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• C++, strange behavior reusing variable name

  - by aaa

  hello. I have following snippet: { double scale = 3; // not used? { double scale = 4*scale; // what is RHS scale? for (...) { // scale is 0 here, using g++ } } } moreover, g++ reports first scale is not used. how is second scale initialize? What should be correct behavior? thanks

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• "...redeclared as different kind of symbol"?

  - by CodeNewb

  #include <stdio.h> #include <math.h> double integrateF(double low, double high) { double low = 0; double high = 20; double delta_x=0; double x, ans; double s = 1/2*exp((-x*x)/2); for(x=low;x<=high;x++) delta_x = x+delta_x; ans = delta_x*s; return ans; } It says that low and high are "redeclared as different type of symbol" and I don't know what that means. Basically, all I'm doing here (READ: trying) is integrating from low (which I set to 0) to high (20) to find the Riemann sum. The for loop looks kinda trippy too...I'm so lost.

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• jQuery syntax for changing the value of a table cell

  - by cf_PhillipSenn

  I have a table where every row has a unique id. The last table cell has class="status" where I want to show the user the result of their action. In my $.ajax call, I have: ,success: function(result){ $('tr#'+result).td('.status').text('Updated'); }; result is the id of the row that was updated. It's just throwing an error message that says $( and that's all.

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• Javascript syntax for abbreviating repeated access to same identifier

  - by yongjieli

  Hi all I wanted to ask if there is a formal way of describing the following code, whereby we can access the same object repeatedly without re-typing the object's identifier: myObj.render(1).render(2).print(); I didn't know how to describe it when trying to form a question; I wanted to know whether or not something like this is possible in javascript, I know that I can do it in VB: myObj.render(1) if(foo == 'bar') .render(2) .print(); Thanks!

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• SQL Syntax for multiple conditions in the same field

  - by Jonathan

  I can't seem to find this in the mysql manual: How do you enter multiple conditions for the same field in a select statement? e.g.: SELECT * FROM table WHERE ID = '1, 2, 3, 4' Is there a way to do this without using this: SELECT * FROM table WHERE ID = '1' OR ID = '2' OR ID = '3' OR ID = '4'

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• NHibernate BusinessRules

  - by mr0zek

  I need implement business using nhibernate ORM I have two entites Project (Id,Name,Effort) Task (Id,Name,Effort) I need update Effort in Project when Effort in Task changes. How to do it ? I have planed to use event system build in nhibernate but still don't know how to access to Project entity within Task Event

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• What is this : in php?

  - by Tom

  What this symbol : mean in php?

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• Why cant i use the field user in SQL Server 8?

  - by acidzombie24

  Maybe not literally but the query below gets an error near user. If i change it to userZ it works. WHY can i not use that name? Is there a way to specific its a field instead of a keyword? (or whatever it is) create table Post2 ( id INTEGER PRIMARY KEY NOT NULL, title nvarchar(max) NOT NULL, body nvarchar(max) NOT NULL, user integer REFERENCES Post1(id));

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• Why Python language does not have a writeln() method?

  - by systempuntoout

  If we need to write a new line to a file we have to code: file_output.write('Fooo line \n') Are there any reasons why Python not has a writeln() method?

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• jQuery extend $.fn and calling method syntax

  - by MBax

  I understand that you call a method like this when you are extending $.fn. ( $ == jQuery ) //$("div").myMethod(); $.fn.extend({ myMethod: function(){...} }); And like this when you extend the jQuery Object: //$.myMethod2(); $.extend({ myMethod2: function(){...} }); But I don't quite understand what the $() is doing here: $().functionName({ something: 'something' }).myMethod(); Does it have to do with the fact the method is being called including the function name? Thanks in advance and hope this makes sense.

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• why does twitter use the !function syntax in their embed code

  - by samccone

  I was looking at twitters embed code and saw that they are using !function ... while i know that this evaluates to false I was wondering what the point of it was. thoughts? !function(d,s,id){var js,fjs=d.getElementsByTagName(s)[0];if(!d.getElementById(id)){js=d.createElement(s);js.id=id;js.src="//platform.twitter.com/widgets.js";fjs.parentNode.insertBefore(js,fjs);}}(document,"script","twitter-wjs");

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• l+l++ is the same as l+l ?

  - by httpinterpret

  Say,the trailing ++ has no actual effect here?

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• What does @@variable mean in Ruby?

  - by Andrew

  What are Ruby variables preceded with double at signs (@@)? My understanding of a variable preceded with an at sign is that it is an instance variable, like this in PHP: PHP version class Person { public $name; public function setName($name) { $this->name = $name; } public function getName() { return $this->name; } } Ruby equivalent class Person def set_name(name) @name = name end def get_name() @name end end What does the double at sign @@ mean, and how does it differ from a single at sign?

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• Why python does not have a writeln() method?

  - by systempuntoout

  If we need to write a new line to a file we have to code: file_output.write('Fooo line \n') Are there any reasons why Python not has a writeln() method?

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• C++ delete syntax

  - by source.rar

  Hi, I came across this rather unusual usage of 'delete'. Just wanted to know if the following line deletes both pointers or only the first? delete ptr1, ptr2

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• What's the difference between {} and [] in MATLAB?

  - by Runner

  >> A={1 2;2 3} A = [1] [2] [2] [3] >> A=[1 2;2 3] A = 1 2 2 3 It seems to me they are essentially the same thing?

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• Alternative to the syntax "MyClass.class.getName()"

  - by Mocha

  Is there any other way of expressing this in Java? MyClass.class.getName()

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• What does \x mean in c/c++?

  - by user198729

  char arr[]= "\xeb\x2a"; BTW,are these the same: "\xeb\x2a" vs '\xeb\x2a'

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• Why using namespace std is necessary here?

  - by symfony

  #include <iostream> using namespace std; int main() { cout << "!!!Hello World!!!" << endl; // prints !!!Hello World!!! return 0; } If I remove the 2nd statement,the build will fail. Why is it necessary?

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• What is the role of the data types inside of < > in Java? [closed]

  - by Emanuil

  Possible Duplicate: Java Generics To be more specific, whats the role of the <String> in the following line of code? private List<String> item = new ArrayList<String>();

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• A question about ; in PHP

  - by user198729

  exit() is valid,but exit() echo 1; Will fail. Why?

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• Is there any difference between [1 2] and [1 ,2] in MATLAB?

  - by user198729

  >> [1 2] ans = 1 2 >> [1 ,2] ans = 1 2 >> It looks the same,is that true?

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• jQuery: correct syntax for ':not()'

  - by user304299

  I'm trying to filter a list of elements via ':not()', and jQuery seems to be ignoring my filter. here is the code: myElements.filter(':not(.someclass)'); jquery still selects all of myElements...

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• Jquery ajax() error : "Uncaught Syntax error, unrecognized expression: %2Cacpitool%2Caide"

  - by Crupuk

  Hello, I have a error when i tried to send post data with ajax() method. I have a array with : - acpitool - aide I use encodeURIComponent() for passing the array with data: but the ajax method fail.. Could you help me ? (Sorry for basic english.. ) Thanks

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• Regular Expressions Quick Reference

  - by Jan Goyvaerts

  The Regular-Expressions.info website has a new quick reference to regular expressions that lists all of the regex syntax in one single table along with a link to the tutorial section that explains the syntax. The quick reference is ordered by syntax whereas the full reference tables are ordered by feature. There are multiple entries for some of the syntax as different regex flavors may use the same syntax for different features. Use the quick reference if you’ve seen some syntax in somebody else’s regex and you have no idea what feature that syntax is for. Use the full reference tables if you already know the feature you want but forgot which syntax to use. Of course, an even quicker reference is to paste your regex into RegexBuddy, select the application you’re working with, and click on the part of the regex you don’t understand. RegexBuddy then selects the corresponding node in its regex tree which summarizes exactly what the syntax you clicked on does in your regex. If you need more information, press F1 or click the Explain Token button to open the relevant page in the regex tutorial in RegexBuddy’s help file.

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