加法:
carry = 进位 = AND
xor = remains.
减法：
The~operator flipsallthe bits; the1s (4 of them) become0s, and the0s (N-4 of them) become1s
乘法：递归
加法:
carry = 进位 = AND
xor = remains.
减法：
The~operator flipsallthe bits; the1s (4 of them) become0s, and the0s (N-4 of them) become1s
乘法：递归
本文标题：位运算加减乘除
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