# Re: BigDecimal Exception

From:
=?ISO-8859-1?Q?Arne_Vajh=F8j?= <arne@vajhoej.dk>
Newsgroups:
comp.lang.java.programmer
Date:
Fri, 26 Nov 2010 20:44:03 -0500
Message-ID:
<4cf0625e\$0\$23752\$14726298@news.sunsite.dk>
On 26-11-2010 20:40, inspired wrote:

Based on advice provided on an earlier post, I am trying to use the
BigDecimal class. However, I`m having a fundamental problem.

In my application class, I have the following:

private static final BigDecimal LSBvalue = (new BigDecimal (180 *
( Math.pow(2, 1 - 15)))).setScale(5, RoundingMode.HALF_UP);

public static int convertToInt(BigDecimal degrees) throws
ArithmeticException
{
return (degrees.divide(LSBvalue)).intValue();
}

The simple call below:

BigDecimal AngleDegrees = new BigDecimal(0.9118);
int AngleBams = convertToInt(AngleDegrees);

results in the following exception:

java.lang.ArithmeticException: Non-terminating decimal expansion; no
exact representable decimal result.
at java.math.BigDecimal.divide(BigDecimal.java:1603)
at BamBam.Angle.convertToInt(Angle.java:47)
at BamBam.Angle.main(Angle.java:73)

I am new to BigDecimal and not sure what I am doing wrong. Can
anyone help?

BigDecimal is exact.

And it seems as you are making a calculation that requires an
infinite number of decimals to represent the result.

Maybe you really want floating point and just have to live
with its behavior.

Arne

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