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P195 末行（19.3 简易计算器）的 ((-) x) 应为 (subtract x)。否则被减数和减数是反的。 #57

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SnowOnion opened this issue May 5, 2020 · 0 comments

SnowOnion commented May 5, 2020 •

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代码恰好可见于 6050572#diff-8c949560d14df22da6a43f382a0f8ec8R28
原文为：

(~-) :: Double -> State Double (Double -> Double)
(~-) x = State $ \s -> (((-)x), s - x)

根据本 demo 的功能，((-)x) 想要的效果是 \y -> y - x 或者说 subtract x。但 ((-)x) 的效果是 \y -> x - y。

The text was updated successfully, but these errors were encountered:

SnowOnion changed the title ~~P195 末行的 ((-) x) 应为 (subtract x)。否则被减数和减数是反的。~~ P195 末行（19.3 简易计算器）的 ((-) x) 应为 (subtract x)。否则被减数和减数是反的。

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