Darts.java

/**
 * The purpose of this program is to calculate the value of pi by simulating throwing darts at a dart board. 
 * 
 * @author Bijan Tajmir
 * @date  12/17/2014
 */
import java.util.Scanner;

public class Darts
{  
    public static double x = (2 * Math.random()) - 1, y = (2 * Math.random()) -1, radius = 1.0;
    public static double numberOfX = 0, numberOfY = 0, numberOfHits = 0, pi = 0, average = 0;
    public static int dartThrows = 0, numberOfTrials = 0;
    
    public static int hits (double x, double y, int numTrials)
    {
        numberOfHits = 0;
        for(int n = 1; n < numTrials; n++)
        {
        x = (2 * Math.random()) - 1;
        y = (2 * Math.random()) - 1;
        if((Math.pow(x, 2) + Math.pow(y, 2)) <= (Math.pow(radius, 2)))
        {
            numberOfHits++;
        }
        }
        return (int)numberOfHits;

    }
    
    public static double calculatePi (double numberOfHits, double dartThrows)
    {
        double pi = (4 * ((double)(numberOfHits)) / dartThrows);
        return pi;
    }
    
    public static void main (String[] args)
    {
        
        Scanner in = new Scanner(System.in);
        
        System.out.println("How many times should the darts be thrown per trial?");
        dartThrows = in.nextInt();
        
        System.out.println();
        
        System.out.println("How many trials should there be?");
        numberOfTrials = in.nextInt();
        
        double total = 0.0;
        
        
        
        for(int n = 0; n < numberOfTrials; n++)
        {
        int hits = hits(x,y,dartThrows);
        double approxPi = calculatePi(hits,dartThrows);
        total += approxPi;
        System.out.printf("Trial " + (n+1) + ": pi = %12f\n", approxPi);
        }
        double average = (total / numberOfTrials);
        System.out.printf("Average Calculation of Pi: %1.5f", average);
        
        
    }
    
}