C中的逻辑相等 [英] Logical equality in C
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问题描述
[好像很奇怪,这个不存在,如果是重复的,请提前道歉]
[It seems odd this doesn't exist, so apologies in advance if it's a duplicate]
我想测试 C 中的逻辑相等性.换句话说,我想知道如果两个值都以与逻辑表达式相关的正常方式进行转换,两个值是否相等.
I want to test for logical equality in C. In other words, I want to know whether two values would be equal if both were converted in the normal way associated with logical expressions.
在 C99 中,我认为
In C99, I think that
(bool)a == (bool)b
给我想要的.那是对的吗?用传统 C 写这个的正常方式是什么?
gives what I want. Is that correct? What is the normal way of writing this in traditional C?
推荐答案
你通常会看到:
if ((a == 0) == (b == 0))
或者
if (!!a == !!b)
因为 !!a
如果 a 为非零则为 1,否则为 0.
Since !!a
evaluates to 1 if a is nonzero and 0 otherwise.
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