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• Filter design for audio signal.

  - by beanyblue

  What I am trying to do is simple. I have a few .wav files. I want to remove noise and filter out specific frequencies. I don't have matlab and I intend to write my own code for all the filters. Right now, I have a way to read the .wav file and dump out the structure into a text file. My questions are the following: Can I directly apply the digital filters on this sampled data?{ ie, can I directly do a convolution between my input samples and h(n) for the filter function that i choose?). How do I choose the number of coefficients for the Window function? I have octave, so if someone can point me to anything that gives me some idea on how to process the .wav file using octave, that would be great too. I want to be able to filter out the frequency and then listen to the sound again. Is this possible with octave? I'm just a beginner with these kinds of things, so please bear with me if my questions are too naive. Any help will be great.

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• std::bind overload resolution

  - by bpw1621

  The following code works fine #include <functional> using namespace std; using namespace std::placeholders; class A { int operator()( int i, int j ) { return i - j; } }; A a; auto aBind = bind( &A::operator(), ref(a), _2, _1 ); This does not #include <functional> using namespace std; using namespace std::placeholders; class A { int operator()( int i, int j ) { return i - j; } int operator()( int i ) { return -i; } }; A a; auto aBind = bind( &A::operator(), ref(a), _2, _1 ); I have tried playing around with the syntax to try and explicitly resolve which function I want in the code that does not work without luck so far. How do I write the bind line in order to choose the call that takes the two integer arguments?

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• Making more recent items more likely to be drawn

  - by bobo

  There are a few hundred of book records in the database and each record has a publish time. In the homepage of the website, I am required to write some codes to randomly pick 10 books and put them there. The requirement is that newer books need to have higher chances of getting displayed. Since the time is an integer, I am thinking like this to calculate the probability for each book: Probability of a book to be drawn = (current time - publish time of the book) / ((current time - publish time of the book1) + (current time - publish time of the book1) + ... (current time - publish time of the bookn)) After a book is drawn, the next round of the loop will minus the (current time - publish time of the book) from the denominator and recalculate the probability for each of the remaining books, the loop continues until 10 books have been drawn. Is this algorithm a correct one? By the way, the website is written in PHP. Feel free to suggest some PHP codes if you have a better algorithm in your mind. Many thanks to you all.

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• MySQLi Wrapper -- will this slow down performance?

  - by Kerry

  I found the following code on php.net. I'm trying to write a wrapper for the MySQLi library to make things incredibly simple. If this is going to slow down performance, I'll skip it and find another way, if this works, then I'll do that. I have a single query function, if someone passes in more than one variable, I assume the function has to be prepared. The function that I would use to pass in an array to mysqli_stmt_bind_param is call_user_func_array, I have a feeling that is going to slow things down. Am I right? <?php /* just explaining how to call mysqli_stmt_bind_param with a parameter array */ $sql_link = mysqli_connect('localhost', 'my_user', 'my_password', 'world'); $type = "isssi"; $param = array("5", "File Description", "File Title", "Original Name", time()); $sql = "INSERT INTO file_detail (file_id, file_description, file_title, file_original_name, file_upload_date) VALUES (?, ?, ?, ?, ?)"; $sql_stmt = mysqli_prepare ($sql_link, $sql); call_user_func_array('mysqli_stmt_bind_param', array_merge (array($sql_stmt, $type), $param); mysqli_stmt_execute($sql_stmt); ?>

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• How do I trust a self signed cert using https?

  - by dave

  Edit: I originally thought the server's certificate was self signed. Turns out it was signed by a self-signed CA certificate. I'm trying to write a Node.js application that accesses an HTTPS site that's protected using a self-signed certificate certificate signed by a private, self-signed CA certificate. I'd also like to not completely disable certificate checking. I tried putting the self signed certificate server's certificate in the request options, but that doesn't seem to be working. Anyone know how to do this? I expect the following code to print statusCode 200, but instead it prints [Error: SELF_SIGNED_CERT_IN_CHAIN]. I've tried similar code with request with the same results. var https = require('https'); var fs = require('fs'); var opts = { hostname: host, port: 443, path: '/', method: 'GET', ca: fs.readFileSync(serverCertificateFile, 'utf-8') }; var req = https.request(opts, function (res) { console.log('statusCode', res.statusCode); }); req.end(); req.on('error', function (err) { console.error(err); });

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• jQuery: Sustain a hover over two elements

  - by wkdown

  I have an <img> that, once hovered over, animates and fades in the <div> of a larger version of the picture, along with text and a hyperlink. When mousing out, the <div> animates and fades away. This works fine, only my hover function only pertains to the <img> itself. As soon as either a) the <div> appears over the <img>, or b) one mouses off the <img> to get to the <div>, jQuery reads a mouseout and animates the <div> away. How do I re-write my jQuery to allow me to fix this? Thanks in advance ... Here is a portion of the HTML: <img runat="server" src="~/images/pc_blocks_navigation_spec1.gif" class="navigation_spec1" alt="" /> <div class="navigation_spec1_panel"> <p>filler <a href="#">test</a></p> </div> ... and the jQuery ... $('.navigation_spec1_panel').hide().css('opacity','0.0'); $('.navigation_spec1').hover(function() { $('.navigation_spec1_panel').animate({ width: '337px', height: '234px', opacity: 1.0 }, 1250 ); }, function() { $('.navigation_spec1_panel').animate({ width: '1px', height: '1px', opacity: 0.0 }, 1250); }); }); (Side comment: My animated <div> does not appear over / on top of other <div>s coded after this one in IE 6 or 7. The <div> appears behind them instead, regardless of z-index. Suggestions?)

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• Template specialization to use default type if class member typedef does not exist

  - by Frank

  Hi Everyone, I'm trying to write code that uses a member typedef of a template argument, but want to supply a default type if the template argument does not have that typedef. A simplified example I've tried is this: struct DefaultType { DefaultType() { printf("Default "); } }; struct NonDefaultType { NonDefaultType() { printf("NonDefault "); } }; struct A {}; struct B { typedef NonDefaultType Type; }; template<typename T, typename Enable = void> struct Get_Type { typedef DefaultType Type; }; template<typename T> struct Get_Type< T, typename T::Type > { typedef typename T::Type Type; }; int main() { Get_Type::Type test1; Get_Type::Type test2; } I would expect this to print "Default NonDefault", but instead it prints "Default Default". My expectation is that the second line in main() should match the specialized version of Get_Type, because B::Type exists. However, this does not happen. Can anyone explain what's going on here and how to fix it, or another way to accomplish the same goal? Thank you.

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• CouchDB- basic grouping question

  - by dnolen

  I have a user document which has a group field. This field is an array of group ids. I would like to write a view that returns (groupid as key) - (array of user docs as val). This mapping operation seems like a good beginning. function(doc) { var type = doc.type; var groups = doc.groups; if(type == "user" && groups.length > 0) { for(var i = 0; i < groups.length; i++) { emit(groups[i], doc); } } } But there's obviously something very wrong with my attempt at a reduce: function(key, values, rereduce) { var set = []; var seen = []; for(var i = 0; i < values.length; i++) { var _id = values[i]._id; if(seen.indexOf(_id) == -1) { seen.push(_id); set.push(values[i]); } } return set; } I'm running CouchDB 0.10dev. Any help appreciated.

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• Is there such a thing as a MemberExpression that handles a many-to-many relationship?

  - by Jaxidian

  We're trying to make it easy to write strongly-typed code in all areas of our system, so rather than setting var sortColumn = "FirstName" we'd like to say sortOption = (p => p.FirstName). This works great if the sortOption is of type Expression<Func<Person, object>> (we actually use generics in our code but that doesn't matter). However, we run into problems for many-to-many relationships because this notation breaks down. Consider this simple code: internal class Business { public IQueryable<Address> Addresses { get; set; } public string Name { get; set; } } internal class Address { public State MyState { get; set; } } internal class State { public string Abbreviation { get; set; } public int StateID { get; set; } } Is it possible to have this sort of MemberExpression to identify the StateID column off of a business? Again, the purpose of using this is not to return a StateID object, it's to just identify that property off of that entity (for sorting, filtering, and other purposes). It SEEMS to me that there should be some way to do this, even if it's not quite as pretty as foo = business.Addresses.SomeExtension(a => a.State.StateID);. Is this really possible? If more background is needed, take a look at this old question of mine. We've since updated the code significantly, but this should give you the general detailed idea of the context behind this question.

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• Cannot understand the behaviour of C# compiler while instantiating a class thru interface

  - by Newbie

  I have a class that implements an interface. The interface is public interface IRiskFactory { void StartService(); void StopService(); } The class that implements the interface is public class RiskFactoryService : IRiskFactory { } Now I have a console application and one window service. From the console application if I write the following code static void Main(string[] args) { IRiskFactory objIRiskFactory = new RiskFactoryService(); objIRiskFactory.StartService(); Console.ReadLine(); objIRiskFactory.StopService(); } It is working fine. However, when I mwrite the same piece of code in Window service public partial class RiskFactoryService : ServiceBase { IRiskFactory objIRiskFactory = null; public RiskFactoryService() { InitializeComponent(); objIRiskFactory = new RiskFactoryService(); <- ERROR } /// <summary> /// Starts the service /// </summary> /// <param name="args"></param> protected override void OnStart(string[] args) { objIRiskFactory.StartService(); } /// <summary> /// Stops the service /// </summary> protected override void OnStop() { objIRiskFactory.StopService(); } } It throws error: Cannot implicitly convert type 'RiskFactoryService' to 'IRiskFactory'. An explicit conversion exists (are you missing a cast?) When I type cast to the interface type, it started working objIRiskFactory = (IRiskFactory)new RiskFactoryService(); My question is why so?

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• C# how to get trailing spaces from the end of a varchar(513) field while exporting SQL table to a fl

  - by svon

  How do I get empty spaces from the end of a varchar(513) field while exporting data from SQL table to a flat file. I have a console application. Here is what I am using to export a SQL table having only one column of varchar(513) to a flat file. But I need to get all the 513 characters including spaces at the end. How do I change this code to incorporate that. Thanks { var destination = args[0]; var command = string.Format("Select * from {0}", Validator.Check(args[1])); var connectionstring = string.Format("Data Source={0}; Initial Catalog=dbname;Integrated Security=SSPI;", args[2]); var helper = new SqlHelper(command, CommandType.Text, connectionstring); using (StreamWriter writer = new StreamWriter(destination)) using (IDataReader reader = helper.ExecuteReader()) { while (reader.Read()) { Object[] values = new Object[reader.FieldCount]; int fieldCount = reader.GetValues(values); for (int i = 0; i < fieldCount; i++) writer.Write(values[i]); writer.WriteLine(); } writer.Close(); }

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• Rails Functional test assert_select javascript respond_to

  - by Macint

  Hello, I am currently trying to write functional tests for a charging form which gets loaded on to the page via AJAX(jQuery). It loads the form from the charge_form action which returns the consult_form.js.erb view. This all works, but I am having trouble with my testing. In the functional I can go to the action but I cannot use assert_select to find a an element and verify that the form is in fact there. Error: 1) Failure: test_should_create_new_consult(ConsultsControllerTest) [/test/functional/consults_controller_test.rb:8]: Expected at least 1 element matching "h4", found 0. <false> is not true. This is the view. consult_form.js.erb: <div id="charging_form"> <h4>Charging form</h4> <div class="left" id="charge_selection"> <%= select_tag("select_category", options_from_collection_for_select(@categories, :id, :name)) %><br/> ... consults_controller_test.rb: require 'test_helper' class ConsultsControllerTest < ActionController::TestCase def test_should_create_new_consult get_with_user :charge_form, :animal_id => animals(:one), :id => consults(:one), :format => 'js' assert_response :success assert_select 'h4', "Charging form" #can't find h4 end end Is there a problem with using assert_select with types other than html? Thank you for any help!

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• Define a positive number to be isolated if none of the digits in its square are in its cube [closed]

  - by proglaxmi

  Define a positive number to be isolated if none of the digits in its square are in its cube. For example 163 is n isolated number because 69*69 = 26569 and 69*69*69 = 4330747 and the square does not contain any of the digits 0, 3, 4 and 7 which are the digits used in the cube. On the other hand 162 is not an isolated number because 162*162=26244 and 162*162*162 = 4251528 and the digits 2 and 4 which appear in the square are also in the cube. Write a function named isIsolated that returns 1 if its argument is an isolated number, it returns 0 if its not an isolated number and it returns -1 if it cannot determine whether it is isolated or not (see the note below). The function signature is: int isIsolated(long n) Note that the type of the input parameter is long. The maximum positive number that can be represented as a long is 63 bits long. This allows us to test numbers up to 2,097,151 because the cube of 2,097,151 can be represented as a long. However, the cube of 2,097,152 requires more than 63 bits to represent it and hence cannot be computed without extra effort. Therefore, your function should test if n is larger than 2,097,151 and return -1 if it is. If n is less than 1 your function should also return -1. Hint: n % 10 is the rightmost digit of n, n = n/10 shifts the digits of n one place to the right. The first 10 isolated numbers are N n*n n*n*n 2 4 8 3 9 27 8 64 512 9 81 729 14 196 2744 24 576 13824 28 784 21952 34 1156 39304 58 3364 195112 63 3969 250047

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• Scientific Data processing (Graph comparison and interpretation)

  - by pinkynobrain

  Hi stackoverflow friends, I'm trying to write a program to automate one of my more boring and repetitive work tasks. I have some programming experience but none with processing or interpreting large volumes of data so I am seeking your advice (both suggestions of techniques to try and also things to read to learn more about doing this stuff). I have a piece of equipment that monitors an experiment by taking repeated samples and displays the readings on its screen as a graph. The input of experiment can be altered and one of these changes should produce a change in a section of the graph which I currently identify by eye and is what I'm looking for in the experiment. I want to automate it so that a computer looks at a set of results and spots the experiment input that causes the change. I can already extract the results from the machine. Currently they results for a run are in the form of an integer array with the index being the sample number and the corresponding value being the measurement. The overall shape of the graph will be similar for each experiment run. The change I'm looking for will be roughly the same and will occur in approximately the same place every time for the correct experiment input. Unfortunately there are a few gotchas that make this problem more difficult. There is some noise in the measuring process which mean there is some random variation in the measured values between different runs. Although the overall shape of the graph remains the same. The time the experiment takes varies slightly each run causing two effects. First, the a whole graph may be shifted slightly on the x axis relative to another run's graph. Second, individual features may appear slightly wider or narrower in different runs. In both these cases the variation isn't particularly large and you can assume that the only non random variation is caused by the correct input being found. Thank you for your time, Pinky

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• I just don't get the C++ Pointer/Reference system.

  - by gnm

  I've never had problems with references as in Python (implicit) or PHP (explicit &). In PHP you write $p = &$myvar; and you have $p as a reference pointing to $myVar. So I know in C++ you can do this: void setToSomething( int& var ) { var = 123; } int myInt; setToSomething( myInt ); Myint is now 123, why? Doesn't & mean "memory address of" x in C++? What do I do then if var is only the adress to myInt and not a pointer? void setToSomething( int* var ) { var* = 123; } int myInt; int* myIntPtr = &myInt; setToSomething( myIntPtr ); Does the above work as expected? I don't understand the difference between * and & in C++ fully. They tell you & is used to get the adress of a variable, but why IN GODS NAME does that help you in functions etc. like in the first example?

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• How should I solve this MySql problem (PHP) ? (Beginner)

  - by Camran

  I have several tables in a MySql database. I have a classifieds website, and at the bottom I display the users last visited classifieds. I do this by storing the ID:s of the ads to an array in the cookie. Now, my db is made up like this kindof: Main Table: // Stores global information, ie these fields have to be filled out in every record, never be blank ID Price category Seller Item Table: // Stores descriptive info about whats for sale ID AD_ID (FK) //This is the same as ID in the MAIN TABLE Color Size Mileage etc My problem is that I need to know what category the ad is in, in order to query mysql for the right information I think. So I need two variables, but the cookie only has one (ID) stored. Offcourse I could make two queries, first one just matching the ID to the main_table and fetch the category from the Main_table. Then make the second query and fetch all other info from the right table. Here is an example if the category was Vehicles: SELECT * FROM main_table, vehicles_table, WHERE main_table.id=$id_from_cookie AND main_table.ad_id=vehicles_table.ad_id As you can see above, I need the category to write in what table to check, right? But I think there must be a smarter way, like fetching them in one single query using only one variable (id from cookie)? How should I do this? Understand? Let me know if you need more input... Thanks

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• Download Canvas Image Png Chome/Safari

  - by user2639176

  Works in Firefox, and won't work in Safari, or Chrome. function loadimage() { var canvas = document.getElementById("canvas"); if (window.XMLHttpRequest) {// code for IE7+, Firefox, Chrome, Opera, Safari xmlhttp=new XMLHttpRequest(); xmlhttp2=new XMLHttpRequest(); } else {// code for IE6, IE5 xmlhttp=new ActiveXObject("Microsoft.XMLHTTP"); xmlhttp2=new ActiveXObject("Microsoft.XMLHTTP"); } xmlhttp.onreadystatechange=function() { if (xmlhttp.readyState==4 && xmlhttp.status==200) { rasterizeHTML.drawHTML(xmlhttp.responseText, canvas); var t=setTimeout(function(){copy()},3000) } } xmlhttp.open("GET","/sm/<?=$sm[0];?>",true); xmlhttp.send(); } function copy() { var canvas = document.getElementById("canvas"); var img = canvas.toDataURL("image/png"); document.getElementById('dl').href = img; document.getElementById('dl').innerHTML = "Download"; } Now I didn't write this, so I don't know too much javascript. But the script works in Firefox. In Chrome, getting: Uncaught Security Error: An attempt was made to break through the security policy of the user-agent. For toDataURL("image/png")

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• When to use () with classes?

  - by SoulBeaver

  This is really starting to confuse the hell out of me. When do I use them, when don't I? For example I was reading a .cpp on linked lists whose class declaration was: struct CarPart { long PartNumber; char Partname[40]; double UnitPrice; CarPart *next; }; class ListOfParts { int size; public: CarPart *head; ListOfParts(); ~ListOfParts(); const int count() const; void insert( CarPart *item ); CarPart *retrieve( int pos ); }; With this code, why am I allowed to write ListOfParts *pPart = new ListOfParts(); CarPart *pCarPart = new CarPart; Declaring an instance of ListOfParts requires (), but not my CarPart? That's confusing me. When I asked a question before and people told me that such a declaration is a function that returns a ListOfParts object, but not the actual constructor. So I'm guessing this is still something different. What's happening here? PS: Am I correct to assume that the const to the right of count() means I cannot modify any values in count?

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• when will come the new C++ standard? C++0x

  - by Oops

  Hi, when will the new C++ standard became official? C++ was standardized in 1998 and the standard is called C++98 the C++ standard was updated in 2003 and is called C++03 so the unofficial name "C++0x" lead us to the wrong conclusion that it will come within the first decade of the 20th century. Have u also mentioned that we all make the year 2000 bug again? Now we have 2010 so if you take the X as the latin sign for 10 it should come out this year. But no, also this would be wrong. The answer: The name of the language was always part of the language itself. As we all know the ++ operator means: one more But we have learned in some situations it would be better to write ++C so the other way around often is better. and what does the characters 0x mean in the C++ language? Right it's the prefix for a hexadecimal number. Now the question is easy to answer, it's meaning is: 0x++C int main(){ std::cout << "When will the new C++ standard come out? " << std::endl; int x0_ = 0x7D0, _0x = x0_, C = 0xC, Y1 = C+++_0x, Y2 = x0_+++C; std::cout << "it will be standardized between the Years: " << Y1 << " and " << Y2 << std::endl; char c; std::cin >> c; return 0; } do you agree? regards Oops

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• Java vs. C variant for desktop and tablet development

  - by MirroredFate

  I am going to write a desktop application, but I am conflicted concerning which language to use. It (the desktop application) will need to have a good GUI, and to be extendable (hopefully good with modules of some sort). It must be completely cross-platform, including executable in various tablet environments. I put this as a requirement while realizing that some modification will no doubt be necessary. The language should also have some form of networking tools available. I have read http://introcs.cs.princeton.edu/java/faq/c2java.html and understand the differences between Java and C very well. I am looking not necessarily at C, but more at a C variant. If it is a complete toss-up, I will use Java as I know Java much better. However, I do not want to use a language that will be inferior for the task I wish to accomplish. Thank you for all suggestions and explanations. NOTE: If this is not the correct stack for this question, I apologize. It seemed appropriate according to the rules.

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• Patterns to deal with with functions that can have different kinds of results.

  - by KaptajnKold

  Suppose you have an method on an object that given the some input alters the objects state if the input validates according to some complex logic. Now suppose that when the input doesn't validate, it can be due to several different things, each of which we would like to be able to deal with in different ways. I'm sure many of you are thinking: That's what exceptions are for! I've thought of this also. But my reservation against using exceptions is that in some cases there is nothing exceptional about the input not validating and I really would like to avoid using exceptions to control what is really just in the expected flow of the program. If there were only one interpretation possible, I could simply choose to return a boolean value indicating whether or not the operation resulted in a state change or not and the respond appropriately when it did not. There is of course also the option to return a status code which the client can then choose to interpret or not. I don't like this much either because there is nothing semantic about status codes. The solution I have so far is to always check for each possible situation which I am able to handle before I call the method which then returns a boolean to inform the client if the object changed state. This leaves me the flexibility to handle as few or as many as the possible situations as I wish depending on the context I am in. It also has the benefit of making the method I am calling simpler to write. The drawback is that there is quite a lot of duplication in the client code wherever I call the method. Which of these solutions do you prefer and why? What other patterns do people use for providing meaningful feedback from functions? I know that some languages support multiple return values, and I if I had that option I would surely prefer it.

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• C++ Template Classes and Copy Construction

  - by themoondothshine

  Is there any way I can construct an new object from the given object if the template parameters of both objects are identical at run-time? For example: I have a template class with the declaration: template<typename _Type1, typename _Type2> class Object; Next, I have two instantiations of the template: template class Object<char, int>; template class Object<wchar_t, wint_t>; Now, I want to write a member function such as: template<typename _Type1, typename _Type2> Object<char, int> Object<_Type1, _Type2>::toCharObject() { if(__gnu_cxx::__are_same<_Type1, char>::__value) return *this; else { //Perform some kind of conversion and return an Object<char, int> } } I have tried a couple of techniques, such as using __gnu_cxx::__enable_if<__gnu_cxx::__are_same<_Type1, char>::__value, _Type1>::__type in a copy constructor for the Oject class, but I keep running into the error: error: conversion from ‘Object<wchar_t, wint_t>’ to non-scalar type ‘Object<char, int>’ requested Is there no way I can do this? Any help will be greatly appreciated!

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• multiple mysql_real_query() in while loop

  - by Steve

  It seems that when I have one mysql_real_query() function in a continuous while loop, the query will get executed OK. However, if multiple mysql_real_query() are inside the while loop, one right after the other. Depending on the query, sometimes neither the first query nor second query will execute properly. This seems like a threading issue to me. I'm wondering if the mysql c api has a way of dealing with this? Does anyone know how to deal with this? mysql_free_result() doesn't work since I am not even storing the results. //keep polling as long as stop character '-' is not read while(szRxChar != '-') { // Check if a read is outstanding if (HasOverlappedIoCompleted(&ovRead)) { // Issue a serial port read if (!ReadFile(hSerial,&szRxChar,1, &dwBytesRead,&ovRead)) { DWORD dwErr = GetLastError(); if (dwErr!=ERROR_IO_PENDING) return dwErr; } } // Wait 5 seconds for serial input if (!(HasOverlappedIoCompleted(&ovRead))) { WaitForSingleObject(hReadEvent,RESET_TIME); } // Check if serial input has arrived if (GetOverlappedResult(hSerial,&ovRead, &dwBytesRead,FALSE)) { // Wait for the write GetOverlappedResult(hSerial,&ovWrite, &dwBytesWritten,TRUE); //load tagBuffer with byte stream tagBuffer[i] = szRxChar; i++; tagBuffer[i] = 0; //char arrays are \0 terminated //run query with tagBuffer if( strlen(tagBuffer)==PACKET_LENGTH ) { sprintf(query,"insert into scan (rfidnum) values ('"); strcat(query, tagBuffer); strcat(query, "')"); mysql_real_query(&mysql,query,(unsigned int)strlen(query)); i=0; } mysql_real_query(&mysql,"insert into scan (rfidnum) values ('2nd query')",(unsigned int)strlen("insert into scan (rfid) values ('2nd query')")); mysql_free_result(res); } }

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• how to create following Java applicatin? [on hold]

  - by Tushar Bichwe

  Write a JAVA program which performs the following listed operations: A. Create a package named MyEmpPackage which consists of following classes A class named Employee which stores information like the Emp number, first name, middle name, last name, address, designation and salary. The class should also contain appropriate get and set methods. 05 A class named AddEmployeeFrame which displays a frame consisting of appropriate controls to enter the details of a Employee and store these details in the Employee class object. The frame should also have three buttons with the caption as “Add Record” and “Delete Record” and “Exit”. 10 A class named MyCustomListener which should work as a user – defined event listener to handle required events as mentioned in following points. 05 B When the “Add Record” button is clicked, the dialog box should be appeared with asking the user “Do you really want to add record in the file”. If the user selects Yes than the record should be saved in the file. 10 When the “Exit” button is clicked, the frame should be closed. 10 [Note: Use the MyCustomListener class only to handle the appropriate events] C The “Delete Record” button should open a new frame which should take input of delete criteria using a radio button. The radio button should provide facility to delete on basis of first name, middle name or last name. 10 The new frame should also have a text box to input the delete criteria value. 10 The record should be deleted from the file and a message dialog should appear with the message that “Record is successfully Deleted”. 10 [Note: Use the MyCustomListener class only to handle the appropriate events] D Provide proper error messages and perform appropriate exceptions where ever required in all the classes 10

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• compile error:c language in telnet(linux)

  - by lilyrose07

  #include<stdio.h> #include<unistd.h> #include<stdlib.h> #include<pthread.h> int count=0; void *thread_function(void *arg) { while(count<10) { if(count%2==1) { count++; } else {sleep(1);} } } int main(int argc,int *argv) { int res; pthread_t a_thread[2]; void *thread_result; int n; while(count<10) { if(count%2==0) {printf("%d",count); count++; } else{sleep(1);} } for(n=0;n<2;n++) { pthread_create(&(a_thread[n]),NULL,thread_function,NULL); } while(count==9) {pthread_join(a_thread[0],&thread_result); } while(count==10) { pthread_join(a_thread[1],&thread_result); } printf("%d",count); return 0; } in telnet,linux i write gcc za.c error list: undefined reference to pthread_create,pthread_join in function 'main' //why??

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