#include <stdio.h>

struct fields {
	char a:1;
	char b:1;
	char c:1;
	char d:2;
	char e:1;
};

int main(int argc, char **argv) {
  char buffer[9];
  struct fields f;

  f.a = 1;
  f.b = 0;
  f.c = 1;
  f.d = 1;
  f.e = 1;

  // no base-2 format spec in printf
  for(int i = 0; i < 9; i++)
    buffer[i] = (*((char*)&f) << i) & 0b10000000 ? '1' : '0';

  printf("sizeof(f):    %d\n",   sizeof(f));
  printf("f as char:    %c\n",   *((char*)&f));
  printf("f in base-2:  %s\n",     buffer);

  return 0;
}