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

union IntOrString {
    int as_int;
    char* as_string;
};  // SEMICOLON!!!!

// Declare an enum type 'WhichType' that can be either TYPE_INT or TYPE_STRING.
enum WhichType {
    TYPE_INT,    // == 0
    TYPE_STRING  // == 1
};  // SEMICOLON
// Internally, this will be stored as an int, but using an enum type makes it clear that variables
// of that type are flags that specify which (of a few choices) something is.

typedef struct {
    union IntOrString value;
    enum WhichType type;
} IntOrStringWithType;

void print_number_as_int_or_string(IntOrStringWithType number_as_int_or_string) {
    if(number_as_int_or_string.type == TYPE_INT) {
        printf("number_as_int_or_string is an int: %d\n", number_as_int_or_string.value.as_int);
    }
    else if(number_as_int_or_string.type == TYPE_STRING) {
        printf("number_as_int_or_string is a string: %s\n", number_as_int_or_string.value.as_string);
    }
}

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

    IntOrStringWithType five = { .value.as_int = 5,  .type = TYPE_INT };

    print_number_as_int_or_string(five);

    five.value.as_string = "cinco";
    five.type = TYPE_STRING;
    print_number_as_int_or_string(five);

    return EXIT_SUCCESS;
}
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