Re: Decimal display for very large/small numbers

On Apr 2, 2:51 am, "Andrew Thompson via JavaKB.com" <u32984@uwe>
wrote:


Thanks for thinking about it, and for the URL. Although I should have
been, I wasn't familiar with SSCCE. Your suggestion that preparing an
SSCCE almost always helps in solving the problem was correct in this
case. I managed to answer my own question by going through the
exercise (after a weekend of frustration!). So, for the sake of
completeness, here's the correct code.

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.math.BigDecimal;
import java.math.MathContext;
import java.text.DecimalFormat;

public class TestDecimals {

    public TestDecimals() {
    }

    public static void main(String[] args) throws IOException {
        InputStreamReader reader = new InputStreamReader(System.in);
        BufferedReader buf_in = new BufferedReader(reader);
        String read = "0"; //exit string (zero)

        do {
            int precision = 6; //User input
            DecimalFormat decimals = new DecimalFormat();
            Double dbl = null;
            read = buf_in.readLine();
            Double ddbl = dbl.parseDouble(read); //User input
            BigDecimal convertValue = BigDecimal.valueOf(ddbl);
            BigDecimal convertedResult = converter(ddbl);
            decimals.setMaximumFractionDigits(precision);
            decimals.setMinimumFractionDigits(precision);
            if (convertedResult.doubleValue()>10E6 ||
convertedResult.doubleValue()<10E-6) {
                BigDecimal bd = convertedResult.round(new
MathContext(precision + 1));
                System.out.println("The result (MathContext adjusted)
is: " + bd);
            } else {
                System.out.println("The result (decimal format
adjusted) is: " + decimals.format(convertedResult).toString());
            }
        } while (!read.toLowerCase().equals("0"));
    }

    public static BigDecimal converter(Double testValue) {
        if (testValue > 1000) {
            BigDecimal result = new BigDecimal(testValue / 10E-6);
            return result;
        } else if (testValue < 0.0001) {
            BigDecimal result = new BigDecimal(testValue / 10E6);
            return result;
        } else {
            BigDecimal result = new BigDecimal(testValue);
            return result;
        }
    }
}