下水浮点数是否总是四舍五入到零？
假设最小的代表数为0.1。
根据IEEE 754，是否为0.09（下底流量）为0或0.1？
Assume the smallest representable number is 0.1.
Is 0.09, underflow, be rounded to 0 or 0.1 according to IEEE 754?
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如果您有一些假设的浮点格式，其中最小的代表正数为0.1，并且某些操作的实数算术结果（例如9除以100）为.09，那么计算的结果将由根据为操作选择的舍入规则，将.09舍入.09至0.1或0。
默认的舍入规则是循环到最新的。由于0.1接近0.09，而不是0，因此结果为0.1。
如果选择了非默认规则圆向折叠或圆形零件零，则结果为0。
If you had some hypothetical floating-point format in which the smallest representable positive number were 0.1, and the real-number-arithmetic result of some operation, such as 9 divided by 100, were .09, then the computed result would be determined by rounding .09 to either 0.1 or 0 according to the rounding rule chosen for the operation.
The default rounding rule is round-to-nearest-ties-to-even. Since 0.1 is nearer to .09 than 0 is, 0.1 would be the result.
If the non-default rule round-downward or round-toward-zero had been chosen, the result would be 0.