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• Question about Null vs zero

  - by Mike

  I have this function: void ToUpper(char * S) { while (*S!=0) { *S=(*S >= 'a' && *S <= 'z')?(*S-'a'+'A'):*S; S++; } } What does it mean for *S != 0, should it be null instead?

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• What is the rationale for difference between -> and . in c++ ?

  - by Good Person

  I know the difference between the member operator (.) and the member by pointer operator (-). Why did the c++ designers create a different operator for this access? Why can't the compiler figure it out on its own? If you always used a . does any case exist where it is ambiguous whether you mean a member or a member by pointer?

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• safely reading directory contents

  - by Jack

  Is it safe to read directory entries via readdir() or scandir() while files are being created/deleted in this directory? Should I prefer one over the other? When I say "safe" I mean entries returned by these functions are valid and can be operated without crushing the program. Thanks.

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• Is there something better / faster / cooler than Open GL?

  - by mystify

  Do the really really really really really really really big games (I mean the REALLY big ones, that cost billions to develop) also use Open GL? Or are there some proprietary technologies out there, which can scare Open GL's pants off?

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• Is the next C standard actively developed?

  - by wwwww

  Is there currently a group working on the next C standard (by next, I mean after C99)? If so, what are the features likely to make it in?

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• what exactly is delegate in C#

  - by Learning.net

  Hi All, can somebody explain the use of delegate..I know that it is used to invoke methods at run time...but exactly what does it mean..can somebody explain it with some simple example, which will help a newcomer to understand delegate better

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• Check mysql_query results if DELETE query worked?

  - by Camran

  I have a DELETE query which deletes a record from a mysql db. is there any way to make sure if the delete was performed or not? I mean, for a query to FIND stuff you do $res=mysql_query($var); $nr=mysql_num_rows($res); and you get nr of rows returned. Is there any similiar method for deletion of records? Thanks

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• Validate links with php

  - by mike

  Can anyone tell me if its possible to validate a link with php? By validate, I mean check if the link is active and works not just the actual format of the link.

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• from string to integer (scripts)

  - by lego69

  I have this snippet of the code: set calls = `cut -d" " -f2 ${2} | grep -c "$numbers"` set messages = `cut -d" " -f2 ${3} | grep -c "$numbers"` @ popularity = (calls * 3) + messages and error @ expression syntax what does it mean? grep -c returns number, am I wrong, thanks in advance in $numbers I have list of numbers, 2 and 3 parameters also contain numbers

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• Controlling form elements from a different thread in Windows Mobile

  - by d1k_is

  Trying to get a thread to change form controls in Windows Mobile. Throws an unsupported exception. Does this mean it cant be done at all? If not, how do I go about this? Forms are created in the Parent/Main thread then a thread is created to do some work in the background but I want to make it so the Background thread can update the form to show its completed...

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• Data structure in C# (3.0) that represents a CUBE

  - by Thinking

  Can you please give me some idea about how to design a data structure in C# (3.0) which will give a representation of 3D data structure. I mean to say something similar to cube. Like stock data to be viewed based on time , location . Kindly give a simple working example or even a link will do. It's urgent. Any example will be appreciated. Thanks in advance

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• how i can make a sort system depend on Character

  - by moustafa

  i mean i have songs table ok?? i want to make some things like that a | b | c | d click on a select from the database the songs that start by a Character how i can do that by the mysql???

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• Increment and Decrement operators

  - by viswanathan

  How are the below valid and invalid as shown and what do they mean. When would such a situation arise to write this piece of code. ++x = 5; // legal --x = 5; // legal x++ = 5; // illegal x-- = 5; // illegal

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• What is the rationale for difference between -> and . in c/c++ ?

  - by Good Person

  I know the difference between the member operator (.) and the member by pointer operator (-). Why did the C designers create a different operator for this access? Why can't the compiler figure it out on its own? If you always used a . does any case exist where it is ambiguous whether you mean a member or a member by pointer?

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• Rails: it's a good ideia to store the view in a global var?

  - by Totty

  Im thinking of storing the view, what i mean by view is like this: app/views/profiles/index.html.haml into this i would do $view = self then in other parts of my app i would use and edit the $view var. it might get troubles?

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• What is 'type' in systypes?

  - by cruzy

  In sys.systypes ... what exactly is 'type'? What exactly does .... bigint int varchar ... order mean when I execute select * from sys.systypes order by type desc

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• Dependency Properties

  - by developer

  Hi All, Can anybody explain me what a dependency property is in WPF and what is its use. I know there are a lot of tutorials on google for it, but they teach how to create a dependency property. I am confused as to where I would use it. I mean will I use it in XAML? If anybody could explain me in simple terms, that would be great.

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• Oracle/SQL table attribute question

  - by UnceRawr

  I have been given a context schema for a database i need to make for my coursework but some of the attributes (column names) contain letters in brackets at the end of them such as: *x_Number (Adm) *x_Number (A) *x_Number (P) The problem is i have no idea what these letters mean! Can anyone help?

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• PHP: array('function' => 'theme_select_as_checkboxes')

  - by Patrick

  hi, what does this construct mean in PHP ? It is storing a variable called "function" with his String value in an array ? array('function' => 'theme_select_as_checkboxes') thanks

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• purpose of enumeration?

  - by I__

  can someone please give me some examples where enumeration is used? i dont understand the concept. i mean both IEnumerable and enum?

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• problem in DataTextFied

  - by ZiGi

  i know that the syntax for usin DataTextField is : VA.DataTextField = "nameofcolum" but if my request is not simple that mean my request return the result in a colum wich not exist in this case what i should to affect to DataTextField

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• What happens if we load already loaded class again?

  - by GK

  I mean we have a class which is already loaded in JVM. and in some other method we are unknowingly trying to load that same class, So in this situation what happens? ie will there be any error or exception saying its already loaded. If not, then is it possible that we can have modified class with some extra features and load it whenever it is required that is Hot Deployment.

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• Creating a good search solution

  - by Daniel

  I have an app where users have a role,a username,faculty and so on.When I'm looking for a list of users by their role or faculty or anything they have in common I can call (among others possible) @users = User.find_by_role(params[:role]) #or @users = User.find_by_shift(params[:shift]) So it keeps the system Class.find_by_property So the question is: What if at different points users lists should be generated based on different properties.I mean: I'm passing from different links params[:role] or params[:faculty] or params[:department] to my list action in my users controller.As I see it all has to be in that action,but which parameter should the search be made by?

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• Meaning of int(0) in int *pi = new int(0); ?

  - by understack

  int *pi = new int(0); What's the significance of 0 here? Does it mean integer array of length 0?

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• Windows XP maximum memory - reduced by graphics card memory? [closed]

  - by John C

  I've seen occasional references that claimed a graphics card's video memory was part of Windows XP's memory address space - is that true? If you have 4GB on an XP system, and add a 1GB graphics card, does that mean Windows only has 3GB for programs?

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