Well I'm having quite a bit of errors with my code and have tried figuring out how to fix it, but I can't seem to figure out what is wrong. Here are the errors

1>------ Build started: Project: circle, Configuration: Debug Win32 ------

1>Compiling...

1>circle.cpp

1>c:usersemcydocumentsvisual studio 2008projectscirclecirclecircle.cpp(38) : error C2064: term does not evaluate to a function taking 4 arguments

1>c:usersemcydocumentsvisual studio 2008projectscirclecirclecircle.cpp(39) : error C2064: term does not evaluate to a function taking 1 arguments

1>c:usersemcydocumentsvisual studio 2008projectscirclecirclecircle.cpp(40) : error C2064: term does not evaluate to a function taking 1 arguments

1>c:usersemcydocumentsvisual studio 2008projectscirclecirclecircle.cpp(41) : error C2064: term does not evaluate to a function taking 1 arguments

1>c:usersemcydocumentsvisual studio 2008projectscirclecirclecircle.cpp(64) : error C2659: '=' : function as left operand

1>c:usersemcydocumentsvisual studio 2008projectscirclecirclecircle.cpp(66) : error C2440: 'return' : cannot convert from 'double (__cdecl *)(double)' to 'double'

1>There is no context in which this conversion is possible

1>c:usersemcydocumentsvisual studio 2008projectscirclecirclecircle.cpp(71) : error C2659: '=' : function as left operand

1>c:usersemcydocumentsvisual studio 2008projectscirclecirclecircle.cpp(73) : error C2440: 'return' : cannot convert from 'double (__cdecl *)(double)' to 'double'

1>There is no context in which this conversion is possible

1>c:usersemcydocumentsvisual studio 2008projectscirclecirclecircle.cpp(81) : error C2659: '=' : function as left operand

1>c:usersemcydocumentsvisual studio 2008projectscirclecirclecircle.cpp(81) : error C2143: syntax error : missing ';' before 'return'

1>c:usersemcydocumentsvisual studio 2008projectscirclecirclecircle.cpp(81) : error C2440: 'return' : cannot convert from 'double (__cdecl *)(double)' to 'double'

1>There is no context in which this conversion is possible

1>Build log was saved at "file://c:UsersEmcyDocumentsVisual Studio 2008ProjectscirclecircleDebugBuildLog.htm"

1>circle - 11 error(s), 0 warning(s)

========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

And here is the code:

```
#include <iostream>
#include <cmath>
using namespace std;
double radius(double x, double y, double xs, double ys);
double diameter(double x);
double circumference(double x);
double area(double x);
const double pi = 3.141;
int main()
{
double centerX;
double centerY;
double pointX;
double pointY;
double radius;
double diameter;
double circumference;
double area;
cout << "This program will calculate the radius, diameter, circumference and area n of a circle if the user gives the locaction of the center point and n a point on the circle."<< endl;
system("pause");
system("cls");
cout << "Enter the x coordinate for the center of the circle. n" << endl;
cin >> centerX;
cout << "Enter the y coordinate for the center of the circle. n" << endl;
cin >> centerY;
cout << "Now enter the x coordinate for any point on the circle. n" << endl;
cin >> pointX;
cout << "Now enter the y coordinate for any point on the circle. n" << endl;
cin >> pointY;
radius = radius(centerX, centerY, pointX, pointY);
diameter = diameter(radius);
circumference = circumference(radius);
area = area(radius);
cout << "The radius of the circle is " << radius << endl;
cout << "The diameter of the circle is " << diameter << endl;
cout << "The circumference of the circle is " << circumference << endl;
cout << "The area of the circle is " << area << endl;
return 0;
}
double radius(double x, double y, double xs, double ys)
{
double radius;
radius = sqrt(pow((x-xs),2) + pow((y-ys),2));
return radius;
}
double diameter(double x)
{
diameter = x * 2;
return diameter;
}
double circumference(double x)
{
circumference = 2 * pi * x;
return circumference;
}
double area(double x)
{
area = pi * pow(x,2)
return area;
}
```