Easy to Learn Java: Programming Articles, Examples and Tips

Start with Java in a few days with Java Lessons or Lectures

Home

Code Examples

Java Tools

More Java Tools!

Java Forum

All Java Tips

Books

Submit News
Search the site here...
Search...
 
Search the JavaFAQ.nu
1000 Java Tips ebook

1000 Java Tips - Click here for the high resolution copy!1000 Java Tips - Click here for the high resolution copy!

Java Screensaver, take it here

Free "1000 Java Tips" eBook is here! It is huge collection of big and small Java programming articles and tips. Please take your copy here.

Take your copy of free "Java Technology Screensaver"!.

I just started with Java and found very strange that in simple operation like

JavaFAQ Home » Daily Tips Go to all tips in Daily Tips


Bookmark and Share

Question: I just started with Java and found very strange that in simple operation like:

float a = 31.335f;
float b = 12.2362f;
float result = a + b
gives
43.571200000000005 not 43.5712
Why?

Even more:
if I do simple operation
d = a + b;
d = d - b;
it will not give exactly the value of "a":
31.335 not equal to 31.334997?

Answer:
The reason is that computers usually use counting based on base 2, not 10 and if we use float variables then they often can not be exactly converted to binary number.
For doubles it is the same.
The result depends on particular case. Same numbers can be exactly converted. Not all. You should keep in mind that.

***************************************
Our older tips: March 22, 2001 - October 21, 2002 read here.
All published and not published on site tips you can find here


 Printer Friendly Page  Printer Friendly Page
 Send to a Friend  Send to a Friend

.. Bookmark and Share

Search here again if you need more info!
Custom Search



Home Code Examples Java Forum All Java Tips Books Submit News, Code... Search... Offshore Software Tech Doodling

RSS feed Java FAQ RSS feed Java FAQ News     

    RSS feed Java Forums RSS feed Java Forums

All logos and trademarks in this site are property of their respective owner. The comments are property of their posters, all the rest 1999-2006 by Java FAQs Daily Tips.

Interactive software released under GNU GPL, Code Credits, Privacy Policy