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Merge pull request #6793 from mattn/fix/readfloat-correctly-rounded

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Yukihiro "Matz" Matsumoto
2026-04-16 17:09:10 +09:00
committed by GitHub
parent 2f5a24ed9b 10c9e83128
commit a6a92bf95b
1 changed files with 3 additions and 2 deletions
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src/readfloat.c
+3 -2
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@@ -168,10 +168,11 @@ mrb_read_float(const char *str, char **endp, double *fp)
res = (double)int_part;
}
else {
// Fast path: combine integer and fractional parts
// Divide by the exact 10^n (exact for n <= 22) rather than multiplying
// by the inexact 10^-n, so the fraction is correctly rounded.
res = (double)int_part;
if (frac_digits > 0) {
res += (double)frac_part * mrb_pow10(-frac_digits);
res += (double)frac_part / mrb_pow10(frac_digits);
}
}