void setup() {
  for(int i = 12; i<=18; i++){
    pinMode(i, OUTPUT);
  }
}

void loop() {
  //--------Display 0----------//
  digitalWrite(12, 1); //A
  digitalWrite(13, 1); //B
  digitalWrite(14, 1); //C
  digitalWrite(15, 1); //D
  digitalWrite(16, 1); //E
  digitalWrite(17, 1); //F
  digitalWrite(18, 0); //G
  delay(1000);
  //--------Display 1----------//
  digitalWrite(12, 0); //A
  digitalWrite(13, 1); //B
  digitalWrite(14, 1); //C
  digitalWrite(15, 0); //D
  digitalWrite(16, 0); //E
  digitalWrite(17, 0); //F
  digitalWrite(18, 0); //G
  delay(1000);
}