作者ric2k1 (Ric)
看板EE_DSnP
标题Re: [问题] 请问投影片p41
时间Sun Sep 28 18:50:20 2008
※ 引述《avocado (Sign..)》之铭言：
: 想请问老师一下
: exponent e 的range那边为何要保留all 0s & all 1s 呢?
: 这边不是很了解
: 谢谢~!!
F = (-1)s * 1.f * 2(e - 127)
Zero (i.e. 0.0)
===============
e = all 0’s && f = all 0’s
+0 and -0 are different representations; but are compared equal
Infinity
========
e = all 1’s && f = all 0’s
Denormalized numbers
====================
e = all 0’s && f != all 0’s
F = (-1)s * 0.f * 2-126
Can represent numbers as small as (1 - 2-23) * 2-126
Not a Number (NaN)
==================
e = all 1’s && f = certain non-0 number
For more information, please refer to IEEE 754 standard.
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1F：→ ric2k1:不过大家投影片看得好仔细啊! 09/28 18:50
2F：推 avocado:XD ~~ 09/29 13:32