I don't what's wrong with this but the result is always 0.0
#include "poly.h"
#include <math.h>
/*
* polyEval: Evaluates p(x) = a[0] + a[1] * x + ... + a[n] * x^n.
* Pre: n >= 0 and array a[] has at least n+1 elements.
*/
double polyEval(double *a, int n, double x)
{
int i; /* counter for the array */
double sum=0.0;
for (i=0; i<=n; i++){
sum+= a[i]*pow(x,i);}
return sum;
}
/*
* sinePoly: Evaluates sin(x) using the first numTerms (nonzero) terms of
* its infinite series.
* Pre: 1 <= numTerms <= MAXTERMS.
*/
double sinePoly(double x, int numTerms)
{
double a[MAXTERMS];
while (numTerms >= 0){
a[numTerms]=*blah calculations*;
numTerms--;
}
return polyEval(a, numTerms, x);
}