C/C++开发的编译原理相关程序：IF-ELSE条件语句的翻译程序设计；利用LL(1)文法，对以文件形式输入的if条件语句进行词法、语法及语义分析，并最终得到以四元式形式表示的中间代码，要求将词法及语法分析结果以文件形式输出。-Compiler principles related procedures: translation program designed IF-ELSE conditional statement　use LL (1) grammar, for if conditional statements in the file format input lexical, syntax and semantic analysis, and, ultimately, to obtain an intermediate quaternion formula expressed in the form code requires lexical and grammatical analysis results as a file output.