void setup()
{
  pinMode(13, INPUT_PULLDOWN); // PULL_DOWN
  pinMode(15, INPUT_PULLUP);   // PULL_up
  
  pinMode(4, OUTPUT);
  pinMode(14, OUTPUT);
}

void loop()
{
  if (digitalRead(13) == 1)
  {
    digitalWrite(14, HIGH);
  }

  digitalWrite(14, LOW);


  if (digitalRead(15) == 0)
  {
    digitalWrite(4, HIGH);
  }

  digitalWrite(4, LOW);
}

/*
obs:
on example, "not" gate represents gpio pin
*/