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Java
       
import java.util.Scanner;

public class demoConv {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        System.out.println("Masukkan Angka: ");
        double angka = input.nextDouble();
        System.out.println("Masukkan Satuan(cm/m): ");
        String unitFrom = input.next();
        System.out.println("Masukkan Satuan yang diinginkan(m/mm): ");
        String unitTo = input.next();
        double hasil = 0;
        if (unitFrom.equals("cm") && unitTo.equals("m")) {
            hasil = convCM.cmKeMM(angka);
        } else if (unitFrom.equals("m") && unitTo.equals("mm")) {
            hasil = convMM.mkeMM(angka);
        } else {
            System.out.println("Unit Salah");
        }
        display.displayhasil(hasil);
    }
}

class convCM {
    public static double cmKeMM(double cm) {
        return cm / 100;
    }
}
class convMM {
    public static double mkeMM(double m) {
        return m * 1000;
    }
}

class display {
    public static void displayhasil(double hasil) {
        System.out.println("Hasilnya " + hasil);
    }
}

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