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);

         }

     }