doAdd method

UcumDecimal doAdd(UcumDecimal other)

Implementation

UcumDecimal doAdd(UcumDecimal other) {
  // Compute total number of decimal places for both numbers
  final int thisScale = digits.length - decimal;
  final int otherScale = other.digits.length - other.decimal;

  // Normalize numbers to have the same number of decimal places
  final String normalizedThisDigits = digits + '0' * (otherScale - thisScale);
  final String normalizedOtherDigits =
      other.digits + '0' * (thisScale - otherScale);

  // Prepare to sum the digits
  final int maxLength =
      math.max(normalizedThisDigits.length, normalizedOtherDigits.length);
  final String paddedThisDigits =
      normalizedThisDigits.padLeft(maxLength, '0');
  final String paddedOtherDigits =
      normalizedOtherDigits.padLeft(maxLength, '0');

  String resultDigits = '';
  int carry = 0;
  // Perform addition from right to left
  for (int i = maxLength - 1; i >= 0; i--) {
    final int sum = int.parse(paddedThisDigits[i]) +
        int.parse(paddedOtherDigits[i]) +
        carry;
    carry = sum ~/ 10;
    resultDigits = (sum % 10).toString() + resultDigits;
  }

  // Handle any remaining carry
  if (carry > 0) {
    resultDigits = carry.toString() + resultDigits;
  }

  // Calculate where the decimal should be placed
  final int resultDecimal =
      resultDigits.length - (thisScale > otherScale ? thisScale : otherScale);

  // Final construction of result UcumDecimal
  final UcumDecimal result = UcumDecimal()
    ..digits = resultDigits
    ..decimal = resultDecimal
    ..precision = math.min(precision, other.precision)
    ..scientific = scientific || other.scientific
    ..negative =
        negative; // Assuming addition of two positive numbers for simplicity

  return result;
}