MetricConverter

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package softuni;

import java.util.Scanner;

/**
 * @author Kristiyan Dimov
 */
public class MetricConverter {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        Scanner s = new Scanner(System.in);

        double number = s.nextDouble();
        String input = s.next().toLowerCase();
        String output = s.next().toLowerCase();

        double mm = 1000.0;
        double cm = 100.0;
        double mi = 0.000621371192;
        double in = 39.3700787;
        double km = 0.001;
        double ft = 3.2808399;
        double yd = 1.0936133;
        double m = 1.0;


        switch (input) {
            case "mm":
                number = number / mm;
                break;
            case "cm":
                number = number / cm;
                break;
            case "mi":
                number = number / mi;
                break;
            case "in":
                number = number / in;
                break;
            case "km":
                number = number / km;
                break;
            case "ft":
                number = number / ft;
                break;
            case "yd":
                number = number / yd;
                break;
            case "m":
                number = number / m;
                break;
        }
        switch (output) {
            case "mm":
                number = number * mm;
                break;
            case "cm":
                number = number * cm;
                break;
            case "mi":
                number = number * mi;
                break;
            case "in":
                number = number * in;
                break;
            case "km":
                number = number * km;
                break;
            case "ft":
                number = number * ft;
                break;
            case "yd":
                number = number * yd;
                break;
            case "m":
                number = number * m;
                break;
        }
        //  System.out.println(number + " " + output);
        System.out.printf("%f", number);

        /*if (input.equals("mm")) {
             number = number / mm;
         }
        else if (input.equals("cm")) {
            number = number / cm;
        }
        else if (input.equals("mi")) {
            number = number / mi;
        }
        else if (input.equals("in")) {
            number = number / in;
        }
        else if (input.equals("km")) {
            number = number / km;
        }
        else if (input.equals("ft")) {
            number = number / ft;
        }
        else if (input.equals("yd")) {
            number = number / yd;
        }
        else if (input.equals("m")) {
            number = number / m;
        }


        /*if (output.equals("mm")) {
            number = number * mm;
        }
        else if (output.equals("cm")) {
            number = number * cm;
        }
        else if (output.equals("mi")) {
            number = number * mi;
        }
        else if (output.equals("in")) {
            number = number * in;
        }
        else if (output.equals("km")) {
            number = number * km;
        }
        else if (output.equals("ft")) {
            number = number * ft;
        }
        else if (output.equals("yd")) {
            number = number * yd;
        }
        else if (output.equals("m")) {
            number = number * m;
        }
        System.out.println(number + " " + output);*/
    }

}