C#语言入门详解

看看我这个有问题没https://www.bilibili.com/video/BV1wx411K7rb?t=4147.0&;p=5

    public double Count(int x) 

    { 

      if (x == 1)

      {

        return 1;

      }

      else

      {

        double result = Count(x-1)*2+1;

        return result;

      }

    }