/**
* Computes the number of fraction digits in a double. Used for computing maxFrac for an increment.
* Calls into the DoubleToStringConverter library to do so.
+ *
+ * @param singleDigit An output parameter; set to a number if that is the
+ * only digit in the double, or -1 if there is more than one digit.
*/
-digits_t doubleFractionLength(double input);
+digits_t doubleFractionLength(double input, int8_t* singleDigit);
} // namespace roundingutils