C宏定义可以引用其他宏吗？

本文介绍了C宏定义可以引用其他宏吗？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我要弄清楚的是这样的东西（用 C 编写）：

What I'm trying to figure out is if something such as this (written in C):

#define FOO 15 #define BAR 23 #define MEH (FOO / BAR)

是允许的吗？我希望预处理器替换每个实例

is allowed? I would want the preprocessor to replace every instance of

MEH

与

(15 / 23)

但我不确定这样做是否可行。当然，如果预处理器只执行一次代码，那么我认为它不会满足我的要求。

but I'm not so sure that will work. Certainly if the preprocessor only goes through the code once then I don't think it'd work out the way I'd like.

我找到了几个类似的示例，但所有示例对我来说真的太复杂了。如果有人可以帮助我解决这个简单的问题，我将不胜感激！

I found several similar examples but all were really too complicated for me to understand. If someone could help me out with this simple one I'd be eternally grateful!

推荐答案

简短的回答是。您可以嵌套这样的定义和宏-只要不递归就可以根据需要设置多个级别。

Short answer yes. You can nest defines and macros like that - as many levels as you want as long as it isn't recursive.