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[gdjs]

I was rummaging through some old code of mine when I found this routine for determining a polynom's value given its degree, coeficients and a value for x (the variable). I hope it's useful to anyone:

// http://guipn.com/blog


#include <stdlib.h>

#include <stdio.h>

#include <math.h>


double evalpolynom(double x, unsigned degree, double *coefs)

{

	double result = 0;

	unsigned index;


	for (index = 0; index <= degree; index++)

		result += coefs[index] * pow(x, index);


	return result;

}


int main(void)

{

	double *pol = (double []) {50, -1, 2}; // 50 -x + 2x^2

	printf("f(8) = 180: %f\n", evalpolynom(8, 2, pol));

	return 0;

}