按位运算符简单地翻转整数中的所有位?

我必须翻转整数二进制表示中的所有位.给定:

I have to flip all bits in a binary representation of an integer. Given:

10101

输出应该是

01010

当与整数一起使用时,完成此操作的位运算符是什么?例如,如果我正在编写像 int flipBits(int n); 这样的方法,那么主体中会发生什么?我只需要翻转数字中已经存在的内容,而不是整数中的所有 32 位.

What is the bitwise operator to accomplish this when used with an integer? For example, if I were writing a method like int flipBits(int n);, what would go in the body? I need to flip only what's already present in the number, not all 32 bits in the integer.

推荐答案

~ 一元运算符是按位取反.如果您需要的位数少于 int 中的位数,那么您需要在事后使用 & 对其进行屏蔽.

The ~ unary operator is bitwise negation. If you need fewer bits than what fits in an int then you'll need to mask it with & after the fact.

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