补码加减法：X=+1000100,Y=+1110,求X+Y,X-Y的值
若是16位二进制数.
则：(X)原码=0000000001000100
(Y)原码=0000000000001110
(Y)反码=1111111111110001
(Y)补码=1111111111110010
X+Y=(X)原码+(Y)原码
=0000000001000100+0000000000001110
=0000000001010010
X-Y=(X)原码+(Y)补码
=0000000001000100+1111111111110010
=0000000000110110