How to declare different size variables

Question

Hi I want to declare a 12 bit variable in C or any "unconventional" size variable (a variable that is not in the order of 2^n). how would I do that. I looked everywhere and I couldn't find anything. If that is not possible how would you go about saving certain data in its own variable.

Answer 1

Use a bitfield:

struct {
   unsigned int twelve_bits: 12;
} wrapper;