| 注意 | 在end后不需要再加分号,因为begin_end内是一个完整的复合语句,不需再附加分号。 |
| case | 0 | 1 | x | z |
| 0 | 1 | 0 | 0 | 0 |
| 1 | 0 | 1 | 0 | 0 |
| x | 0 | 0 | 1 | 0 |
| z | 0 | 0 | 0 | 1 |
| casez | 0 | 1 | x | z |
| 0 | 1 | 0 | 0 | 1 |
| 1 | 0 | 1 | 0 | 1 |
| x | 0 | 0 | 1 | 1 |
| z | 1 | 1 | 1 | 1 |
| casex | 0 | 1 | x | z |
| 0 | 1 | 0 | 1 | 1 |
| 1 | 0 | 1 | 1 | 1 |
| x | 1 | 1 | 1 | 1 |
| z | 1 | 1 | 1 | 1 |
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