// 语法制导翻译器设计示范程序

// ----- 算数表达式四元式翻译(递归子程序法)

// 要求：1. 读懂该程序，并上机调试成功；

// 2. 运行该程序，输入源表达式（字母：表示变量，数字：表示常数。）

// 3. 反复运行，考查输出的各种四元式的正确性。

// 4. 实验报告内容：表达式的属性翻译文法；递归子程序框图；

// 运行结果的记录（输出的三元式不得少于10条！）

-/ / syntax translation guided design model procedures / / ----- count expressions four yuan-translation (recursive son Procedure Act) / / : 1. to understand the procedures and Machine success; / / 2. to run the program. input source expression (in alphabetical : Variables said, the figure : Constant said.) / / 3. repeated running, examine the output of the four yuan-correctness. / / 4. Experimental contents of the report : Expressions of attribute grammar translation; Recursive subroutine diagram; / / operating results of the records (3-output should not be less than 10!)