#include <stdio.h>

struct {
	unsigned int is_keyword : 1;
	unsigned int is_extern: 1;
	unsigned int is_static: 1;
} flags;

int main ()
{
	printf ("sizeof: %d\n", sizeof flags);
	printf ("%d\n", flags);
	flags.is_keyword = 1;
	printf ("%d\n", flags);
	return 0;
}