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January 17, 2017 23:58
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| (*!) :: (Ord a, Num a) => a -> a -> a | |
| (*!) a b = | |
| let | |
| multiply _ 0 t = t | |
| multiply a b t = multiply a (b - 1) (t + a) | |
| in | |
| if b >= 0 | |
| then multiply a b 0 | |
| else negate $ multiply a (negate b) 0 |
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