“&”的用法与“&&” [英] Usage of '&' versus '&&'

问题描述

我遇到了这个问题：

bool Isvalid = isValid & CheckSomething()

bool Isvalid = isValid && CheckSomething()

第二种情况可能是发生短路的情况。

The second case could be a scenario for short circuiting.

所以我们不能总是只使用& 而不是& ？

So can't we always use just & instead of &&?

推荐答案

& 是按位 AND，表示它在位级别起作用。 & 是逻辑的，这意味着它可以在布尔（真/假）级别工作。逻辑AND使用短路（如果第一部分为假，则没有用处检查第二部分）来防止运行过多的代码，而按位AND则需要对每一位进行操作才能确定结果。

& is a bitwise AND, meaning that it works at the bit level. && is a logical AND, meaning that it works at the boolean (true/false) level. Logical AND uses short-circuiting (if the first part is false, there's no use checking the second part) to prevent running excess code, whereas bitwise AND needs to operate on every bit to determine the result.

您应该使用逻辑AND（&& ），因为这就是您想要的，而& 可以可能做错了事。但是，如果要评估其副作用，则需要单独运行第二种方法：

You should use logical AND (&&) because that's what you want, whereas & could potentially do the wrong thing. However, you would need to run the second method separately if you wanted to evaluate its side effects:

var check = CheckSomething();
bool IsValid = isValid && check;

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