如何在C条件preprocessor-指令比较两个字符串 [英] how to compare string in C conditional preprocessor-directives

问题描述

我必须做这样的事情在C，但如果我用一个char它只能工作，但我需要一个字符串
我该怎么办？

i have to do something like this in C but it works only if I use a char but I need a string how can I do?

#define USER "jack" // jack or queen

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

感谢所有！

推荐答案

我不认为有办法做到可变长度的字符串比较完全preprocessor指令。你也许可以做到以下几点，但：

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

或者你也可以重构code一点点，采用C code来代替。

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

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