alexrazon

DotNet Division Bug?

alexrazon — Wed, 15 Jul 2009 05:13:00 GMT

Here's an interesting exercise for the day.

In Visual Studio 2005/2008,

1. Create a new Console Application.

2. Put in the following code in Main:

double x = 5.15;
double y = x / 100;
Console.WriteLine("y = " + y);

3. Put a breakpoint at the Console.Writeline(..).

4. Press F5 to debug the application.

5. Watch the value of y. What is its value in the watch window?

6. Press F10 to continue with the console write. What is the value of y as displayed?

Do the same for x=4.15, x=6.15,x=7.15,x=8.15.... What are the values displayed?

Try also to divide by 10 or 1000 using the same set of values for x. (E.g. 4.15/10, 6.15/1000). What is the resulting value for y?

Using pen and paper, what are the supposed results? :)

Hint: It appears that there are extra values for the results using x=5.15, x=6.15, and x=7.15. Weird eh?

Free .Net Obfuscator

Alexis' Blog — Wed, 09 Apr 2008 03:24:32 GMT

I've stumbled upon a free .Net obfuscator --Eazfuscator.NET. So far, it works well for my purposes. Most obfuscators are costly--ranging from $200 to $2000! But this one is freeware and it works better than the free one bundled with Visual Studio...(read more)

Printing PDF Using WebBrowser Control in .Net 2.0

Alexis' Blog — Tue, 08 Apr 2008 10:18:46 GMT

Okay, after almost a year and an offshore assignment, I finally had a chance to update this blog. I was developing a .Net 2.0 C# windows application wherein I basically have to print PDF files from a Windows application. I tried to use the Adobe Acrobat...(read more)

WCF

Alexis' Blog — Fri, 27 Jul 2007 11:23:19 GMT

This week I had a Windows Communications Foundation training from Developmentor , sponsored by our company. I learned a lot about the new framework (dotnet 3.0) and communications. What interested me the most was the Day 4 topic which was Peer-to-peer...(read more)

Re: Do JavaScript after window.close()

Alexis' Blog — Tue, 06 Feb 2007 05:22:01 GMT

There is a slight modification for my previous post . The conditions for the if statement there is inadequate. The bug occurs when refreshing the browser when the mouse is beyond the leftmost side of the window, a valid yet unanticipated negative value...(read more)

Re: JavaScript Hashtable Implementation

Alexis' Blog — Tue, 06 Feb 2007 05:03:52 GMT

This is in response to my previous post re JavaScript Hashtable Implementation . I modified my code to be able to remove elements, as well as get an enumeration of the elements in cases wherein the keys are strings rather than integers. Here are the new...(read more)

IIS 5.1: 403.9 - Access Forbidden: Too many users are connected

Alexis' Blog — Thu, 11 Jan 2007 23:35:45 GMT

I found this blog that addresses my concern in IIS 5.1 for Windows XP. I recently discovered that it is crippled in such a way that it only allows 10 concurrent connections. Moreover, it is hardcoded to be configured to at most 40. If the maximum concurrent...(read more)

Do JavaScript after window.close()

Alexis' Blog — Tue, 09 Jan 2007 07:59:43 GMT

I needed to do some routines when a user has closed the window. I do not want those routines to trigger when refreshing the page or unloading the document; I just need them to happen when the browser window is closed. This is the usual proposed solution...(read more)

BLOCKED SCRIPT How to close the browser window without the IE warning

Alexis' Blog — Mon, 08 Jan 2007 23:49:48 GMT

In Internet Explorer, when you use window.close() in JavaScript to close the current browser window, you will be asked something like "A script is attempting to close this window. Do you want to continue?" As a programmer, this can be annoying...(read more)

Access Control Lists

Alexis' Blog — Thu, 14 Dec 2006 09:19:07 GMT

Ever had Windows XP crash? And worse comes to worse you had to reformat your PC and you need to back up your data? The BIG problem is: you can't access your folders! Well, here's a workaround I've gathered around the net (that is yet to be...(read more)

ArrayList sorting via IComparable

Alexis' Blog — Mon, 27 Nov 2006 12:13:57 GMT

The problem: I have a two-dimensional object array. Each first level element of the array contains five object elements--except for the last one, which only has three. However, I have a procedure that needs to concatenate another array at the end of the...(read more)

Predicates in dotNet

Alexis' Blog — Sun, 19 Nov 2006 22:20:17 GMT

I've come across Predicates in dotNet 2.0. I felt so disgusted with too many foreach loops when looping through list collections. So, here was my problem: I have three string Lists, say, A, B and C. List string A is the reference list; while B and...(read more)

Get the volume serial number of a drive

Alexis' Blog — Wed, 15 Nov 2006 20:42:16 GMT

This code returns the volume serial for a hard drive (VB6). Code Public Declare Function GetVolumeSerialNumber Lib "kernel32" Alias "GetVolumeInformationA" (ByVal lpRootPathName As String, ByVal lpVolumeNameBuffer As Long, ByVal nVolumeNameSize...(read more)

Re: Introducing .NET Framework 3.0

Alexis' Blog — Wed, 15 Nov 2006 20:41:07 GMT

It is officially released. The Microsoft .NET Framework 3.0 is the new managed code programming model for Windows®. It combines the power of the .NET Framework version 2.0 with new technologies for building applications that have visually compelling user...(read more)

Office 2007

Alexis' Blog — Wed, 15 Nov 2006 20:40:38 GMT

The recent Office 2007 RTM presents a bug when opening buildingblocks.dotx. The solution for this is to delete the file and let Office recreate it. It can be located in: %drive%:\Documents and Settings\%username%\Application Data\Microsoft\Document Building...(read more)