Thread: SImpson's Rule

Hey guys, my instructions are to create a program that approximates the area using Simpson's Rule. I set it up the way my book shows, however it is giving me the following error message:
'function' cannot convert from 'double *' to 'double'
and
a warning that says: different types for formal and actual parameter 1

What do these mean?

Here is the part of the code that it applies to:

Code:

double f(double *ptr, double x, int degree)
{
	double sum = 0;
	int i;
	
		for(i = 0; i <= degree; i++)
		{	
			sum = sum + ptr[i] * pow(x,i);
			return(sum);

		}


}

double rectangular(double *ptr, double a, double b, double n,int degree)
{
		double area = 0;
		double totarea = 0;
		double k = 0;
		double width = (b - a) / n;
		double widthplus = (b - a) / n;
		double height = 0;

		for(k = n; k > 0; k--)
		{
				for(degree = degree; degree >= 0; degree--)
				{
					if(degree != 0)
					{
						height = height + (pow(ptr[degree],degree));
					}
					else
					{
						height = height + (ptr[degree]);
					}

				}

				area = height * width;
				totarea = totarea + area;
				widthplus = widthplus + width;

		}
		return(totarea);
	}

double simpsons(double *ptr, double a, double b, double n, int degree)
{
		
	double answer = 0;
	double h;
	double x;
	int i;

		h = (b - a) / n;

		answer = f(ptr,a,degree);
			
			for(i = 1; i <= n; i++)
			{
				x = a + i*h;
				
				answer = answer + 4 * f(ptr,x - (h/2),degree) + 2 * f(ptr,x,degree);
				
			}

			answer = answer - f(ptr,b,degree);

			return(h*answer/6);


			

}

Thanks for the help.