对已给语言文法，利用递归子程序法，编制语法分析程序，要求将错误信息输出到语法错误文件中，建立符号表和输出语法树。-Have been addressed to the language grammar, the use of recursive subroutine method, the preparation of grammar analysis program, requested that error message output to a syntax error document, the establishment of the output symbol table and syntax tree.