08b. Metric Converter

/*
 * Simple Conditions
 */
import java.math.BigDecimal;
import java.util.Scanner;

public class _08b_MetricConverter
{
    public static void main(String[] args)
    {
        Scanner scan = new Scanner(System.in);

        double inValue = Double.parseDouble(scan.nextLine());
        String inUnit = scan.nextLine();
        String outUnit = scan.nextLine();

        double meters;
        BigDecimal outValue;

        switch (inUnit)
        {
            case "mm": meters = inValue / 1000d; break;
            case "cm": meters = inValue / 100d; break;
            case "mi": meters = inValue / 0.000621371192; break;
            case "in": meters = inValue / 39.3700787; break;
            case "km": meters = inValue / 0.001; break;
            case "ft": meters = inValue / 3.2808399; break;
            case "yd": meters = inValue / 1.0936133; break;
            default: meters = inValue;
        }

        switch (outUnit)
        {
            case "mm": outValue = new BigDecimal(meters * 1000d); break;
            case "cm": outValue = new BigDecimal(meters * 100d); break;
            case "mi": outValue = new BigDecimal(meters * 0.000621371192); break;
            case "in": outValue = new BigDecimal(meters * 39.3700787); break;
            case "km": outValue = new BigDecimal(meters * 0.001); break;
            case "ft": outValue = new BigDecimal(meters * 3.2808399); break;
            case "yd": outValue = new BigDecimal(meters * 1.0936133); break;
            default: outValue = new BigDecimal(meters);
        }
        System.out.printf("%f %s", outValue, outUnit);
    }
}