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• Does malloc(0) return a valid pointer or NULL?

  - by Jaspreet

  Hi Malloc() is used for dyamic memory allocation and returns a pointer (void*) to the memory allocated. What happens if i pass zero in malloc as an argument. Does a valid memory allocation takes place? Explain

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• GCC compile time division error

  - by kartikmohta

  Can someone explain this behaviour? test.c: #include <stdio.h> int main(void) { printf("%d, %d\n", (int) (300.6000/0.05000), (int) (300.65000/0.05000)); printf("%f, %f\n", (300.6000/0.05000), (300.65000/0.05000)); return 0; } $ gcc test.c $ ./a.out 6012, 6012 6012.000000, 6013.000000 I checked the assembly code and it puts both the arguments of the first printf as 6012, so it seems to be a compile time bug.

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• Dictionary to Json object, "Expected expression"

  - by MrW

  I'm trying to convert a dictionery into a json object, so that I can work with it in my front end. sortFields = <%= SchrodersHtmlHelper.ToJson(ViewData["SortInfo"])%>; However, I keep on getting "Expected expression" for this all the time and I'm clueless why. Could anyone explain to me what I'm doing wrong? Edit: The conversion works fine, but I still get this issue in the front end, causing the browser to complain about it.

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• Random RAM usage amounts

  - by DTown

  I was hoping someone could explain why my application when loaded uses varying amounts of RAM. I'm speaking about a compiled version that uses the exe directly. It's a pretty basic applications and there are no conditional branches in the startup of the application. Yet every time I start it up the RAM amount varies from 6MB-16MB. I know it's on the small end of usage anyways but I'm curious of why this happens.

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• Enterprise Library logging into database is very slow

  - by Sergej Andrejev

  I'm using enterprise library for logging web page events. Because page is load balanced I have to store logs in database on different server (requirement). Sadly, I found storing around 20 entries per page request is very slow (adds additional ~10s). Can anybody explain why this happens and how to fix it. P.S. I'm using default pooling settings in logging database connection string.

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• ActiveRecord :has_many associations and === operator

  - by Jakub

  Can someone explain me this Ruby on Rails puzzle? class Post < ActiveRecord::Base has_many :comments end Post.first.comments.class => Array Array === Post.first.comments => false Array === [ 1 ] => true

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• (Why) does Tomcat/Java perform better on Linux than on Windows?

  - by ripper234

  I just read this (one) study in which Tomcat under Linux outperformed Windows. From your experience, is this generally true? Any deep reason that could explain the performance difference?

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• Microsoft .NET security model

  - by Thomas

  Hi all, I am looking for informations about the security model of Microsoft .NET If you could explain me how it is design, or give me links to understand it, it would be very kind of you ! Thanks.

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• UIButton as a subview in UILable

  - by Jayshree

  hi. i am trying to dynamically add a UIbutton as a subview to UIlable. but i am not able to click the button. it seems that the lable doesnt allow the buttonTapped event to occur. can somebody explain what exactly is happening here. and can anybody give me an alternative for this. thnx

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• Python references

  - by hekevintran

  Can someone explain why the example with integers results in different values for x and y and the example with the list results in x and y being the same object? x = 42 y = x x = x + 1 print x # 43 print y # 42 x = [ 1, 2, 3 ] y = x x[0] = 4 print x # [4, 2, 3] print y # [4, 2, 3] x is y # True

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• parseInt('07')=='7', but parseInt('08')=='0'? why?

  - by KOHb

  Here's a simple script that gives a strange result: alert(parseInt('01')+' - '+parseInt('02')+' - '+parseInt('03')+' - '+parseInt('04')+' - '+parseInt('05')+' - '+parseInt('06')+' - '+parseInt('07')+' - '+parseInt('08')+' - '+parseInt('09')+' - '+parseInt('10')); I would expect it to give 1 - 2 - 3 and so on, but it gives me this (in FireFox, Chrome and IE6): 1 - 2 - 3 - 4 - 5 - 6 - 7 - 0 - 0 - 10 Can someone please explain me why?

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• pgSQL query error

  - by running4surival

  i tried using this query: "SELECT * FROM guests WHERE event_id=".$id." GROUP BY member_id;" and I'm getting this error: ERROR: column "guests.id" must appear in the GROUP BY clause or be used in an aggregate function can anyone explain how i can work around this?

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• Will this only allow certain extensions?

  - by Dr Hydralisk

  I found this snippet that says will only allow certain file types. Will it work and could someone bypass it to upload what ever file type they want? And could someone explain the substr part, i don't get how it works.. <?php function CheckExt($filename, $ext) { $name = strtolower($filename); if(substr($name, strlen($name) -3, 3) == $ext) return true; else return false; } ?>

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• Does putting Java source files into a JAR increase the JVM's RAM consummed ?

  - by thecoder

  If not, why not always include sources file into "open source" JAR distributions ? (thanks in advance if you have some official weblinks that explain your answers)

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• What does "program to interfaces, not implementations" mean?

  - by ajsie

  One stumbles upon this phrase when reading about design patterns. But I don't understand it, could someone explain this for me?

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• How to list available instances of SQL Servers using SMO in C#?

  - by Cute

  Hi Can anybody explain me what I wrong I am doing in the following piece of code: DataTable dt=SmoApplication.EnumAvailableSqlServer(true); Server sr = new Server("Test"); foreach(DataBase db in sr.DataBases) { Console.WriteLine(db["name"]); } It gives an exception in sr.Databases that can not be connected.

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• Which eclipse files belong under Version Control

  - by sblundy

  Which eclipse files is it appropriate to put under source control, aside from the sources obviously. In my project, specifically, I'm wondering about: .metadata/* project-dir/.project project-dir/.classpath project-dir/.settings/* If there are any of these for which is depends, please explain your guidelines.

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• database assignment

  - by eric

  Hi, Given the following table: CREATE TABLE T1 (A INTEGER NOT NULL); CREATE TABLE T3 (A SMALLINT NOT NULL); INSERT T1 VALUES (32768.5); SELECT * FROM T1; INSERT T3 SELECT * FROM T1; SELECT * FROM T3; What is the output of above query? If any error occured please declare the line of it?Explain your answer!

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• carry flag and subtraction issue!

  - by Zia ur Rahman

  If a large number is subtracted from a smaller number then borrow is needed. The carry flag plays the role of borrow during the subtraction operation. Now suppose we want to subtract 56 from 66, obviously the borrow is needed and carry flag will be set. Now how this subtraction is performed to get the result -10, how computer will distinguish that the result is going to be a negative number. Please explain the process.

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• is it possible in javascript to create shortcuts with sequence like 123,345 instead of combo?

  - by frankB

  I already used some script to implement the shortcuts in my web page but i was wondering if could be possible to associate some combination not syncronic like Ctrl+X but more like a sequence typing 1..2..3 or any other combination to execute a script... lets assume this example: you have a long list with numbers: you could type 3..5...6, so you can go to the item 356 passing trough the item 3 then 35 then 356 more or less like when you type while selecting a select box i hope it was clear, id not easy to explain...

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• Where to use Inner Class in professional java developement life?

  - by abc

  Where to use Inner Class in professional java developement life? Please explain.. googling didn't wrk efficiently..

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• Hibernate reverse engineering

  - by EugeneP

  I have a structure where the main table is USER, other tables include CATEGORY (contains user_id). What I got after the standard reverse engineering procedure was: the class User contained a collection of categories, the class Category didn't contain the foreign key (user_id) but it did contain the User object. Why did it not contain the foreign key as a class property? And how do I join these two tables in HQL without that glue? HQL - please explain this part.

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• GC generation 3 appearing in windbg

  - by Johnv2020

  I've a dump file of a process I'm running (trying to find a memory leak) One thing I've noticed is that when I dump the bigger objects via !do windbg tells me that they are GC generation 3 ?? All of these are byte arrays so when I look at all the byte arrays in the dump I can see GC generations 0, 1, 2 & 3. Could someone explain whats going on here as I thought there was only 3 generations of GC.

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• difference between scope and namespace of ruby-on-rails 3 routing

  - by fayer

  i cant understand what the difference is between a namespace and a scope in the routing of ruby-on-rails 3. could someone please explain? namespace "admin" do resources :posts, :comments end scope :module => "admin" do resources :posts, :comments end thanks

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• Why should I pass Boolean as a parameter instead of "boolean"?

  - by ferrari fan

  Hi, A co-worker asked me to change a signature from using a primitive "boolean" to using a classed "Boolean". He didn't offer a very good explanation why? Have any of you heard of this and can any of you explain why it matters or doesn't matter? Edit: He mentioned that it was good practice for public methods.

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