编译原理的课程设计。题目为“WHILE循环语句的翻译程序设计（LL（1）法、输出四元式）”。创新之处在于，可以翻译多层循环语句（理论上是无限的，示例为4层while循环语句）-Compiler theory of curriculum design. Entitled " the WHILE loop statement translation program design (LL (1) method, output quaternion type). The innovation lies in the translation the multilayer cycle statement (theoretically infinite, the example layer while loop)