宏观问题 [英] macro problem

问题描述

我如何编写一个宏来执行作为参数的3个变量之间的交换？

how do i write a macro that performs swapping among 3 variables taken as parameters?

推荐答案

请描述你希望这个宏做什么。什么与什么交换？这是一个起点：

#define MACRO（P1，P2，P3）......

您可以用P1，P2和方式描述所需的行为P3。

Please describe what you want this macro to do. What gets swapped with what? Here''s a starting point:
#define MACRO(P1,P2,P3) ...
You can describe the desired behavior in terms of P1, P2, and P3.

问题是问题陈述与我发布的完全相同。

the problem is that the question states exactly the same way as i posted.

你将不得不要求老师澄清。

如果要求你交换两个变量，意图就会很明显。 在三个变量之间交换可能意味着任何数量的东西。

You''ll have to ask the teacher for clarification.
The intent would be obvious if you were asked to swap two variables. "Swapping among three variables" could mean any number of things.

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