编译原理课程实验：将简单中缀算术表达式变换成：（1）后缀形式；（2）生成书上描述的抽象堆栈机的代码；（3）对常量算术表达式，输出结果 -Compiler theory course experiment: a simple infix arithmetic expressions transform into: (1) suffix form (2) generate an abstract descr iption of the book stack machine code (3)