nextInt() for Arduino serial communication

Arduino - nextInt

// Main method to call to get an integer.
// It will block until an integer followed by a non-digit delimiter is read from the serial input stream.
int getInt() {
  return getInt(0);
}

// Recursive helper method.
// @param sum - an accumulator that "builds" the next number, character by character.
int getInt(int sum) {
  // Read a single character from the serial input stream.
  char c = Serial.read();
  // If it is not a digit character, return whats in the accumulator.
  if (c < 48 || c > 57) 
    return sum;
  // Otherwise, shift the digits in the accumulator over by 1 decimal place and add the next digit to them. Once
  // the value is computed, pass the new accumulator value to another call to getInt. 
  sum = sum * 10;
  return getInt(sum + ((int) (c - 48)) );
}