学习联系 Java阶乘相关练习

题目一：一张纸的厚度大约是0.08mm，对折多少次之后能达到珠穆朗玛峰的高度

double hou = 0.00008;
        for (int i = 1; i > 0; i++)
        {
            hou = hou * 2;
            if (hou > 8848.13)
            {
                System.out.println(i);
                break;//跳出循环
            }
        }

题目二：计算5的阶乘 5!的结果是？

//阶乘
        Scanner a = new Scanner(System.in);
        int sum = 1;
        System.out.println("请输入一个数字");
        int shu = a.nextInt();
        for (int i = 1; i <= shu; i++)
        {
            sum = sum * i ;
        }
        System.out.println("结果为：" + sum);
        

 题目三：计算 1+1/2!+1/3!+1/4!+...1/20!=?

//计算 1+1/2!+1/3!+1/4!+...1/20!=?
        Scanner b = new Scanner(System.in);
        double he = 0;
        System.out.println("请输入数字：");
        double shuzi = b.nextInt();
        for (int i = 1; i <= shuzi; i++)
        {
            double jiecheng = 1;
            //求i的阶乘
            for (int j = 1; j <= i; j++)
            {
                jiecheng = jiecheng*j/i;
            }
            he = he + jiecheng;//累加
        }

        System.out.println("阶乘的和为"+he);
        
        
        
        }

    }