用于创建多项式并以符合我们习惯的方式显示。还提供了多项式相加的功能-it create a polynomail and display it in the way that satisfy our habite.additonally it provide the function to add two polynomails
BMP存入xml文件中,同时也可以读出。包含两个实例,非常感谢另一个位作者。-BMP deposited xml document, but can also read out. Contains two examples, I would like to thank the other writers.