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BigDecimal SetScale()  How?

Posted on 2000-04-13
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Last Modified: 2012-06-27
I am using BigDecimal format and when I say:

BigDecimal nCurrentNumber = new
BigDecimal ("9");
BigDecimal nTemp = new
BigDecimal ("5");


nCurrentNumber = nCurrentNumber.divide(nTemp, BigDecimal.ROUND_HALF_UP);

nCurrentNumber.setScale(28,BigDecimal.ROUND_UP);

I get a result of 2, but I am expecting
1.8  I doesn't actually give me any decimal point - why?  all operations return a number with no decimal places.

Can someone help me - urgent

Thanks
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Question by:gbzhhu
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4 Comments
 
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Expert Comment

by:jerch
ID: 2714922
Hi gbzhhu...
Just change

nCurrentNumber.divide(nTemp, BigDecimal.ROUND_HALF_UP);

to
int scale = 2;
nCurrentNumber = nCurrentNumber.divide(nTemp, 2, BigDecimal.ROUND_UP);

This will produce 1.80.

The scale is the number of digits to the right of the decimal point. Of course it depends on what precision you want.

best regards...
Jerson

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Accepted Solution

by:
jerch earned 400 total points
ID: 2714939
By the way, same logic goes with the setScale() method...

e.g.
        BigDecimal nCurrentNumber2  = new BigDecimal ("7.52434");
        System.out.println(nCurrentNumber2.setScale(1, BigDecimal.ROUND_HALF_UP));

Take note that the setScale doesn't actually modify the value of the BigDecimal object you're calling from instead it returns a new BigDecimal.

Jerson
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Author Comment

by:gbzhhu
ID: 2718000
Superp answer jerch

Thanks
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LVL 4

Expert Comment

by:jerch
ID: 2718155
you're welcome :)
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