#include <stdio.h>

int main() {
	union {
		unsigned short value;
		unsigned char byte[2];
		struct {
			unsigned short one   : 1;
			unsigned short two   : 2;
			unsigned short three : 3;
			unsigned short four  : 4;
			unsigned short five  : 5;
		} field;
	} u;

	u.field.one   = 1;
	u.field.two   = 2;
	u.field.three = 3;
	u.field.four  = 4;
	u.field.five  = 5;

	printf("The fields are 1, 2, 3, 4, 5.\n");
	printf("The entire hex value is 0x%04x\n", u.value);
	printf("The first byte is 0x%02x\n", u.byte[0]);
	printf("The second byte is 0x%02x\n", u.byte[1]);

	return 0;
}