So I am working a a project for my intro C++ class, and I am having some trouble with a function for approximating exp(x) using a taylor series. The taylor series approximations for exp(x) is: 1+x+((x^2)/2!)+((x^3)/3!+...., and I am supposed to approximate to "n" number of terms.
double fact(int c)
{
int factorial=1;
for ( int i = 1; i <= c; i++ )
{
factorial *=i;
}
return factorial;
}
double taylor(double x, int n)
{
double approx;
double sum;
double value;
for (int i=1; i<=n; i++)
{
int factorial=1;
factorial*=i;
sum=((pow(x,i))/fact(i));
value+=sum;
}
approx = 1+value;
return approx;
Now this does work if I just run it by itself, i.e. just do something like "cout << taylor(x,n)". But whenever I call this function within another function, it does not work! It is kinda hard to explain, but anyone have any ideas?