（1）如果用循环链表表示一元多项式，试编写一个函数 Calc(x)，计算多项式在x处的值。

（2）设a和b是两个用带有表头结点的循环链表表示的多项式。试编写一个算法，计算这两个多项式的乘积c = a*b，要求计算后多项式a与b保持原状。

-( 1) if the circular linked list representation of a polynomial, try to write a function Calc ( x ), a polynomial in x value at.



( 2) let a and B be two with the header node circular linked list representation of polynomials. Try to write an algorithm, computing the two polynomial multiplication C = a* B, a and b polynomial computation requirement to maintain the status quo.