int A = 8;
int B = 9;
int C = 3;
int D = 4;
int E = 5;
int F = 7;
int G = 6;
int DP = 2;

int KeadaanTombol;
int TombolSebelumnya = 1;
int hitung = 0;


void setup() {
  // put your setup code here, to run once:
  pinMode (2,OUTPUT);
  pinMode (3,OUTPUT);
  pinMode (4,OUTPUT);
  pinMode (5,OUTPUT);
  pinMode (6,OUTPUT);
  pinMode (7,OUTPUT);
  pinMode (8,OUTPUT);
  pinMode (9,OUTPUT);
  pinMode (13,INPUT_PULLUP);
  digitalWrite (DP, HIGH);
  digitalWrite (A, HIGH);
  digitalWrite (B, HIGH);
  digitalWrite (C, HIGH);
  digitalWrite (D, HIGH);
  digitalWrite (E, HIGH);
  digitalWrite (F, HIGH);
  digitalWrite (G, HIGH);
  Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
  KeadaanTombol = digitalRead (13);

  if (KeadaanTombol != TombolSebelumnya){
    if (KeadaanTombol == LOW){
      if (hitung == 9){
        hitung = -1;
      }
      hitung ++;
      Serial.println (hitung);
      TambahAngka (hitung);
      delay (100);
    }
  }
}

void TambahAngka (int TampilAngka){
  switch (TampilAngka){
    case 0:
    digitalWrite (A, LOW);
    digitalWrite (B, LOW);
    digitalWrite (C, LOW);
    digitalWrite (D, LOW);
    digitalWrite (E, LOW);
    digitalWrite (F, LOW);
    digitalWrite (G, HIGH);
    break;
    
    case 1:
    digitalWrite (A, HIGH);
    digitalWrite (B, LOW);
    digitalWrite (C, LOW);
    digitalWrite (D, HIGH);
    digitalWrite (E, HIGH);
    digitalWrite (F, HIGH);
    digitalWrite (G, HIGH);
    break;

    case 2:
    digitalWrite (A, LOW);
    digitalWrite (B, LOW);
    digitalWrite (C, HIGH);
    digitalWrite (D, LOW);
    digitalWrite (E, LOW);
    digitalWrite (F, HIGH);
    digitalWrite (G, LOW);
    break;

    case 3:
    digitalWrite (A, LOW);
    digitalWrite (B, LOW);
    digitalWrite (C, LOW);
    digitalWrite (D, LOW);
    digitalWrite (E, HIGH);
    digitalWrite (F, HIGH);
    digitalWrite (G, LOW);
    break;

    case 4:
    digitalWrite (A, HIGH);
    digitalWrite (B, LOW);
    digitalWrite (C, LOW);
    digitalWrite (D, HIGH);
    digitalWrite (E, HIGH);
    digitalWrite (F, LOW);
    digitalWrite (G, LOW);
    break;

    case 5:
    digitalWrite (A, LOW);
    digitalWrite (B, HIGH);
    digitalWrite (C, LOW);
    digitalWrite (D, LOW);
    digitalWrite (E, HIGH);
    digitalWrite (F, LOW);
    digitalWrite (G, LOW);
    break;

    case 6:
    digitalWrite (A, LOW);
    digitalWrite (B, HIGH);
    digitalWrite (C, LOW);
    digitalWrite (D, LOW);
    digitalWrite (E, LOW);
    digitalWrite (F, LOW);
    digitalWrite (G, LOW);
    break;

    case 7:
    digitalWrite (A, LOW);
    digitalWrite (B, LOW);
    digitalWrite (C, LOW);
    digitalWrite (D, HIGH);
    digitalWrite (E, HIGH);
    digitalWrite (F, HIGH);
    digitalWrite (G, HIGH);
    break;

    case 8:
    digitalWrite (A, LOW);
    digitalWrite (B, LOW);
    digitalWrite (C, LOW);
    digitalWrite (D, LOW);
    digitalWrite (E, LOW);
    digitalWrite (F, LOW);
    digitalWrite (G, LOW);
    break;

    case 9:
    digitalWrite (A, LOW);
    digitalWrite (B, LOW);
    digitalWrite (C, LOW);
    digitalWrite (D, LOW);
    digitalWrite (E, HIGH);
    digitalWrite (F, LOW);
    digitalWrite (G, LOW);
    break;
  }
}