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