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What types of conditions can be used for conditional compilation in C++?

- by user1002288

This is an exam question for C++: Which of the following statements accurately describe the condition that can be used for conditional compilation in C++? A. The condition can depend on the value of environment variables. B. The condition can depend on the value of any const variables. C. The condition can depend on the value of program variables. D. The condition can use the sizeof() operator to make decision about compiler-dependent operations based on the size of standard data type. E. The condition must evaluate to either a 0 or 1 during preprocessing. I think the answer is E. Is this correct?

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encode data in get request

- by user902395

<!DOCTYPE html> <html> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <body onload="searchForPrograms.submit();"> <form id="searchForPrograms" name="searchForPrograms" enctype="application/x-www-form-urlencoded" method="get" action="searchingEngine.php"> <input type="text" id="query" name="query" value="MyProgram" /><br> <input type="submit" value="Search" /> </form> </body> The get request should have the form like "searchingEngine.php?query=%22MyProgram%22". How can I encode the value of the query input correctly?

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Function to set an auth_token

- by john mossel

In my form I have a hidden field: <input type="hidden" name="auth_token" value="<?php echo $auth_token; ?>"> This value is also stored in a session and a variable: $_SESSION['auth_token'] = hash('sha256', rand() . time() . $_SERVER['HTTP_USER_AGENT']); # TODO: put this in a function $auth_token = $_SESSION['auth_token']; When the form is submitted the two values are compared. It's a basic form token. Should this be made into two functions or just one when refactored? set_form_token() and get_form_token(), get_form_token() returning the session value, then I can compare it in my main code. What is the proper way of doing this?

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HTML/Javascript disabled and then reenabled checkbox is being POSTED

- by NeverStopLearning

I have a page with a checkbox that is disabled/reenabled with javascript on button click. If I never disable the checkbox then its value is correctly POSTed, however if I disable the checkbox even once it gets posted without value (posts as "name=" even when checked). I have inspected the POST value through firebug. Why does it behaves like this? Am I missing something? I ve read somewhere that disabled controls are not posted, thats OK, but this control is not disabled when the submit is clicked. I am using ASP.NET with more complex setup to test this, but essentially this is the core of the problem. The brower is FF latest. I found very similar question, however without an answer: disabled control being reenabled but still not posting back contents to server

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jquery loop and compare values

- by lgt

Is it possible to use jqueries each loop in this form to dissolve hyperlinks? $(document).ready(function() { var toExclude =['http://www.google.com', 'http://example']; $.each(toExclude, function(key, value) { $("a[href='+value+']").replaceWith(function(){ var url=value; var matches = url.match(/^https?\:\/\/([^\/?#]+)(?:[\/?#]|$)/i); var domain = matches && matches[1]; return domain; }); }); });

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Preserving NULL values in a Double Variable

- by Sam

Hi, I'm working on a vb.net application which imports from an Excel spreadsheet. If rdr.HasRows Then Do While rdr.Read() If rdr.GetValue(0).Equals(System.DBNull.Value) Then Return Nothing Else Return rdr.GetValue(0) End If Loop Else I was using string value to store the double values and when preparing the database statement I'd use this code: If (LastDayAverage = Nothing) Then command.Parameters.AddWithValue("@WF_LAST_DAY_TAG", System.DBNull.Value) Else command.Parameters.AddWithValue("@WF_LAST_DAY_TAG", Convert.ToDecimal(LastDayAverage)) End If I now have some data with quite a few decimal places and the data was put into the string variable in scientific notation, so this seems to be the wrong approach. It didn't seem right using the string variable to begin with. If I use a double or decimal type variable, the blank excel values come across as 0.0. How can I preserve the blank values? Thanks

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jQuery .get()/.post() doesn't send an updated cookie

- by Markus

Hello, I'am doing something like this: function setCookie(name, value, expire) { var exdate = new Date(); exdate.setDate(exdate.getDate()+expire); document.cookie=name+ "=" +escape(value)+((expire==null) ? "" : ";expires="+exdate.toGMTString()); } // When I click a button // Update the cookie setCookie("test", "1"); function getContent() { // Get the data of our new URL $.get("index.php", loadContent); } function loadContent(data) { // alert the new title // the PHP script is changing title after what cookie-value you have alert($("title", data).text()) } First of all, when Iam alerting it is still the last showing up. So I guess it doesn't send the changed cookies at all.. And for some reason I don't see the request in my Live HTTP Headers window... But also, if i request the URL(without the ajax) it works just fine What am I doing wrong here? Regards Markus

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Override decimal ToString() method

- by Jimbo

I have a decimal datatype with a precision of (18, 8) in my database and even if its value is simply 14.765 it will still get displayed as 14.76500000 when I use Response.Write to return its value into a webpage. Is it possible to override its default ToString method to return the number in the format #,###,##0.######## so that it only displays relevant decimal places? UPDATE I'm assuming that when one outputs number on a page like <%= item.price %> (where item.price is a number) that the number's ToString method is being called? I'm trying to avoid having to change every instance where the value is displayed by defaulting the ToString() format somehow.

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Property hiding and reflection (C#)

- by tehMick

Declaring a property in a derived class that matches the name of a property in the base class "hides" it (unless it overrides it with the override keyword). Both the base and derived class properties will be returned by Type.GetProperties() if their types don't match. However, if their types do match, shockingly only the derived class's property is returned. For instance: class A { protected double p; public int P { get { return (int)p; } set { p = value; } } } class B : A { public new int P { get { return (int)p; } set { p = value; } } } class C : B { public new float P { get { return (float)p; } set { p = value; } } } Calling typeof(C).GetProperties() will only return B.P and C.P. Is it possible to call GetProperties() in a way that returns all three? There is almost certainly a way to do it by traversing the inheritance hierarchy, but is there a cleaner solution?

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detailsView title and description stays the same, not refreshing ...

- by ahmet732

I have some values on my tableview coming from database. I simply tap one of them, navigate to detailsView then I can see the title and description of that value on my navigation controller. (title on navigation bar, description on text view in detailsView) but when I wanted to search, I click search bar, keyboard comes up from the bottom, tableview minimizes a bit then find what I want from table. I tap again but titles and descriptions show very first value of my table view .. It does not show the correct title and description. Whenever I searched, it shows the title and description of very first value on my table view..

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Flattening hash into string in Ruby

- by fahadsadah

Is there a way to flatten a hash into a string, with optional delimiters between keys and values, and key/value pairs? For example, print {:a => :b, :c => :d}.flatten('=','&') should print a=b&c=d I wrote some code to do this, but I was wondering if there was a neater way: class Hash def flatten(keyvaldelimiter, entrydelimiter) string = "" self.each do |key, value| key = "#{entrydelimiter}#{key}" if string != "" #nasty hack string += "#{key}#{keyvaldelimiter}#{value}" end return string end end print {:a => :b, :c => :d}.flatten('=','&') #=> 'c=d&a=b' Thanks

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Best way to support large dropdowns

- by JustAProgrammer

Say I have a report that can be restricted by specifying some value in a dropdown. This dropdown list references a table with 30,000 records. I don't think this would be feasible to populate a dropdown with! So, what is the best way to provide the user the ability to select a value given this situation? These values do not really have categories and even if I subdivided (by having some nesting dropdown situation) by the first letter of the value, that may still leave a few thousand entries. What's the best way to deal with this?

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PHP strtotime() setting date to default

- by Paddyd

I have a script which is reading values from an excel sheet and inserting them into an sql table. My problem is when the script reads in some of the date fields it is setting them to a default value : 1970-01-01 01:00:00 I have noticed that this is happening when it comes across a date where the 'day' is greater than 12 : 13/05/2012 18:52:33 (dd-mm-yyyy hh-mm-ss) I thought this may be due to the script thinking that this is the month field (i.e american format) and it sees it as an invalid value, so I set the default timezone to my own hoping it may resolve the problem but it made no difference. date_default_timezone_set('Europe/Dublin'); Here is an example of what my code is doing: Excel field value : 01/05/2012 18:32:45 Script: $start_time = $data->val($x,5); echo $start_time = date("Y-m-d H:i:s", strtotime($start_time)); Output: 2012-01-05 18:32:45 This is the exact format I am looking for (except for the fact that the day and month fields are switched around i.e american date format) but it doesnt work for the type of dates I mentioned above.

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how to append dropdown list box

- by kumar

$("#Grid").click( $("#showgrid").load('SomeURL')); $.each($('#Grid td:nth-child(4n)'), function() { var forthColumn = $(this); forthColumn.append("<select><option value='1'>Division 1</option><option value='2'>Division 2</option><option value='3'>Division 3</option></select>"); }); }; I am trying to append the dropdown list box? this way but I am not seeing the dropdownbox at 4th colum? is this right? thanks for all..

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Using jquery to disable function untill all selects are changed

- by richbyte

I am using a javascript function (F) (jquery )which uses 3 select values selected by the user to calculates a value - R(result) R is a number ranging from (1 through 9), (11) and (22); I need 2 extra steps one before the calculation and one after. a. Before calculation takes place: Make sure all three select values are changed before function(F) takes place. If not prompt the user with a notice ( create dom element/ I am using jquery) b. After the value R is calculated show an element corresponding to the result e.g. if R is 1 show an element ( a predetermined "link" element corresponding to each result value) thanks a lot.

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How is this relation in 4th normal form? Is the dependency trivial?

- by squ

I have a question that concerns multi value dependency. The relation looks like this: R(A,B) with A -->> B (A multi value determines B) I've been told that this relation is in 4th normal form, but I don't really se how. I know that if the multi value dependency is trivial, then it doesn't violate the 4th normal form. But is this trivial? It would be trivial if it, for example, looked like this: {A,B} -->> B But the first dependency example shouldn't be trivial. The other rule for 4th NF says that A in this case needs to be a super key of the relation, but it isn't. As far as I can tell, A isn't a super key, since {A,B} is needed to identify a tuple. So the question is, why is this in 4th normal form? It seems to be violating both of the rules.

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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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PHP OOP problem

- by Isis

Hello <?php class Templater { var $params = array(); public static function assign($name, $value) { $this->params[] = array($name => $value); } public static dunction draw() { return $this->params; } } <?php $test = Templater::assign('key', 'value')->draw(); print_r($test); I need to function "assign" was static, but $params was common for the whole class.. BUt this code is not working(( Fatal error: Using $this when not in object context Any ideas?

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what's wrong with this code..

- by rockers

$('#PbtnSubmit').click(function() { if ($("#PricingEditExceptions input:checkbox:checked").length > 0) { var chec = $('#PricingEditExceptions input[type=checkbox]:checked'); var strIDs = chec.map(function() { return $(this).val(); }).get().join(","); alert(PMstrIDs); $('#1_exceptiontypes').attr('value', exceptiontypes) $('#1_PMstrIDs').attr('value', PMstrIDs); } else { alert("please select atleast one exception"); return false; } }); var checked = $('#PricingEditExceptions input[type=checkbox]:checked'); this code returns correct value in Firefox but not in IE8.. is that something need to change? why I am not getting all the checked checkboxes in IE8? please can anybody help me out? thanks

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PHP fb error posting story to user wall

- by user237925

I got an error from last 6 hrs. and stuck on it.While running my code i got this error again and again "Request failed with code: 400, message: {"error":{"message":"(#100) Object Invalid Value: Object at URL 'http://stayingnear.com/index.php?r=apartment\u00252Fview&id=1' of type 'stayingnearapp:apartment' is invalid because the given value '7.2853779052137E+14' for property 'fb:app_id' could not be parsed as type 'fbid'.","type":"OAuthException","code":100}}" is it the access token problem or what,and how can i handle this problem ?

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Small questions on data structure

- by John Graveston

Hi, I'm trying to search the parent of a node with Kruskal's algorithm. My program works just fine, but I think I have heard of a method to improve the speed of the algorithm by reconstructing the tree while searching for the parent node and connecting it to the parent node. I'm pretty sure that I've heard of this somewhere, maybe in a lecture. Can anyone refresh my memory? And also, given a number of arrays, when searching for the minimum and the maximum value from a certain section of an array, what is the name of the tree that can calculate the minimum/maximum value from the array by making a binary tree that has the minimum/maximum value of each array in O(log N)?

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Need help... how to add md5 to password field in php?

- by jones

Hi mates, i looking some help and nice attention here.. i bought some php script many years ago and now no suport anymore... i just want to add md5 to password field.. here my form: <?php $SQL = "SELECT * from USERS WHERE USERNAME = '$_SESSION[username]'"; $result = @mysql_query( $SQL ); $row = @mysql_fetch_array( $result ); include 'menu.php'; ?> <FORM METHOD="post" ACTION="?page=query_client"> <INPUT TYPE="hidden" NAME="controller" VALUE="USERS~update~account_details&up=1~<?php echo $row[ID]; ?>"> <TABLE CLASS="basictable"> <TR> <TD CLASS="tdmenu" WIDTH="40%">Username</TD> <TD CLASS="tdmenu" WIDTH="60%"> <b><?php echo $row[USERNAME]; ?></b> </TD> </TR> <TR> <TD CLASS="tdmenu" WIDTH="40%">Password *</TD> <TD CLASS="tdmenu" WIDTH="60%"> <INPUT TYPE="PASSWORD" NAME="PASSWORD" SIZE="40" VALUE="<?php echo $row[PASSWORD]; ?>"> </TD> </TR> <TR> <TD CLASS="tdmenu" WIDTH="40%">Email Address *</TD> <TD CLASS="tdmenu" WIDTH="60%"> <INPUT TYPE="text" NAME="EMAIL" SIZE="40" VALUE="<?php echo $row[EMAIL]; ?>"> </TD> </TR> <TR> <TD CLASS="tdmenu" WIDTH="40%">Full Name *</TD> <TD CLASS="tdmenu" WIDTH="60%"> <INPUT TYPE="text" NAME="FULLNAME" SIZE="40" VALUE="<?php echo $row[FULLNAME]; ?>"> </TD> <TR> <TD CLASS="tdmenu" WIDTH="40%">Address *</TD> <TD CLASS="tdmenu" WIDTH="60%"> <INPUT TYPE="text" NAME="ADDRESS1" SIZE="40" VALUE="<?php echo $row[ADDRESS1]; ?>"> </TD> </TR> <BR> <TABLE CLASS="basictable"> <TR> <TD CLASS="tdhead2" > <DIV ALIGN="CENTER"><B> <INPUT TYPE="submit" NAME="Submit" VALUE="Submit"> </B></DIV> </TD> </TR> </TABLE> </FORM> and the it self as query_client.php inside look like: <?PHP @session_start(); $controller = $_POST['controller']; $pieces = explode("~", $controller); $table = $pieces[0]; $qt = $pieces[1]; $return = $pieces[2]; $id = $pieces[3]; $hack = $pieces[4]; if ($qt == insert) $qt = 'INSERT INTO'; if ($qt == update) { $qt = 'UPDATE'; $end = "WHERE ID = '$id'"; } $pre = array_keys( $_POST ); mysql_query ("CREATE TABLE IF NOT EXISTS `$table` (`ID` INT NOT NULL AUTO_INCREMENT , PRIMARY KEY ( `id` ) )"); $count = count($pre); $count = $count - 2; $sql = "$qt $table SET"; for ($i=0; $i < $count; $i++) { $x=$i+1; $y = $_POST[$pre[$x]]; $d = $y; mysql_query ("ALTER TABLE `$table` ADD `$pre[$x]` TEXT NOT NULL"); $sql .= " `$pre[$x]` = '$d',"; } $sql .= " ID = '$id' $end"; $query = mysql_query($sql) or die("$sql_error" . mysql_error()); if (empty($hack)) { } else { $pieces = explode("/", $hack); $h0 = $pieces[0]; $h1 = $pieces[1]; $h2 = $pieces[2]; $h3 = $pieces[3]; $h4 = $pieces[4]; $h5 = $pieces[5]; mysql_query ("ALTER TABLE `$table` $h0 $h1 $h2 $h3 $h4 $h5"); $query = mysql_query($sql) or die("$sql_error" . mysql_error()); } if (isset($_GET[inc])) include "$_GET[inc].php"; ?> so please help me how to add md5 in PASSWORD field? thanks in advance..

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jquery ajax calls with scope safety

- by acidzombie24

My gut tells me that if i am on a laggy server and the user fires two events fast enough on the success function c will be the value of the most recent event causing func1 to use the wrong value. <--- This is a guess, i haven't proved it. Its a feeling. How do i ensure that i use the right value when calling func1? I prefer not to send c to the server and i dont know if or how to serialize the data and deserialize it back. How do i make this code safe? $('.blah').click(function (event) { var c = $(this).closest('.comment'); ... $.ajax({ url: "/u", type: "POST", dataType: "json", data: { ... }, success: function (data) { func1(c. data.blah);//here

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Lua : How to check if one of the values associated with the specified key of a table is nil, from ap

- by felace

In lua, it's legal to do this : table={} bar if(table[key]==nil) foo However, using C API, I couldn't find way to check if there's a nil value on the specified position. lua_getglobal(L,"table"); lua_gettable(L,key); If there's a nil value stored in table[key], lua_gettable would give me the "unprotected error in call to Lua API (attempt to index a nil value)" message. Is there any way to check if there's actually something associated with that key, before actually pushing the key to do so ?

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how can i send jquery ajax http request with php

- by testkhan

i have following form... <form action="http://mydomain.com/get.php" method="post"> <input type="hidden" value="thisisvalue" name="hdnvalue"> <input type="text" name="cost" id="cost"><br><br> <textarea id="msg" name="message"></textarea><br><br> <input type="submit" value="Send" id="send"> </form> the get.php file will response in 1 or 0 i.e 1 means recieved and 0 means not recieved now i want to send it to http://mydomain.com/get.php via http request with jquery ajax how can i do that get the returned value..

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