浮點數表示法 - 考試
By William
at 2014-04-23T19:17
at 2014-04-23T19:17
Table of Contents
設有一電子計算機以36位元代表一浮點數其中符號(sign bit)佔1位元,
指數部份分佔8位元,
小數部分(fraction)佔 27位元,
請問其所能表示之數值大小範圍為何?
127 127
(A) -0.FFFFFFE ×16 ~0.FFFFFFE ×16
16 16
127 127
(B) -0.FFFFFFF ×16 ~0.FFFFFFF ×16
16 16
127 128
(C) -0.FFFFFFF ×16 ~0.FFFFFFF ×16
16 16
128 128
(D) -0.FFFFFFF ×16 ~0.FFFFFFF ×16
16 16
答案為(B)
請問指數部份為127 8位元 2^8=256 所以可顯示兩個0~127嗎?
小數部份佔27位元 但是FFFFFFF 這不是有28個位元嗎?
以上問題 謝謝
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