/**************************************************************
 * Monte Carlo Simulation to calculate Pi
 * Mark Goadrich
 * CSC 204 - Spring 2008
 **************************************************************/
public class Pi{

	// Main method to run the program
	public static void main(String[] args) {
	
		// declare our counter variables
		int i = 0;
		int c = 0;
		
		// loop 1000 times
		while (i < 1000) {
		
			// calculate x and y points between -1 and 1
			double x = (Math.random() * 2) - 1;
			double y = (Math.random() * 2) - 1;
			
			// if point is in unit circle, count it
			if (Math.sqrt(Math.pow(x, 2) + Math.pow(y, 2)) <= 1) {
				c++;
			}
			i++;
		}
		System.out.println("Our estimate of Pi is " + (((double)c / i) * 4));
	}
}