蒙地卡罗法求 PI

package qinglin.learn.arithmetic;

import java.util.Random;

public class GetPi
{


	public static void main(String[] args)
	{
		int N=10000000;
		int sum=0;
		Random random = new Random();
		for(int i=0;i<N;i++)
		{
			double x = random.nextDouble();
			double y = random.nextDouble();
			if(x*x+y*y<1)
			{
				sum++;
			}
		}
		System.out.println((double)4*sum/N);
	}

}