是否总是在预处理程序之前处理注释？ [英] Are comments always processed before the preprocessor?

问题描述

/*
#define FOO
*/

#ifdef FOO
#define BAR "pirate"
#else
#define BAR "ninja"
#endif

int main() { printf(BAR); getchar(); }

在此代码中未定义FOO（Visual Studio 2008）。我假设注释首先被处理，然后是预处理器，然后是代码。是否总是在预处理程序之前处理注释？这是标准的一部分吗？

In this code FOO is not defined (Visual Studio 2008). I assume that comments are processed first, then preprocessor, and then code. Are comments always processed before the preprocessor? Is this part of a standard?

推荐答案

我假设首先处理注释，然后进行预处理，然后进行编码。注释是否总是在预处理程序之前进行处理？

I assume that comments are processed first, then preprocessor, and then code. Are comments always processed before the preprocessor?

排序的工作部分- 被删除评论。在这种情况下，您不必在指令内部添加指令。它仍然像其他评论一样被删除。

Sort of -- part of the preprocessor's job is to remove comments. In this case, it doesn't care that you have the directive inside the comments; it's still removed just like any other comment.

这篇关于是否总是在预处理程序之前处理注释？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！