下标 | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
低4位=0 | 0 | 5 | 6 | 5 | 7 | 5 | 6 | 5 |
低4位!=0 | 0 | 1 | 2 | 1 | 3 | 1 | 2 | 1 |