This may or may not be the answer:
From the JavaDocs for *java.text.DecimalFormat* which I assume it would
use, it says it uses "DecimalFormat uses halfeven rounding (see
ROUND_HALF_EVEN <cid:part1.07040809.03030807@kumachan.net.nz>) for
formatting."
ROUND_HALF_EVEN: "Rounding mode to round towards the "nearest neighbor"
unless both neighbors are equidistant, in which case, round towards the
even neighbor. Behaves as for ROUND_HALF_UP if the digit to the left of
the discarded fraction is odd; behaves as for ROUND_HALF_DOWN if it's
even. Note that this is the rounding mode that minimizes cumulative
error when applied repeatedly over a sequence of calculations."
First line, 0.375, number to left of 5 is 7 = odd, so it rounds up to 0.38
Second line, 5.565, number to left of 5 is 6 = even, so it rounds down
Third line, 5.5651, number to left of 1 is 5 = odd, rounds up to 6,
giving 5.566, then uses 'nearest neighbour' rounding on the last 6 to
give 5.57
I don't know if there is any way to use a different rounding technique
using the <fmt:formatNumber> tag.
Bartley, Chris  NASHCCON wrote:
>Hi,
>
>I'm noticing some (rather frustrating) inconsistencies with how
><fmt:formatNumber> performs rounding of decimals. I've attached a couple
>files that illustrate the problem, but, in a nutshell, these three tags:
>
> <fmt:formatNumber type="currency" value="0.375"/>
> <fmt:formatNumber type="currency" value="5.565"/>
> <fmt:formatNumber type="currency" value="5.5651"/>
>
>result in:
>
> $0.38
> $5.56
> $5.57
>
>The first and third are what I expect, but the second value ($5.56) is
>really throwing me. Why isn't it $5.57? Am I doing something wrong or is
>there some other sorta magic I can use to get the rounding to work properly?
>
>I'm using Standard Taglib version 1.0.4, JDK 1.3.1_07, Weblogic 7, and Win2k
>sp4.
>
>thanks heaps!
>
>Chris
>
>
>
>
>
>
>
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Jason Lea

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