(1)编制一个中间代码生成程序，能将算术表达式（如带有嵌套括号）等翻译成四元组。 (2)程序具有通用性，即能接受各种不同的算术表达式等语法成分。 (3)有运行实例．对于语法正确的算术表达式，能生成四元组序列，并输出结果；对不正确的表达式，能检测出错误。 (4)提交实习报告-(1) the preparation of an intermediate code generation process, can the arithmetic expression (such as with nested parentheses), etc. translated into quad. (2) The program has the versatility that can accept a variety of arithmetic expressions and other grammatical elements. (3) the running instance. For the syntactically correct arithmetic expression can produce four-sequence, and output results　on the incorrect expression, can detect errors. (4) to the internship report