Question

32-64的补码计算

Answer 1

约定机器数字长8位

x = 32d = 10 0000b

[x]补 = 0010 0000b

-y = -64d = - 100 0000b

[-y]原 = 1100 0000b

[-y]反 = 1011 1111b

[-y]补 = 1100 0000b

[x]补 = 0010 0000b

[-y]补 = 1100 0000b (+

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[x-y]补 = 1110 0000b

[x-y]反 = 1101 1111b

[x-y]原 = 1010 0000b

x-y = -010 0000b = - 32d