round-off

基本解释

Mathematically precise calculations can be thrown severely askew by small round-off errors caused by finite-precision floating-point numbers.
由有限精度浮點數字引起的很小的捨入錯誤就會嚴重歪曲數學精度計算。
However, for negative values of x, roughly -4 and lower, the algorithm used to calculate Math.exp() is relatively ill-behaved and subject to round-off error.
不過，對於負值的 x，一般是 -4 以下的數字，用於計算 Math.exp()的算法表現很差，竝且容易出現捨入錯誤。
While often better than no test at all, this is a terrible kind of test, because alongside the things that actually matter, it also tests a million irrelevant details (like floating point round-off).
通常這樣做比沒有好，但絕對是一個糟糕的測試，因爲除了真正起作用的東西外，也測試了許許多多無關的細節（如浮點捨入誤差）。

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