Thread: Im stuck....

I cannot get this program to return any values at all what am I doing wrong please help and thank you for visitng my post...

Code:

#include <iostream.h>
#include <cmath>


double CalculateDist(float, float, float, float);			//Function prototypes
double CalculateRadius(float, float, float, float);
double CalculateCircum(double, double);
double CalculateArea(double, double);
const double Pi = 3.1416;

int main()
{
	float x1 = 0;    // Variables
	float x2 = 0;
	float y1 = 0;
	float y2 = 0;
	float dis = 0;
	float rad = 0;
	float cir = 0;
	float are = 0;

	
	

	cout << "Please enter the x coordinate for the center point " << endl;
	cin >> x1;
	cout << "Please enter the y coordinate for the center point " << endl;
	cin >> y1;
	cout << "Please enter the x coordinate for a point on the circle " << endl;
	cin >> x2;
	cout << "Please enter the y coordinate for a point on the circle " << endl;
	cin >> y2;


	cout << "The distance between the points is " << CalculateDist(x1,x2,y1,y2) << endl;
	cout << "The radius of the circle is        " << CalculateRadius(x1,x2,y1,y2) << endl;
	cout << "The circumfrence of the circle is  " << CalculateCircum(Pi,rad) << endl;
	cout << "The area of the circle is          " << CalculateArea(Pi, rad) << endl;
	
		return 0;
}

//=====================================================================================================================
// Functions

double CalculateDist(float x1, float x2, float y1, float y2)
{		
	return sqrt(pow(x1 - x2, 2) + pow(y1 - y2, 2));
	
}

double CalculateRadius(float x1, float x2, float y1, float y2)
{
	return	CalculateRadius(x1, x2, y1, y2);

}

double CalculateCircum(double Pi, double rad)
{
	return (2* Pi * rad);
}

double CalculateArea(double Pie, double rad)
{
	return (Pi * pow(rad, 2));
}