round-off

基本解釋

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(diǎn)數(shù)字引起的很小的捨入錯(cuò)誤就會(huì)嚴(yán)重歪曲數(shù)學(xué)精度計(jì)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(guò)，對(duì)於負(fù)值的 x，一般是 -4 以下的數(shù)字，用於計(jì)算 Math.exp()的算法表現(xiàn)很差，竝且容易出現(xiàn)捨入錯(cuò)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(méi)有好，但絕對(duì)是一個(gè)糟糕的測(cè)試，因爲(wèi)除了真正起作用的東西外，也測(cè)試了許許多多無(wú)關(guān)的細(xì)節(jié)（如浮點(diǎn)捨入誤差）。

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