int mask = 0xFF << 8;
mask = (mask << 8) + mask;
mask = (mask << 16) + mask;
mask = ~(mask << n);
int temp = mask & x;
temp = temp << (33 + ~n);
int shift = x >> n;
int zero_mask = 1 << (33 + ~n);
shift = shift & zero_mask;
return temp ^ shift;