#include <stdio.h>

enum q {
	COUNT,
	WEIGHT,
	VOLUME,
};

/* Using anonymous data structures is awesome */
struct item {
	char *desc;
	union {
		long int count;
		float weight;
		float volume;
	};
	enum q type;
}__attribute((packed))__;

int main(void) {

	struct item fruit =
	{
		.desc = "apple",
	};

	fruit.type = WEIGHT;

	if (fruit.type == COUNT) {
		fruit.weight = 3.87;
		printf("Fruit = %s is %ld\n", fruit.desc, fruit.count);
	}
	if (fruit.type == WEIGHT) {
		fruit.weight = 69.5;
		printf("Fruit = %s is %2.2f\n", fruit.desc, fruit.weight);
	}
	if (fruit.type == VOLUME) {
		fruit.volume = 63.5;
		printf("Fruit = %s is %2.2f\n", fruit.desc, fruit.volume);
	}

	printf("struct item: %lu - count: %lu - weight: %lu - volume: %lu - type: %lu\n",
	       sizeof(struct item), sizeof(fruit.count), sizeof(fruit.weight),
	       sizeof(fruit.volume), sizeof(fruit.type));
	return 0;
}