How can I use Japanese language characters in variable naming?

Question

I'm trying to use Japanese words in variable naming but C language doesn't appear to be work this way. Is there any way to fix this?

See my code below.

#include <stdio.h>

struct 忍び/* Shinobi */
{
    char 名前/* Namae */[50];
    char 血液型/* Ketsuekigata */[3];
    char 性別/* Seibetsu */[10];
    char 星占い/* Hoshi uranai*/[10];
    int 年齢/* Nenrei */;
};

int main(void)
{
    struct 忍び Uchiha_Itachi;
    Uchiha_Itachi.年齢 = 21;
    printf("the age of itachi > %d", Uchiha_Itachi.年齢);
}

Answer 1

C language doesn't appear to be work this way. Is there any way to fix this?

Support for such characters is implementation defined. Many compilers will not support this, a few might.

An identifier may contain non-digits (a-z, A-Z, _), digits (0-9), universal-character-name or other implementation-defined characters. C17 6.4.2 1

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Alternative

Since C99, code could use universal-character-name via \Unnnnnnnn or \unnnn - a not so pretty possibility.

An application would be to convert source code struct 忍び (that worked on one compiler) to struct \u5fcd\u3073 for other compilers.

https://www.branah.com/unicode-converter
忍び --> \u5fcd\u3073

#include <stdio.h>

struct \u5fcd\u3073/* Shinobi */ {
    char \u540d\u524d /* Namae */[50];
    char \u8840\u6db2\u578b /* Ketsuekigata */[3];
    char \u6027\u5225/* Seibetsu */[10];
    char \u661f\u5360\u3044/* Hoshi uranai*/[10];
    int \u5e74\u9f62/* Nenrei */;
};

int main(void) {
    struct \u5fcd\u3073 Uchiha_Itachi;
    Uchiha_Itachi.\u5e74\u9f62 = 21;
    printf("the age of itachi > %d", Uchiha_Itachi.\u5e74\u9f62);
}

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Note: using defines like below, are not specified to work either. Support for such is implementation defined.

// not certain to work
#define 忍び \u5fcd\u3073 

If a strong need exists to "any way to fix this?", write your source code as a .wheldrake file and translate it to standard .c one.

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Soapbox

One character I would like to use: ≠, the not_equal sign.

Answer 2

It's not possible, at least there's no portable way (some compilers may allow it nonetheless, while others won't). According to this:

An Identifier can only have alphanumeric characters(a-z , A-Z , 0-9) and underscore(_).

It might however work using macros. To try that, add this line before you first use "忍び":

#define 忍び Shinobi

However, I wouldn't recommend it. It also isn't portable and some compilers might allow certain symbols while others won't.