此为编译原理课程设计——FOR循环语句（简单优先法、输出三地址表示）。可以实现词法分析、语法分析、语义分析，能生成中间代码。功能比较全。-This is the principle of curriculum design compiler- FOR loop (simple priority method, the output address of said three). Can achieve lexical analysis, syntax analysis, semantic analysis, intermediate code can be generated. Comparison of the whole function.