import java.util.Random;

public class lab8
{
	public static void main(String[] args)
	{

		final int POINT = 2;
		int x = 0, y = 0;
		int miss = 0, hit = 0;
		double est = 0;

		ConsoleReader cin = new ConsoleReader(System.in);

		System.out.print("What is the X-Coordinate of the Circle: ");
		int xcir = cin.readInt();

		System.out.print("What is the Y-Coordinate of the Circle: ");
		int ycir = cin.readInt();

		System.out.print("Enter Circle Radius: ");
		int rad = cin.readInt();

		System.out.print("Enter How Many Darts You Want To Throw: ");
		int n = cin.readInt();

		double num = n;

		Random generator = new Random();

		for(long i = 1; i <= n; ++i)
		{
			x = 1 + generator.nextInt(POINT);
			y = 1 + generator.nextInt(POINT);

			//System.out.print("Dart Location: ("+x+","+y+")  ");
			if(getLength(x,y,xcir,ycir,rad) > 1)
			{
				//System.out.println("You Missed: " + getLength(x,y,xcir,ycir,rad));
				miss++;
			}
			else
			{
				hit++;
				if(getLength(x,y,xcir,ycir,rad) == 0)
				{
					//System.out.println("Bulls Eye: " + getLength(x,y,xcir,ycir,rad));
				}
				else
				{ 
					//System.out.println("Good Shot: " + getLength(x,y,xcir,ycir,rad));
				}
			}
			if(i%1000 == 0)
			{
				if(i%20000 == 0)
				{
					est = hit/num;
				}
				else
				{
					dartEST(hit,i,num);
				}
			}
		}	

		double absValue = Math.abs(est - (Math.PI/4));
		System.out.println("\n\n\n");

		System.out.println("The computer's value of PI from Math.PI is: " + Math.PI/4);
		System.out.println("The absolute value difference between Math.PI and my final estimated value for PI is: " + absValue);
		System.out.println("# of misses: " + miss);
		System.out.println("# of hits  : " + hit);

	}

	public static double getLength(int x1, int y1, int xc1, int yc1, int rad1)
	{
		double length = Math.sqrt(Math.pow(xc1-x1,2) + Math.pow(yc1-y1,2));
		return length;
	}
	public static void dartEST(int h1, long i, double num)
	{
		System.out.println("After " + i + " darts, the estimate value for PI is: " + h1/num);	

	}
}