Win a copy of Micro Frontends in Action this week in the Server-Side JavaScript and NodeJS forum!
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 all forums
this forum made possible by our volunteer staff, including ...
Marshals:
• Campbell Ritchie
• Ron McLeod
• Paul Clapham
• Bear Bibeault
• Junilu Lacar
Sheriffs:
• Jeanne Boyarsky
• Tim Cooke
• Henry Wong
Saloon Keepers:
• Tim Moores
• Stephan van Hulst
• Tim Holloway
• salvin francis
• Frits Walraven
Bartenders:
• Scott Selikoff
• Piet Souris
• Carey Brown

# BigDecimal

Greenhorn
Posts: 10
I have to retain the exact value of a Double and convert it into a string.

Double value = 105312453566.35363465;

I tried doing a toString() on the above Double value... but it returns me an output 1.0531245356635364E11

Hence I tried converting it into a BigDecimal format using the below code... so that I can retain the exact value..

BigDecimal newValue = new BigDecimal(value);
System.out.println("BigDecimal Value: " + newValue);

But the output which I get is like this :

BigDecimal Value: 105312453566.3536376953125

which is again not what I want.

How can I get the exact value?

Rancher
Posts: 43016
76
That number has 20 digits, and doubles simply do not have that much accuracy. Around 16 digits is the most number of accurate digits that's possible. See #20 in the http://faq.javaranch.com/java/JavaBeginnersFaq for some background information.

The solution to your problem is to use the BigDecimal(String) constructor. It retains all digits of its parameter.

Ranch Hand
Posts: 95
I agree with Ulf.
An another approach is to multiply the double value for a number (like 1000) that makes the double an int.

Ulf Dittmer
Rancher
Posts: 43016
76
An int has even less precision than a double (around 10 digits), and a long has around 19, so neither of those would work in this case.

 Did you see how Paul cut 87% off of his electric heat bill with 82 watts of micro heaters?