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

typedef union { // ON OUR PLATFORM
    int    as_int;    // 4 bytes
    float  as_float;  // 4 bytes
    double as_double; // 8 bytes (?)
    char*  as_string; // 8 bytes
} Number;            // 8 bytes because for union, size is the maximum
                     //         of the size of each field.

#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))

int main(int argc, char* argv[]) {
    Number n1 = { .as_int = 8 };
    log_int(n1.as_int);

    Number n2 = { .as_float = 0.125 };
    log_float(n2.as_float);

    Number n3 = { .as_double = 0.125 };
    log_double(n3.as_double);

    Number n4 = { .as_string = "8 billion" };
    log_str(n4.as_string);

    return EXIT_SUCCESS;
}
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