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mruby-rational (rational_pow): fix wrong power calculation

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`a/b ** -n` can be calculated by `b/a ** n` for correctness.
This commit is contained in:
Yukihiro "Matz" Matsumoto
2024-05-22 12:13:54 +09:00
parent d148bf8c0b
commit 7c2be58e2a
1 changed files with 6 additions and 0 deletions
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mrbgems/mruby-rational/src/rational.c
+6
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@@ -690,6 +690,12 @@ rational_pow(mrb_state *mrb, mrb_value x)
if (i == 1) {
return x;
}
if (i < 0) {
i = -i;
if (i < 0) rat_overflow(mrb);
return rational_new_i(mrb, (mrb_int)pow((mrb_float)p1->denominator, (mrb_float)i),
(mrb_int)pow((mrb_float)p1->numerator, (mrb_float)i));
}
return rational_new_i(mrb, (mrb_int)pow((mrb_float)p1->numerator, (mrb_float)i),
(mrb_int)pow((mrb_float)p1->denominator, (mrb_float)i));
}