this.uniqueElmt('cart_table').find('.sb_item_remove').unbind('click'); var offer_id = $(target).parent().find('.offer_id').html(); this.submit({action: 'remove', 'offer_id': offer_id, 'next_action': this.config.current_action}, {'app_server_url': this.app_server_url}); }, Get the current state of the cart //return string which represents current state of cart. getCartItems: function() { return this.contents; } Now I am trying to do 3 things: if there is no content in cart and addToCart is called than some action, so basically here we need to check the current state of cart and that is obtained by calling getCartItems and if it is Null and than if addToCart is called than we perform some action if there is content in the cart and addToCart is called than some action,so basically here we need to check the current state of cart and that is obtained by calling getCartItems and check if it is Null or not and than if addToCart is called than we perform some action if we had some content in the cart. if there is content in the cart and removeFromCart is called some action, so basically here we need to check the current state of cart and that is obtained by calling getCartItems and if it is not Null and if removeFromCart is called than we perform some action Pseudocode of what I am trying to do: if there is no content in cart and addToCart is called than $(document).track( { 'module' : 'Omniture', 'event' : 'instant', 'args' : { 'linkTrackVars' : 'products,events', 'linkTrackEvents' : 'scAdd,scOpen', 'linkType' : 'o', 'linkName' : 'Cart : First Product Added' // could be blank, but can include event name as added feature 'svalues' : { 'products' : ';OFFERID1[,;OFFERID2]', 'events' : 'scAdd,scOpen', }, } 'defer' : '0' } ); if there is content in the cart and addToCart is called than $(document).track( { 'module' : 'Omniture', 'event' : 'instant', 'args' : { 'linkTrackVars' : 'products,events', 'linkTrackEvents' : 'scAdd', 'linkType' : 'o', 'linkName' : 'Cart : Product Added' // could be blank, but can include event name as added feature 'svalues' : { 'products' : ';OFFERID1[,;OFFERID2]', 'events' : 'scAdd', }, }, 'defer' : '0' } ); if there is content in the cart and removeFromCart is called $(document).track( { 'module' : 'Omniture', 'event' : 'instant', 'args' : { 'linkTrackVars' : 'products,events', 'linkTrackEvents' : 'scRemove', 'linkType' : 'o', 'linkName' : 'Cart : Product Removed' // could be blank, but can include event name as added feature 'svalues' : { 'products' : ';OFFERID1[,;OFFERID2]', 'events' : 'scRemove', }, } 'defer' : '0' } ); My basic concern is that am complete newbie to jQuery and JavaScript and so am not sure how can I implement if...else logic and how can I call a funtion using jQuery/JavaScript.

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  • Implement functionality in PHP?

    - by Rachel
    How can we Implement Bisect Python functionality in PHP Implement function bisect_left($arr, $item); as a pure-PHP routine to do a binary-bisection search for the position at which to insert $item into $list, maintaining the sort order therein. Assumptions: Assume that $arr is already sorted by whatever comparisons would be yielded by the stock PHP < operator, and that it's indexed on ints. The function should return an int, representing the index within the array at which $item would be inserted to maintain the order of the array. The returned index should be below any elements in $arr equal to $item, i.e., the insertion index should be "to the left" of anything equal to $item. Search routine should not be linear! That is, it should honor the name, and should attempt to find it by iteratively bisecting the list and comparing only around the midpoint.

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  • How to work with file and streams in php,case: if we open file in Class A and pass open stream to Cl

    - by Rachel
    I have two class, one is Business Logic Class{BLO} and the other one is Data Access Class{DAO} and I have dependency in my BLO class to my Dao class. Basically am opening a csv file to write into it in my BLO class using inside its constructor as I am creating an object of BLO and passing in file from command prompt: Code: $this->fin = fopen($file,'w+') or die('Cannot open file'); Now inside BLO I have one function notifiy, which call has dependency to DAO class and call getCurrentDBSnapshot function from the Dao and passes the open stream so that data gets populated into the stream. Code: Blo Class Constructor: public function __construct($file) { //Open Unica File for parsing. $this->fin = fopen($file,'w+') or die('Cannot open file'); // Initialize the Repository DAO. $this->dao = new Dao('REPO'); } Blo Class method that interacts with Dao Method and call getCurrentDBSnapshot. public function notifiy() { $data = $this->fin; var_dump($data); //resource(9) of type (stream) $outputFile=$this->dao->getCurrentDBSnapshot($data); // So basically am passing in $data which is resource((9) of type (stream) } Dao function: getCurrentDBSnapshot which get current state of Database table. public function getCurrentDBSnapshot($data) { $query = "SELECT * FROM myTable"; //Basically just preparing the query. $stmt = $this->connection->prepare($query); // Execute the statement $stmt->execute(); $header = array(); while ($row=$stmt->fetch(PDO::FETCH_ASSOC)) { if(empty($header)) { // Get the header values from table(columnnames) $header = array_keys($row); // Populate csv file with header information from the mytable fputcsv($data, $header); } // Export every row to a file fputcsv($data, $row); } var_dump($data);//resource(9) of type (stream) return $data; } So basically in am getting back resource(9) of type (stream) from getCurrentDBSnapshot and am storing that stream into $outputFile in Blo class method notify. Now I want to close the file which I opened for writing and so it should be fclose of $outputFile or $data, because in both the cases it gives me: var_dump(fclose($outputFile)) as bool(false) var_dump(fclose($data)) as bool(false) and var_dump($outputFile) as resource(9) of type (Unknown) var_dump($data) as resource(9) of type (Unknown) My question is that if I open file using fopen in class A and if I call class B method from Class A method and pass an open stream, in our case $data, than Class B would perform some work and return back and open stream and so How can I close that open stream in Class A's method or it is ok to keep that stream open and not use fclose ? Would appreciate inputs as am not very sure as how this can be implemented.

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  • Issue with XSL Criteria

    - by Rachel
    I am using the below piece of XSL to select the id of the text nodes whose content has a given index. This index value in input will be relative to a spcified node whose id value is known. The criteria to select the text node is, The text node content should contain a index say 'i' relative to node say 'n' whose id value i know. 'i' and 'id of n' is got as index and nodeName from the input param as seen in the xsl. Node 'd1e5' has the text content whose index ranges from 1 to 33. When i give an index value greater than 33 i want the below criteria to fail but it does not, [sum((preceding::text(), .)[normalize-space()][. >> //*[@id=$nodeName]]/string-length(.)) ge $index] Input xml: <?xml version="1.0" encoding="UTF-8"?> <html xmlns="http://www.w3.org/1999/xhtml" id="d1e1"> <head id="d1e3"> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> <title id="d1e5">Every document must have a title</title> </head> <body id="d1e9"> <h1 id="d1e11" align="center">Very Important Heading</h1> <p id="d1e13">Since this is just a sample, I won't put much text here.</p> </body> </html> XSL code used: <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:xsd="http://www.w3.org/2001/XMLSchema" exclude-result-prefixes="xsd" version="2.0"> <xsl:param name="insert-file" as="node()+"> <insert-data><data index="1" nodeName="d1e5"></data><data index="34" nodeName="d1e5"></data></insert-data> </xsl:param> <xsl:param name="nodeName" as="xsd:string" /> <xsl:variable name="main-root" as="document-node()" select="/"/> <xsl:variable name="insert-data" as="element(data)*"> <xsl:for-each select="$insert-file/insert-data/data"> <xsl:sort select="xsd:integer(@index)"/> <xsl:variable name="index" select="xsd:integer(@index)" /> <xsl:variable name="nodeName" select="@nodeName" /> <data text-id="{generate-id($main-root/descendant::text()[sum((preceding::text(), .)[normalize-space()][. >> //*[@id=$nodeName]]/string-length(.)) ge $index][1])}"> </data> </xsl:for-each> </xsl:variable> <xsl:template match="/"> <Output> <xsl:copy-of select="$insert-data" /> </Output> </xsl:template> </xsl:stylesheet> Actual output: <?xml version="1.0" encoding="UTF-8"?> <Output> <data text-id="d1t8"/> <data text-id="d1t14"/> </Output> Expected output: <?xml version="1.0" encoding="UTF-8"?> <Output> <data text-id="d1t8"/> </Output> This solution works fine if index lies between 1 and 33. Any index value greater that 33 causes incorrect text nodes to get selected. I could not understand why the text node 'd1t14' is getting selected. Please share your thoughts.

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  • Recursively MySQL Query

    - by Rachel
    How can I implement recursive MySQL Queries. I am trying to look for it but resources are not very helpful. Trying to implement similar logic. public function initiateInserts() { //Open Large CSV File(min 100K rows) for parsing. $this->fin = fopen($file,'r') or die('Cannot open file'); //Parsing Large CSV file to get data and initiate insertion into schema. $query = ""; while (($data=fgetcsv($this->fin,5000,";"))!==FALSE) { $query = $query + "INSERT INTO dt_table (id, code, connectid, connectcode) VALUES (" + $data[0] + ", " + $data[1] + ", " + $data[2] + ", " + $data[3] + ")"; } $stmt = $this->prepare($query); // Execute the statement $stmt->execute(); $this->checkForErrors($stmt); } @Author: Numenor Error Message: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '0' at line 1 This Approach inspired to look for an MySQL recursive query approach.

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  • Questions every good Java/J2EE Developer should be able to answer?

    - by Rachel
    I was going through Questions every good .Net developer should be able to answer and was highly impressed with the content and approach of this question, and so in the same spirit, I am asking this question for Java/J2EE Developer. What questions do you think should a good Java/J2EE programmer be able to answer? I am marking this question as community wiki as it is not user specific and it aims to serve programming community at large. Looking forward for some amazing responses. EDIT: Please answer questions too, as suggested in the comments, so that people could learn something new regarding the language, too.

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  • Regex - How can I achieve this ?

    - by Rachel
    I have regex as /^[a-zA-Z ]+$/ now I need to add support for unicode characters and so am using \p{L} like '/^[a-zA-Z ]+$\p{L}/'. This is not working for me and I am not sure that this is correct way of using it. I am new to regex and would appreciate any guidance. Thanks.

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  • How to remove multiple instances and just have one instance while multiple function calls in php ?

    - by Rachel
    public function getHelperInstance() { $user = new Helper(); $user->set($result['data']); return $user; } I am calling getHelper() class multiple times and if $user is not empty than am calling getHelperInstance(), now in my case getHelperInstance() always creates a new instance of Helper() class and so every time I call getHelperInstance() function am creating a new instance of Helper() so is there any way where can I can just create one instance of Helper() and use it multiple times instead of creating a new instance everytime. Any suggestions !!! public function getHelper() { $user = array(); if (!empty($user)) { $user = $this->getHelperInstance(); } return $user; }

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  • Display DateTime in GridView using user's time

    - by Rachel Martin
    I have a DateTime stored in UTC time that I'd like to display to the user in their local time from within a GridView control. How can I convert my DateTime to the user's time (not my server's local time)? Here is my current field as it appears in the GridView Columns collection: <asp:BoundField DataField="RunTime" HeaderText="Run Time" SortExpression="RunTime" DataFormatString="{0:f}" />

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  • How to populate the span tags for all text nodes between specific self closing tags.

    - by Rachel
    I want to populate span tags for all text nodes between the self closing tags s1 and s2 having the same id. Eg. For the input: <a> <b>Some <s1 id="1" />text here</b> <c>Some <s2 id="1"/>more text <s1 id="2"/> here<c/> <d>More data</d> <e>Some <s2 id="2" />more data</e> </a> In the above input i want to enclose every text node between <s1 id="1"/> and <s2 id="1" /> with span tags. Also all the text node between <s1 id="2" /> and <s2 id="2" /> Expected Output: <a> <b>Some <span class="spanClass" id="1a">text here</span></b> <c><span class="spanClass" id="1b">Some </span>more text <span class="spanClass" id="2a"> here</span></c> <d><span class="spanClass" id="2b">More data</span></d> <e><span class="spanClass" id="2c">Some </span>more data</e> </a> I am not concened about the pattern of the id tag populated for the span as along it is unique. If the transformation of the input to the output form requires the list of ids of the s1 , s2 tag pairs say 1, 2 etc i can assume that it in place in any form if required. Hope i am clear. How can this be achieved using XSL? EDIT: The input can have any structure and not exactly the same as seen in the sample input. It can have any number of s1, s2 tag pairs but each pair will have a unique id.Adding another sample input and output pattern for more information. Input: <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>This is my title</title> </head> <body> <h1 align="center">This <s1 id="1" />is my <s2 id="1" />heading</h1> <p> Sample content <s1 id="2" />Some text here. Some content here. </p> <p> Here you <s2 id="2" />go. </p> </body> </html> Desired output: <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>This is my title</title> </head> <body> <h1 align="center">This <span id="1">is my </span>heading</h1> <p> Sample content <span id="2">Some text here. Some content here.</span> </p> <p> <span id="2">Here you </span>go. </p> </body> </html>

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  • Date validation in PHP

    - by Rachel
    What would the regex expression that would go into preg_split function to validate date in the format of 7-Mar-10 or how can I validate a date of format 7-Mar-10 in PHP Thanks.

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  • Git : How to revert bulk commits on multiple repos

    - by Rachel
    To update my multiple repos, I did: git bulk fetch origin git bulk pull origin master Now it appears that some of the functionality which was working initially is not working now and so I want to revert back to previous state of my repos. How can this be done ? I tried doing git reset --soft commit id & git reset --hard commit id for one repos but it is not working. Any suggestions.

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  • Alter Dilemma : How to use to set Primary and other attributes.

    - by Rachel
    I have following table in database AND I need to alter it to below mentioned schema. Initially I was drop the current database and creating new one using the create but I am not supposed to do that and use ALTER but am not sure as to how can I use ALTER to add primary key and other constraints. Any Suggestions !!! Code Current: CREATE TABLE `details` ( `KEY` varchar(255) NOT NULL, `ID` bigint(20) NOT NULL, `CODE` varchar(255) NOT NULL, `C_ID` bigint(20) NOT NULL, `C_CODE` varchar(64) NOT NULL, `CCODE` varchar(255) NOT NULL, `TCODE` varchar(255) NOT NULL, `LCODE` varchar(255) NOT NULL, `CAMCODE` varchar(255) NOT NULL, `OFCODE` varchar(255) NOT NULL, `OFNAME` varchar(255) NOT NULL, `PRIORITY` bigint(20) NOT NULL, `STDATE` datetime NOT NULL, `ENDATE` datetime NOT NULL, `INT` varchar(255) NOT NULL, `PHONE` varchar(255) NOT NULL, `TV` varchar(255) NOT NULL, `MTV` varchar(255) NOT NULL, `TYPE` varchar(255) NOT NULL, `CREATED` datetime NOT NULL, `MAIN` varchar(255) NOT NULL ) ENGINE=MyISAM DEFAULT CHARSET=latin1; Desired: CREATE TABLE `details` ( `id` bigint(20) NOT NULL, `code` varchar(255) NOT NULL, `cid` bigint(20) NOT NULL, `ccode` varchar(64) NOT NULL, `c_code` varchar(255) NOT NULL, `tcode` varchar(255) NOT NULL, `lcode` varchar(255) NOT NULL, `camcode` varchar(255) NOT NULL, `ofcode` varchar(255) NOT NULL, `ofname` varchar(255) NOT NULL, `priority` bigint(20) NOT NULL, `stdate` datetime NOT NULL, `enddate` datetime NOT NULL, `list` varchar(255) NOT NULL, `name` varchar(255) NOT NULL, `created` datetime NOT NULL, `date` datetime NOT NULL, `ofshn` int(20) NOT NULL, `ofcl` int(20) NOT NULL, `ofr` int(20) NOT NULL, PRIMARY KEY (`code`,`ccode`,`list`) ) ENGINE=MyISAM DEFAULT CHARSET=latin1; Thanks !!!

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