Bit Fields and Unions

example.c

#include <stdio.h>

typedef struct a
{
	unsigned short q : 4;
	unsigned short w : 2;
	unsigned short e : 4;
	unsigned short r : 6;
}A;

typedef struct b
{
	unsigned short q : 4;
	unsigned short w : 3;
	unsigned short e : 5;
	unsigned short r : 4;
}B;

typedef union test
{
	B second;
	A first;
}testU;

int main()
{
	testU n;
	n.second.e = 25;
	n.second.q = 11;
	n.second.w = 5;
	n.second.r = 13;

	printf("%d %d %d %d\n",n.first.q,n.first.w,n.first.e,n.first.r);
	printf("%d %d %d %d\n",n.second.q,n.second.w,n.second.e,n.second.r);

	return 0;
}