1 files changed, 46 insertions, 0 deletions
diff --git a/C/HF/chap5/data.c b/C/HF/chap5/data.c
new file mode 100644
index 0000000..4034480
--- /dev/null
+++ b/C/HF/chap5/data.c
@@ -0,0 +1,46 @@
+#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;
+}