// finish this program that asks the user
// to enter the diameter of a circle and then
// calculates and outputs the area of the circle.

// hint: area = (pi/4) x diameter^2


#include <iostream>
using namespace std;

int main()
{

	const double PI = 3.14159;

	double diameter;
	double area;

	cout << "Please enter the diameter of your circle : ";
	
	// write your code here


	



	cout << "The area of the circle is " << area << endl;
			

	return 0;
}