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废话不多说，直接上代码

#include <stdio.h>
#include <stdlib.h>#define foreach_http_error				\_ (401, "401 error")					\_ (501, "501 error")typedef enum
{
#define _(sym,string) HTTP_ERROR_##sym,foreach_http_error
#undef _HTTP_N_ERROR,
} http_reply_error_t;static char *http_error_strings[] = {
#define _(sym,string) string,foreach_http_error
#undef _
};const char *get_error(const int code) {return http_error_strings[code];
}int main() {const char *err = get_error(HTTP_ERROR_401);printf("err string: %s\n", err);getchar();return 0;
}