ProgBasicsJavaBook3.1SimpleConditions08MetricConverter

import java.util.Scanner;

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

        double size = Double.parseDouble(scanner.nextLine());
        String sourceMetric = scanner.nextLine();
        String destinationMetric = scanner.nextLine();

        double convertedToMeter = 0;
        double convertedToOutputMetric = 0;

        if ("m".equalsIgnoreCase(sourceMetric)) {
            convertedToMeter = size;
        } else if ("mm".equalsIgnoreCase(sourceMetric)) {
            convertedToMeter = size / 1000;
        } else if ("cm".equalsIgnoreCase(sourceMetric)) {
            convertedToMeter = size / 100;
        } else if ("mi".equalsIgnoreCase(sourceMetric)) {
            convertedToMeter = size / 0.000621371192;
        } else if ("in".equalsIgnoreCase(sourceMetric)) {
            convertedToMeter = size / 39.3700787;
        } else  if ("km".equalsIgnoreCase(sourceMetric)){
            convertedToMeter = size * 1000;
        } else  if ("ft".equalsIgnoreCase(sourceMetric)){
            convertedToMeter = size / 3.2808399;
        } else if ("yd".equalsIgnoreCase(sourceMetric)) {
            convertedToMeter = size / 1.0936133;
        }

        if ("m".equalsIgnoreCase(destinationMetric)) {
            convertedToOutputMetric = convertedToMeter;
        } else if ("mm".equalsIgnoreCase(destinationMetric)) {
            convertedToOutputMetric = convertedToMeter * 1000;
        } else if ("cm".equalsIgnoreCase(destinationMetric)) {
            convertedToOutputMetric = convertedToMeter * 100;
        } else if ("mi".equalsIgnoreCase(destinationMetric)) {
            convertedToOutputMetric = convertedToMeter * 0.000621371192;
        } else if ("in".equalsIgnoreCase(destinationMetric)) {
            convertedToOutputMetric = convertedToMeter * 39.3700787;
        } else  if ("km".equalsIgnoreCase(destinationMetric)){
            convertedToOutputMetric = convertedToMeter / 1000;
        } else  if ("ft".equalsIgnoreCase(destinationMetric)){
            convertedToOutputMetric = convertedToMeter * 3.2808399;
        } else if ("yd".equalsIgnoreCase(destinationMetric)) {
            convertedToOutputMetric = convertedToMeter * 1.0936133;
        }

        System.out.printf("%.8f", convertedToOutputMetric);
    }
}