Open Access
表12
表达式计算规则
| 节点类型 | 操作 |
| 具体层变量 | 从测试用例中读取数据, 对具体层变量赋值 |
| 具体层操作符 | 根据节点类型, 结合2个子树的值进行计算 |
| 抽象层变量 | 用子节点值对本节点赋值, 若结点为否定表达, 则将结果取“非” |
| 抽象层操作符 | 根据节点类型, 结合2个子树的值进行计算 |
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.