These macros will let you use binary constants straight in your code. C normally only allows you to use base 8, 10, and 16. Base 2 is extreamely useful when you're dealing with individual bits in a bitfield.
Code:
Usage:
#include "binconst.h"
unsigned char bitfield = B8(01010101); // 85
unsigned int bigbitfield = B32(10000000,11111111,10101010,01010101); // 2164238933
Extensions:
If you needed, it would be pretty trivial to create a 64 bit binary macro as well. I'll leave that as an exercise for the reader.