#include <stdio.h>
#include <stdlib.h>

#define log_int(x) printf("%s == %d\n", #x, (x))
#define log_float(x) printf("%s == %.060f\n", #x, (x))
#define log_double(x) printf("%s == %.060lf\n", #x, (x))
#define log_str(x) printf("%s == \"%s\"\n", #x, (x))

typedef struct {
    union {
        int    as_int;
        float  as_float;
    } number;
    enum { NUMBER_INT = 1, NUMBER_FLOAT } type;
} Number;

int main(int argc, char* argv[]) {
    Number n1 = { .as_int   = 8    , .type = NUMBER_INT };
    if(n1.type == NUMBER_INT) {
        printf("%d\n", n1.number.as_int);
    }

    return EXIT_SUCCESS;
}
/* vim: set tabstop=4 shiftwidth=4 fileencoding=utf-8 noexpandtab: */