0除以无限是否保证为0? [英] Is 0 divided by infinity guaranteed to be 0?

问题描述

根据此问题，对于n != 0，n/inf预期为零.何时n == 0呢?根据IEEE-754，(0 / inf) == 0始终是真的吗?

According to this question, n/inf is expected to be zero for n != 0. What about when n == 0? According to IEEE-754, is (0 / inf) == 0 always true?

推荐答案

从数学上讲，0/0是不确定的，0/anything_else是零. IEEE-754的工作方式相同.

Mathematically, 0/0 is indeterminate, and 0/anything_else is zero. IEEE-754 works the same way.

因此0/无穷大将产生零. 0/0将产生NaN.

So 0/infinity will yield a zero. 0/0 will yield a NaN.

注意:并非所有的C ++实现都支持IEEE浮点，有些不完全符合IEEE规范，因此这不一定是C ++问题.

Note: not all C++ implementations support IEEE floating point, and some that do so don't completely meet IEEE specifications, so this is not necessarily a C++ question.

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