实验内容：

设计一个一元多项式的简单计算器，其基本功能有：①输入并建立多项式；②输出多项式；③多项式相加；④多项式相减；⑤多项式的乘积（选作）。可利用单链表或单循环表实现。-Experiment content: the design of a one dollar a simple polynomial calculator, and its basic functions: ① the importation and the establishment of polynomials　② output polynomial　③ polynomial sum　④ subtract polynomials　⑤ number type of product (selected for). Can make use of single-list or the realization of the single round-robin table.