void setup() 
{
  Serial.begin(115200);
  Serial.print("1/58 = ");

  // 30 digits, that is about 20 digits of pure nonsense !
  Serial.println(1.0/58.0, 30); 

  // Speed of sound in air:
  //  at  0 °C  331 m/s
  //  at 20 °C  343 m/s
  //  at 40 °C  355 m/s
  //
  // The sound travels to the object and has to return.
  // That is twice the distance.
  //
  // 343 m/s is 0.0343 cm/µs and then half of that.
  Serial.print("Using the speed of sound: ");
  Serial.println(0.0343/2.0, 11);
  
  Serial.println();
}

void loop() 
{
  delay(10);
}