恒实施例pression＆QUOT;的东西是，并且是没有，＆QUOT例子;用C？ [英] Example of something which is, and is not, a "Constant Expression" in C?

问题描述

我的是什么，是不是在C恒定防爆pression糊涂一点点，即使经过多次Googleing。你能提供的东西是一个例子，这是不是在C恒定防爆pression？

I'm a tad confused between what is and is not a Constant Expression in C, even after much Googleing. Could you provide an example of something which is, and which is not, a Constant Expression in C?

推荐答案

一个恒定的前pression可以在编译时进行评估。这意味着它有任何变量在它。例如：

A constant expression can be evaluated at compile time. That means it has no variables in it. For example:

5 + 7 / 3

是一个不断前pression。是这样的：

is a constant expression. Something like:

5 + someNumber / 3

不是，假设 someNumber 是一个变量（即本身不是一个编译时间常数）。

is not, assuming someNumber is a variable (ie, not itself a compile-time constant).

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