int reverseBit(int b){ b = (b & 0xF0) >> 4 | (b & 0x0F) << 4; printf("b=[%x]\n", b); b = (b & 0xCC) >> 2 | (b & 0x33) << 2; printf("b=[%x]\n", b); b = (b & 0xAA) >> 1 | (b & 0x55) << 1; printf("b=[%x]\n", b); return b; }