#!/usr/local/bin/tcc -run
void main(void)
{
    int i;
    unsigned char d[] = {0x66, 0x55, 0x66, 0x55};
    for(i = 0; i < 8; i++) {
        printf("%d\n", d[i / 2] >> ( ( i % 2 ) * 4 + 0 ) & 0x03);
        printf("%d\n", d[i / 2] >> ( ( i % 2 ) * 4 + 2 ) & 0x03);
    }
    printf("%d\n", (0 % 2) * 4 + 2);
}