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