采用( )表示带符号数据时,算术运算过程中符号位与数值位采用同样的运算规则进行处理。
- A.补码
- B.原码
- C.反码
- D.海明码
正确答案及解析
正确答案
解析
本题考查原码、反码、补码和移码的基础知识。
①原码运算要注意的问题:它的数值部分就是该数的绝对值,但是它的加减法运算较复杂。当两数相加时,首先判断两数的符号是否相同,如果相同则两数相加,若符号不同,则两数相减;
②反码运算要注意的问题:反码运算时,其符号位与数值一起参加运算。反码的符号位相加后,如果有进位出现,则要把它送回到最低位去相加(循环进位)。用反码运算,其运算结果亦为反码。在转换为真值时,若符号位为0,数位不变;若符号位为1,应将结果求反才是其真值;
③补码运算要注意的问题:补码运算时,其符号位与数值部分一起参加运算,采用一样的规则不需要特殊处理。因此用补码进行加减运算要简便的多,这也是大多数计算机采用的方式。补码的符号位相加后,如果有进位出现,要把这个进位舍去(自然丢失)。用补码运算,其运算结果亦为补码。在转换为真值时,若符号位为0,数位不变;若符号位为1,应将结果求补才是其真值。
A选项正确。
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