Reason:
Because internally, computers use a format (binary floating-point) that cannot accurately represent a number like 0.1, 0.2 or 0.3 at all.

When the code is compiled or interpreted, your “0.1” is already rounded to the nearest number in that format,
which results in a small rounding error even before the calculation happens.

The solution for this problem is rounding it after the add action.

<script type="text/javascript">

  function roundNumber(number, digits) {
      var multiple = Math.pow(10, digits);
      var rndedNum = Math.round(number * multiple) / multiple;
      return rndedNum;
  }

 function printFloat(){
	  var myFloatNumber1 = document.getElementById('floatNumber1');
	  var myFloatNumber2 = document.getElementById('floatNumber2');
	  alert(roundNumber(parseFloat(myFloatNumber1.value)+ parseFloat(myFloatNumber2.value),2))
 }

</script>

<input type="text" id="floatNumber1"></input>
<input type="text" id="floatNumber2"></input>

<input type="button" onclick="printFloat()"/>

If you want to read more about this topic or why it happens, you can visit these sites:
JavaScript: The Good Parts: Appendix A – Awful Parts (page 105)
decimal arithmetic
Wikipedia article on floating point numbers

or you could just use StackOverflow like any other selfrespecting developer and ask it to the community
Is the math broken?
My question on stackoverflow

Scrum Guide

This is for all you PHP hating dudes! Big thank you goes to the Emergent Collective One!
Lee Fernandes, creator of the song said this:

I like thick beats, and I struggle with lyrics, but can do something nice from time to time. Some of the style I learned in music production translated to application development, a general willingness to try new approaches. And the pragmatism of development cycles came back to my music production workflow, so I bang em out dutifully.

Check for song nr 4, play it and listen to the lyrics, it’s awesome.

The whole album of Emergent Collective One is free to download at http://fracturedvisionmedia.com/FVM005/

Be sure to listen to all other songs on the album too, they really aren’t that bad at all!!!

You can remove this problem by simply extending the session lifetime to the desired number of seconds. By default it is set to 1440 seconds, 24 minutes and that might give you the above result once in a while. So extend the session lifetime to, for example 10800 seconds (3 hours),in the php.ini as followed:

; After this number of seconds, stored data will be seen as 'garbage' and
; cleaned up by the garbage collection process.
session.gc_maxlifetime = 1440

to

; After this number of seconds, stored data will be seen as 'garbage' and
; cleaned up by the garbage collection process.
session.gc_maxlifetime = 10800

don’t forget to restart your local wamp/lamp…

But I think it might come in quite useful someday.

Here’s a description of the project file of an eclipse project:

http://help.eclipse.org/ganymede/index.jsp?topic=/org.eclipse.platform.doc.isv/reference/misc/project_description_file.html

and here is my code on the php project:

<?xml version="1.0" encoding="UTF-8"?>
<projectDescription>
	<name>ProjectName</name>
	<comment></comment>
	<projects>
	</projects>
  <buildSpec>
    <buildCommand>
      <name>org.eclipse.wst.validation.validationbuilder</name>
      <arguments>
      </arguments>
    </buildCommand>
    <buildCommand>
      <name>org.eclipse.dltk.core.scriptbuilder</name>
      <arguments>
      </arguments>
    </buildCommand>
  </buildSpec>
  <natures>
    <nature>org.eclipse.php.core.PHPNature</nature>
  </natures>
</projectDescription>

My start screen looked something like this, on which we can see the older version and obviously it’s time to upgrade.

Go to the download page and download the latest version you prefer. As my whole environment is set in English I just select the phpMyAdmin-3.3.4-english.7z version.

Second step is to extract the downloaded files to your local location and set the rights as you prefer. This can be done in different ways but I prefer the manual way, this is done by copying the config.sample.inc.php, renaming it to config.inc.php and change the preferences in the file as you prefer.

In my case the only two lines that had to be changed where:

$cfg['Servers'][$i]['controluser'] = 'root';
$cfg['Servers'][$i]['controlpass'] = 'blabla';

If you need more information, it can be found in the documentation included in the package (documentation.txt).

If we go to the location on our local host now (in my case http://localhost/phpMyAdmin/) we get an error saying that we don’t have permissions to view this page.

In order to get this working we need to set the phpmyadmin.conf file and adapt it, the alias and directory need to be adapted to the freshly installed version.

Alias /phpmyadmin "C:\wamp\apps\phpMyAdmin-3.3.4-english"

# to give access to phpmyadmin from outside
# replace the lines
#
#        Order Deny,Allow
#	Deny from all
#	Allow from 127.0.0.1
#
# by
#
#        Order Allow,Deny
#   Allow from all
#

<Directory "C:\wamp\apps\phpMyAdmin-3.3.4-english/">
    Options Indexes FollowSymLinks MultiViews
    AllowOverride all
        Order Deny,Allow
	Deny from all
	Allow from 127.0.0.1
</Directory>

After restarting your local wamp, you’ll get the correct and new version of phpMyAdmin in your browser.

Have fun.

I believe that this is happening indeed, the only question is: When will robots take all possible issues and influences into account that only can be done by human common sense?
That and the enormous amount of data that has to be processed will be the biggest issues to solve in the future.
The amount of data of what is happening with us and around us increases on a daily basis and basic sensors won’t be sufficient…

I’m really curious where this is all heading. Following Moore’s law, doubling everything in the next 2 years, I will outlive all these inventions

That is off course, if I stop drinking those loads of coffee…

Every designer and project manager should take a look at this video, superb.

The ‘on it’ joke is one to remember, even the best make mistakes, roflmao!