编译原理实验：词法分析，选择对各种常见高级程序设计语言都较为通用的语法结构无符号数的算术四则运算作为分析对象，给出其文法描述（注意应与所采用的语法分析方法比较贴近），设计并实现一个完整的语法分析程序。规则：E->E+T| E-T|T

T->T*F| T/F|F

F->(E)|i

-Compiler principle experiment: lexical analysis, the choice of a variety of common high-level programming languages ​ ​ are more common grammatical structure unsigned arithmetic arithmetic as the analysis target, given its grammatical descr iption (Note that the syntax analysis methods should be used in relatively close ), to design and implement a complete parser. Rules: E->　E+T | ET | T T->　T* F | T/F | F F->　(E) | i