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Bit Fields (cont)

Warnings when using bit-fields:
  • Little endian and big endian systems will lay out the bits in different ways. This can result in non-portable code in some situations
  • You can't have a pointer to a bit-field member as they may not start on a byte boundary

Eg The following won't compile 

int main(void) {
   printf("%p\n", &(d.day));
   return 0;
}