Description: (1) according to the given grammar, first find the FirstVt and LastVt collection of operator precedence relationship table structure (which requires operator precedence relationship table to the screen or output to a file) (2) According to the algorithm and the priority of a given relational table identify whether the expression is the grammar correct arithmetic expression (requires output reduction process) (3) test requirements independently, does not allow copying phenomenon. (4) experiment is completed, and turned over requested source test report (including the source list).
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