// File Prologue
// CS 1400-X01
// Sara Payne
// Lab #3
// Aug 30, 2011


// I delcare that the following source code was written by me, or provided
// by the instructor for this project. I understand that copying
// source code from any other source constitutes cheating, and that I will
// reveive a zero grade on this project if I am found in violation of
// this policy.



using System;

class Program

{
    static void Main ()
    {
        // Declare pi as a const variable
        const double PI = 3.14159;
        // Declare Diamater product
        const int DIAMATER_PORDUCT = 2;
        // Declare Variables to hold data for radius, area, diamater, circumference, unused space
        double area, radius, diamater, area_of_circle, unused_Space;
        // Tell user that we are finding the unused space between crops which is the area within the square
        // but outside the circles.
        Console.WriteLine("This program finds the empty space that is not used within the cirlce of crops");
        // Prompt user what the radius of one circle is
        Console.Write("Please enter the radius of the one crop circle: ");
        // Get radius typed by user and save it in a variable named radius
        radius = double.Parse(Console.ReadLine());
        // Find the diamater of circle by radius * 2 (or diamater product)
        // Save diamater as variable diamater
        diamater = (radius * DIAMATER_PORDUCT);
        // Use the radius of the circle to compute the area of the circle (PI* radius^2)
        area_of_circle = (PI * radius * radius);
        // Find area of the square in bariable name area
        area = diamater * diamater;
        // Save area of square in variable name area
        // Find unused space by area - area_of_circle
        unused_Space = area - area_of_circle;
        // Save unused space answer in variable unused_Space 31.4
        // Print unused_Space
        Console.WriteLine ("This is the unused space between crops {0}",unused_Space);
        Console.ReadLine ();
    }
}