问题描述
在我的工作中，我们总是会遇到不必要的编码争论.今天我问条件 AND (&&) 或 OR (||) 是否具有更高的优先级.我的一位同事坚持说他们有相同的优先级，我有疑问，所以我查了一下.
We get into unnecessary coding arguments at my work all-the-time. Today I asked if conditional AND (&&) or OR (||) had higher precedence. One of my coworkers insisted that they had the same precedence, I had doubts, so I looked it up.
根据 MSDN，AND (&&) 的优先级高于 OR (||).但是，您能向持怀疑态度的同事证明这一点吗?
According to MSDN AND (&&) has higher precedence than OR (||). But, can you prove it to a skeptical coworker?
http://msdn.microsoft.com/en-us/library/aa691323(VS.71).aspx
bool result = false || true && false; // --> false
// is the same result as
bool result = (false || true) && false; // --> false
// even though I know that the first statement is evaluated as
bool result = false || (true && false); // --> false
所以我的问题是你如何用代码证明 AND (&&) 比 OR (||) 具有更高的优先级?如果你的回答是没关系，那为什么要在语言中这样构建呢?
So my question is how do you prove with code that AND (&&) has a higher precedence that OR (||)? If your answer is it doesn't matter, then why is it built that way in the language?
推荐答案
将第一个false改为true.我知道拥有 (true || true) 似乎很愚蠢，但它证明了你的观点.
Change the first false by true. I know it seems stupid to have (true || true) but it proves your point.
bool result = true || true && false; // --> true
result = (true || true) && false; // --> false
result = true || (true && false); // --> true
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