Add expt #26
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Add expt #26
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kou
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Nov 30, 2025
| base = SCM_INT_VALUE(_base); | ||
| expo = SCM_INT_VALUE(_expo); | ||
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| if (expo < 0) ERR(ERRMSG_NEGATIVE_EXP); |
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Could you add a comment why we return an error here?
src/number.c
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| if (expo % 2 == 1) | ||
| result *= base; | ||
| base *= base; | ||
| expo /= 2; |
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Could you use spaces instead of tabs for indent?
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Tests fail with However, I did (assert-error (tn) (expt 3 -2))which I suppose would work (?) |
kou
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Dec 1, 2025
Co-authored-by: Sutou Kouhei <kou@cozmixng.org>
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Thanks. |
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It signals an error when the exponent is negative, since sigscheme only implements integer math.
This is an iterative implementation of exponentiation by squaring - and it works with negative bases.