Unicode 在 C 预处理器中定义语句

Question

I was doing some testing and fiddling about and noticed the C preprocessor does not let me use unicode with the define directive. Below is an example of my plight.

#include <stdio.h>

#define φαντασία fancy

int main() {
        printf("Is the C preprocessor φαντασία?");
}

It is giving me this output...

$ ./a.out 
Is the C preprocessor φαντασία?

Is there some way to fix this behaviour, it seems worthy of a feature request perhaps. Have I done something wrong?

Answer 1

Preprocessor replacement doesn't work on text; it works on tokens . When your printf line is processed, text is converted to 5 tokens first:

1. identifier token printf
2. punctuator token (
3. string-literal token "Is the C preprocessor φαντασία?"
4. punctuator token )
5. punctuator token ;

Only identifier type tokens are considered by macro replacement system.