04. Metric Converter

package conditionalStatements;

import java.util.Scanner;

public class P04MetricConverter {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        double num = Double.parseDouble(scanner.nextLine());
        String inputUnit = scanner.nextLine();
        String outputUnit = scanner.nextLine();

        if (inputUnit.equals("mm")) {
            num = num / 1000;
        } else if (inputUnit.equals("cm")) {
            num = num / 100;
        }

        if (outputUnit.equals("mm")) {
            num = num * 1000;
        } else if (outputUnit.equals("cm")) {
            num = num * 100;
        }

        System.out.printf("%.3f", num);
    }
}