软件大赛题目----（第五个）计算圆周率

下面贴上代码

package com.bird.software; /** * * @author Bird * */ public class Test5 { public static void main(String[] args){ double x = 1; double y = 1; int a = 1; int b = 3; while(y > 1e-15){ y = y * ((double)a/b); x += y; a++; b += 2; } System.out.println(x * 2); } }

运行结果为

3.141592653589791