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Rule of rounding applies to both sides of the decimal point

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Matt Borland
2025-06-16 14:12:38 -04:00
parent b1c017de47
commit 437fec2db3
1 changed files with 2 additions and 1 deletions
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include/boost/charconv/detail/dragonbox/floff.hpp
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@@ -4018,9 +4018,10 @@ round_up_all_9s:
++decimal_dot_pos;
}
}
else if (decimal_exponent_normalized == 0)
else if (decimal_exponent_normalized == 0 || remaining_digits == 1)
{
// For the case 0.99...9 -> 1.00...0, the rounded digit is one before the first digit written.
// This same case applies for 0.099 -> 0.10 in the precision = 2 instance
// Note: decimal_exponent_normalized was negative before the increment (++decimal_exponent_normalized),
// so we already have printed "00" onto the buffer.
// Hence, --digit_starting_pos doesn't go more than the starting position of the buffer.