• Post Reply Bookmark Topic Watch Topic
  • New Topic
programming forums Java Mobile Certification Databases Caching Books Engineering Micro Controllers OS Languages Paradigms IDEs Build Tools Frameworks Application Servers Open Source This Site Careers Other Pie Elite all forums
this forum made possible by our volunteer staff, including ...
Marshals:
  • Campbell Ritchie
  • Jeanne Boyarsky
  • Ron McLeod
  • Paul Clapham
  • Liutauras Vilda
Sheriffs:
  • paul wheaton
  • Rob Spoor
  • Devaka Cooray
Saloon Keepers:
  • Stephan van Hulst
  • Tim Holloway
  • Carey Brown
  • Frits Walraven
  • Tim Moores
Bartenders:
  • Mikalai Zaikin

double decimal problems

 
Greenhorn
Posts: 13
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Try follow coding. Guess what's the output?
int size = 55;
double total = 0.0;
for (int i = 0; i < size; i++) {
total += 0.1 + i;
}
System.out.println("Total is : " + total);
The answer is "Total is : 1490.4999999999995"
Any ideas about fixing the problem except using BigDecimal?
 
"The Hood"
Posts: 8521
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
I have to assume that the problem is the rounding issue. doubles and floats both have decimals. In order to be precise with decimals you would need to have an infinite number of decimal places (of course impossible) therefore they are ALWAYS not quite exact.
BigDecimal is probably your best bet.
 
Cindy Glass
"The Hood"
Posts: 8521
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Hey, I JUST saw this article in JavaWorld
http://www.javaworld.com/javaworld/jw-06-2001/jw-0601-cents.html
So I thought that I would share it with you. How timely.
 
Well THAT's new! Comfort me, reliable tiny ad:
a bit of art, as a gift, the permaculture playing cards
https://gardener-gift.com
reply
    Bookmark Topic Watch Topic
  • New Topic