再次浮点 [英] Floating point again

问题描述

昨天我问了一个浮点问题，我还有一个。我做了一些计算，我使用math.h中的结果（C语言）正弦，余弦和正切函数。

Yesterday I asked a floating point question, and I have another one. I am doing some computations where I use the results of the math.h (C language) sine, cosine and tangent functions.

一个开发商含糊地说，你必须要小心这些函数的返回值的，我不应该做出的GCC数学函数的返回值的假设。我不是要开始讨论，但我真的想知道我需要提防的标准数学函数做计算时。

One of the developers muttered that you have to be careful of the return values of these functions and I should not make assumptions on the return values of the gcc math functions. I am not trying to start a discussion but I really want to know what I need to watch out for when doing computations with the standard math functions.

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推荐答案

您不应该期望罪（PI / 6）等于COS（PI / 3），例如。你也不应该期望ASIN（SIN（X））等于X，即使x是为罪域。他们会接近，但可能不会是平等的。

You should not expect sin(PI/6) to be equal to cos(PI/3), for example. Nor should you expect asin(sin(x)) to be equal to x, even if x is in the domain for sin. They will be close, but might not be equal.

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