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Dividing 2 double values

3 replies on 1 page. Most recent reply: Nov 1, 2003 6:05 PM by Senthoorkumaran Punniamoorthy

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patoots

Posts: 6
Nickname: patoots
Registered: Oct, 2003

Dividing 2 double values Posted: Oct 30, 2003 10:42 PM
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Hi! I'd like to know the reason behind the behavior of double when dividing 1 value over the other (both of double datatype)

double number1 = 100000.00;
double number2 = 50505.05;

double result = number2 / number1;

based on the above calculation, i ought to expect a result of 0.5050505 but the answer appeared to be 0.5050505000000001. How did this come to be?!?!?


Madhav Bhargava

Posts: 2
Nickname: utopians
Registered: Oct, 2003

Re: Dividing 2 double values Posted: Oct 31, 2003 1:54 PM
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Non repeating decimals in base 10 can be repeating in base 2. This might be the reason why u do not get what u expect..

Jonathon Brozny

Posts: 24
Nickname: jonathon
Registered: Oct, 2003

Re: Dividing 2 double values Posted: Nov 1, 2003 10:10 AM
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doubles are not accurate. Even subtracting with them sometimes will give similar results. If you want something that will give you the expected answer all the time check out something like BigDecimal.

http://java.sun.com/j2se/1.4.2/docs/api/java/math/BigDecimal.html

Senthoorkumaran Punniamoorthy

Posts: 335
Nickname: senthoor
Registered: Mar, 2002

Re: Dividing 2 double values Posted: Nov 1, 2003 6:05 PM
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BigDecimal is right way to go I guess but if you think BigDecimal is too heavy for your work you can use integers. You got to convert both numbers to integers before calculation and then convert them back to double.

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