机器字长为n位的二进制数可以用补码来表示（ ）个不同的有符号定点小数。
- A.见图A
- B.见图B
- C.见图C
- D.见图D
正确答案及解析
正确答案
解析
本题考查计算机系统基础常识。二进制数据在计算机系统中的表示方法是最基本的专业知识。补码本身是带符号位的，补码表示的数字中0是唯一的，不像原码有+0和-0之分，也就意味着位n二进制编码可以表示2n个不同的数。
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