某机器的字长为8,符号位占1位，数据位占7位，采用补码表示时的最小整数 为（ ）。
- A.-2^8
- B.-2^7
- C.-2^7+l
- D.-2^8+1
正确答案及解析
正确答案
解析
补码表示的规则是：用最高位表示符号，正数用0表示，负数用1表示，正数的补码是其原码本身，负数的补码的数值部分是对其原码的数值部分按位取反后加1。例如， 十进制整数+1的补码表示为00000001，-1的补码表示为11111111。机器字长为8时，用7位表示数值，最大整数值为12^7 (补码表示为01111111)，最小整数值为-12^8=-2^7 (补码表示为10000000)。
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