(+18)原=00010010
(+18)反=01101101
(+18)補=00010010
(-18)原=10010010
(-18)反=11101101
(-18)補=11101110
(+31)原=00011111
(+31)反=01100000
(+31)補=00011111
(-31)原=10011111
(-31)反=11100000
(-31)補=11100001
(+127)原=01111111
(+127)反=00000000
(+127)補=01111111
(-127)原=11111111
(-127)反=10000000
(-127)補=10000001
2.(1)設有兩個定點小數X=-.010111,y=+0.10001,用補碼的加法求真值X+Y;
(2)設X=-11001,y=-10011,采用雙符號位補碼計算真值X-Y.