struct poly {
	int n; //degree
	double a; // coefficient
	struct poly *p; // pointer to next term
};

struct poly *polyCreate();
struct poly *polyDelete(struct poly *p);
struct poly *polySetCoefficient(struct poly *p, int degree, double value);
double polyGetCoefficient(struct poly *p, int degree);
double polyEval(struct poly *p, double x);