本程序为javacc程序，在eclipse下运行时要安装javacc插件。本程序是个编译程序的一小部分内容，属于语法分析，实现了while语句、if语言的翻译。-The procedure for the javacc program, when running in eclipse plug-ins to install javacc. This program is a compiler of a small part, is syntax analysis, to achieve a wh