Програмата ми гърми на 78% и не мога да разбера, защо?

import java.text.DecimalFormat;
import java.util.Scanner;

public class ConvertMetric {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        DecimalFormat decimalFormat = new DecimalFormat("#.########");

        double value = Double.parseDouble(scanner.nextLine());

        String input = scanner.nextLine();
        String output = scanner.nextLine();

        double m = 1.0;
        double mm = 1000;
        double cm = 100;
        double mi = 0.000621371192;
        double in = 39.3700787;
        double km = 0.001;
        double ft = 3.2808399;
        double yd = 1.0936133;

        switch (input){
            case "m":
                value = value / m;
                break;
            case "mm":
                value = value / mm;
                break;
            case "cm":
                value = value / cm;
                break;
            case "mi":
                value = value / mi;
                break;
            case "in":
                value = value / in;
                break;
            case "km":
                value = value / km;
                break;
            case "ft":
                value = value / ft;
            case "yd":
                value = value / yd;
                break;
            default:
                break;
        }
        switch (output){
            case "m":
                value = value * m;
                break;
            case "mm":
                value = value * mm;
                break;
            case "cm":
                value = value * cm;
                break;
            case "mi":
                value = value * mi;
                break;
            case "in":
                value = value * in;
                break;
            case "km":
                value = value * km;
                break;
            case "ft":
                value = value * ft;
            case "yd":
                value = value * yd;
                break;
            default:
                break;
        }
        System.out.println(decimalFormat.format(value));

    }
}