const byte botoes[] = {13, 27, 26, 25, 33, 32, 35, 34, 18};


struct Groups {
  struct GroupA {
    enum : byte
    {
      zero = 0,
      one,
      two,
      three,
      four,
      five,
      six,
      seven,
      eight
    };
  };

  struct GroupB {
    unsigned int zero = 0,
                 one = 1,
                 two = 2,
                 three = 3,
                 four = 4,
                 five = 5,
                 six = 6,
                 seven = 7,
                 eight = 8;
  };

  struct GroupC {
    static const unsigned int zero,
           one,
           two,
           three,
           four = 4,
           five,
           six,
           seven,
           eight;
  };

  struct GroupD {
    static unsigned int zero,
           one,
           two,
           three,
           four,
           five,
           six,
           seven,
           eight;
  };
};

unsigned int Groups::GroupD::four = 4;

Groups::GroupB grupoB;


//' Protótipos de função
void ChecarBotoes();

void setup()
{
  //# setup botões //
  for (byte i = 0; i < 9; i++)
  {
      pinMode(botoes[i], INPUT_PULLDOWN);
  }

  Serial.begin(9600);

  byte valueA = Groups::GroupA::one; // Access GroupA's `one`

  grupoB.one = 99;
  byte valueB = grupoB.one; // Access GroupB's `two`

  Serial.print("Group A One: ");
  Serial.println(valueA); // Prints 1
  Serial.print("Group B Two: ");
  Serial.println(valueB); // Prints 2


  switch (grupoB.one)
  {
    //* curly braces needed in a ´switch´ statement if a variable is created in it
    case 1:
      Serial.println(1);
      break;
    case 99:
      {
        int r = 3, g = 4;

        Serial.println(g);
        Serial.println(float(r) / Groups::GroupD::four);
        break;
      }
    default:
      Serial.println("Erro: Dia inválido");
      break;
  }

}

void loop()
{
  ChecarBotoes();
}


void ChecarBotoes()
{
    for (byte i = 0; i < 9; i++)
    {
        if (digitalRead(botoes[i]) == HIGH)
        {
            Serial.println("Botão " + String(i) + " pressionado");
            delay(50);
        }
    }
}