/***************************************************************************\
	Efficient Evaluation of Polynomials
		
	Author : Greg Young, Z-World.

	The need to compute polynomials occurs commonly in numeric applications.
	Rather than performing these long hand, the library function poly uses
	Horner's Method to compute the value as efficiently as possible. In the
	below example, the polynomial (as written explicitly in C) would be

			fX*fX*fX*fX - fX*fX*fX + 2*fX + 1.0
\***************************************************************************/

float				arC[] = { 1.0,2.0,0.0,-1.0,1.0 };

void
main				(	void
					)

{	float		fX;

		for (fX=-3.0;fX<=3.0;fX+=1.0)
			printf ( "%f %f\n",fX,poly(fX,4,arC) );
}