Question

已知:X=-1010,Y=0111,用二进制补码求X+Y

Answer 1

约定字长8位

X = - 1010b

[X]原 =1000 1010b

[X]反 =1111 0101b

.

[X]补 =1111 0110b

[Y]补 =0000 0111b (+

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[X+Y]补 =1111 1101b

[X+Y]反 =1111 1100b

[X+Y]原 =1000 0011b

X+Y = - 000 0011b = -3d