#include <stdio.h>
#include <math.h>

#define a1
#define a2
#define a3
void setup() {
  Serial.begin(9600);
    int ROM ;
      switch (ROM){
          case d1 :
              if(a1==0 || a2==0 || a3==0){
                    Serial.print($01);
                          break;
                                default:
                                break;
                                }

                                void loop() {
                                  Serial.print("Masukkan nilai a1 = ");
                                    scanf("%d \n", &a1);
                                      Serial.print("Masukkan nilai a2 = ");
                                        scanf("%d", &a2);
                                          Serial.print("Masukkan nilai a3 = ");
                                            scanf("%d", &a3);
                                    Serial.println("nilai hasil = \" , );
                                              }