FOR循环语句的翻译程序设计（简单优先法、输出四元式），写出符合给定的语法分析方法的文法及属性文法。

完成题目要求的中间代码四元式的描述。

写出给定的语法分析方法的思想，完成语法分析和语义分析程序设计。

编制好分析程序后，设计若干用例，上机测试并通过所设计的分析程序。-FOR loop of the translation process design (a simple priority method, the output quaternion type), written in line with the given grammar syntax analysis and attribute grammar. Subject completed the requirements of intermediate code descr iption of quaternion type. Write a given the idea of syntax analysis, syntax analysis and semantic completion of analysis of program design. After the preparation of a good analysis, design a number of use cases, test the design through the analysis procedure.