#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <assert.h>
#include "clog.h"

// Q:  n.value.as_int is ugly!!!  Why can't I just say n.as_int?
// A:  Yes, you can.  Use an anonymous union in the struct.  Just omit the name
//     of the union in the struct definition.


struct Number {
    union {
        int as_int;
        double as_double;
    };  // OMIT NAME to make an anonymous union inside the struct.  (C11)

    // } value;

    enum NumberType {
        NUMBER_INT,    // 0
        NUMBER_DOUBLE  // 1
    } type;  // field name is here <<<<<<
};

void print_number_value(struct Number n) {
    if(n.type == NUMBER_INT) {
        printf("%d\n", n.as_int);
        //printf("%d\n", n.value.as_int);
    }
    else if(n.type == NUMBER_DOUBLE) {
        printf("%f\n", n.as_double);
        //printf("%f\n", n.value.as_double);
    }
}

int main(int argc, char* argv[]) {

    printf("Declare and initialize n to 5 (as an int).\n");
    // union NumberValue n = { .as_int = 5 };
    // enum NumberType type_of_n = NUMBER_INT;
    struct Number n = { .as_int = 5, .type = NUMBER_INT };

//  print_number_value(n, type_of_n);
    print_number_value(n);

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