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

// BAD WAY #1:  use raw integers to indicate type.  TERRIBLE!!!

union Value {
    int   as_int;
    char* as_string;
};
// A union object can contain only one of the fields; they share the same space.

void print_element(union Value the_value, int type_of_value) {
    if(type_of_value == 0) {  // We cannot know type in the_value without another parameter.
        printf("the_value is %d\n", the_value.as_int);
    }
    else {
        printf("the_value is %s\n", the_value.as_string);
    }
}

int main(int argc, char* argv[]) {
    union Value the_value = { .as_int = 5 };
    the_value.as_int = 7;
    print_element(the_value, 0);  // 0 means it's an int   (TERRIBLE)

    the_value.as_string = "apple";
    print_element(the_value, 1);  // 1 means it's a string (TERRIBLE)
    
    return EXIT_SUCCESS;
}
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