xor.c

#include <inttypes.h>
#include <stdio.h>
#include <assert.h>

int main() {
    uint8_t F[] = { 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80 };

    for (uint8_t i = 0; i < 0xFF; ++i) {
        for (uint8_t q = 0; q < 8; ++q) {
            if ((i & F[q]) > 1) {
                assert((i ^ F[q]) == (i & ~F[q]));
            }
        }
    }
    
    return 0;
}