Question

计算机原理组成问题.1.在字长为8位的计算机中,+18,-18,+31,-31,+127,-127的原码、反码和补码各为

Answer 1

1.在字长为8位的计算机中,+18,-18,+31,-31,+127,-127的原码、反码和补码各为多少?

(+18)原=00010010

(+18)反=01101101

(+18)补=00010010

(-18)原=10010010

(-18)反=11101101

(-18)补=11101110

(+31)原=00011111

(+31)反=01100000

(+31)补=00011111

(-31)原=10011111

(-31)反=11100000

(-31)补=11100001

(+127)原=01111111

(+127)反=00000000

(+127)补=01111111

(-127)原=11111111

(-127)反=10000000

(-127)补=10000001

2.（1）设有两个定点小数X=-.010111,y=+0.10001,用补码的加法求真值X+Y；

（2）设X=-11001,y=-10011,采用双符号位补码计算真值X-Y.