C++ Code Help: Wont Compile - Most likelty function prototype

#include

#include

#include

using namespace std;

const double pi = 3.14;

void calculate (double, double, double, double); //Function Prototype

int main()

{

double r;

double h;

double surfacearea = 0;

double volume = 0;

cout << "Please enter the radius of the cone" << endl;

cin >> r;

while (r < 0)

{

cout << "You entered a radius of " << r << endl;

cout << "Please enter a positive value for the radius" << endl;

cin >> r;

}

cout << "Please enter the height of the cone" << endl;

cin >> h;

while (h < 0)

{

cout << "You entered a height of " << h << endl;

cout << "Please enter a positive value for the height" << endl;

cin >> h;

}

calculate(r, h, &surfacearea, &volume);

cout << "A cone with radius of " << r << " and a height of " << h << endl;

cout << "has a volume of " << volume << endl;

cout << " and a surface are of " << surfacearea << endl;

system("pause");

return 0;

}

void calculate(double radius, double height, double surfacearea, double volume)

{

surfacearea = pi * radius * (radius + sqrt(radius * radius + height * height));

volume = (1.0 / 3) * pi * radius * radius * height;

}