/* Shao Miller - 2012-Oct-13 */

  #include <stdio.h>

  int main(void) {
      register unsigned char shift;
      register unsigned char * pos;
      unsigned char stream[] = { 1, 2, 3, 4 };
      register unsigned char * end;

      printf("Lowest-bit first: ");

      for (
          (shift = 1), (pos = stream), (end = stream + sizeof stream);
          pos < end;
          (shift <<= 1) ? 0 : (pos += ++shift)
        ) {
          printf((shift & *pos) ? "1" : "0");
        }

      printf("\n");

      printf("Lowest-bit first: ");

      shift = 1;
      pos = stream;
      end = stream + sizeof stream;
      while (pos < end) {
          printf((shift & *pos) ? "1" : "0");
          if (!(shift <<= 1))
            pos += ++shift;
        }

      printf("\n");

      return 0;
    }