#include <stdio.h>

struct a {
    int x,y;
    unsigned int a:1, b:1, c:1, d:1;
};

unsigned char conv(unsigned char byte) {
//	    unsigned char byte = in;
            return  (byte >> 7) & 1
		             | (byte >> 5) & 2
			     | (byte >> 3) & 4
			     | (byte >> 1) & 8
			     | (byte << 1) & 16
			     | (byte << 3) & 32
			     | (byte << 5) & 64
			     | (byte << 7) & 128;
}

int main() {
    struct a a;
    int i;
    char *x;
    memset(&a, 0, sizeof(struct a));
    a.a = 0;
    a.b = 1;
    a.c = 0;
    a.d = 0;
    
    x = (char*)&a;
    for(i=0; i<sizeof(struct a); i++) {
	int j;
	printf("%3d: %3hhd (%3hhd) ", i, x[i], conv(x[i]));
	for(j=0; j<sizeof(char) * 8; j++)
	    printf("%d", (x[i] >> j) & 1);
	printf("\n");
    }
}