c - 为什么-〜x等于x + 1？

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在Obfuscated C Code Contest 2006. Please explain sykes2.c中，

有一个语句“ -~i == i+1因为二进制补码”。

有人可以解释为什么会这样吗？

最佳答案

-~x等于x+1，因为~x等同于(0xffffffff-x)。这等于2秒补码中的(-1-x)，因此-~x是-(-1-x) = x+1。