如何比较 C 条件预处理器指令中的字符串 [英] How to compare strings in C conditional preprocessor-directives

问题描述

我必须在 C 中做这样的事情.它只有在我使用 char 时才有效，但我需要一个字符串.我该怎么做?

I have to do something like this in C. It works only if I use a char, but I need a string. How can I do this?

#define USER "jack" // jack or queen

#if USER == "jack"
#define USER_VS "queen"
#elif USER == "queen"
#define USER_VS "jack"
#endif

推荐答案

我认为没有办法完全在预处理器指令中进行可变长度字符串比较.不过，您也许可以执行以下操作:

I don't think there is a way to do variable length string comparisons completely in preprocessor directives. You could perhaps do the following though:

#define USER_JACK 1
#define USER_QUEEN 2

#define USER USER_JACK 

#if USER == USER_JACK
#define USER_VS USER_QUEEN
#elif USER == USER_QUEEN
#define USER_VS USER_JACK
#endif

或者您可以稍微重构代码并改用 C 代码.

Or you could refactor the code a little and use C code instead.

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