实验二：TINY扩充语言的语法分析





扩充的语法规则有：实现 while、do while、for语句和求余计算式子，具体文法规则自行构造。

可参考：P97及P136的文法规则。



(1) While-stmt --> while exp do stmt-sequence endwhile

(2) Dowhile-stmt-->do stmt-sequence while exp

(3) for-stmt-->for identifier:=simple-exp to simple-exp do stmt-sequence enddo 步长递增1

(4) for-stmt-->for identifier:=simple-exp downto simple-exp do stmt-sequence enddo 步长递减1



可由用户选择是否生成语法树，并可查看所生成的语法树。-Experiment II: TINY extension language syntax analysis of the expansion of grammar rules: to achieve the while, do while, for statement and the remainder calculation formulas, specific grammar rules to construct their own. Reference: P97 and P136 grammar rules. (1) While-stmt->　while exp do stmt-sequence endwhile (2) Dowhile-stmt->　do stmt-sequence while exp (3) for-stmt->　for identifier: = simple-exp to simple- exp do stmt-sequence enddo increments of 1 (4) for-stmt->　for identifier: = simple-exp downto simple-exp do stmt-sequence enddo variety step decrement by the user to choose whether to generate a syntax tree, and view generated syntax tree.