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

// Q: Passing around two variables for one "thing" (the number) is cumbersome.
//    Can we do this with just one variable?
// A: Answer to this type of question is usually a struct type. ... and yes, you can.

// Define union type 'NumberValue'
union NumberValue {
    int as_int;
    double as_double;
};  // <<<< SEMICOLON <<<<

enum NumberType {
    NUMBER_INT,    // 0
    NUMBER_DOUBLE  // 1
};

struct Number {
    union NumberValue value;
    enum  NumberType  type;
};

void print_number_value(struct Number n) {
    if(n.type == NUMBER_INT) {
        printf("%d\n", n.value.as_int);
    }
    else if(n.type == NUMBER_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 = { .value.as_int = 5, .type = NUMBER_INT };

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

    return EXIT_SUCCESS;
}
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