小编ken*_*nns的帖子

public class look
{
    public int takeALook (int a)
    {
        if (a == 1)
            return 1;
        else if (a == 0)
            return 0;
        else
            return takeALook(a-2) + takeALook(a-1);

    }
}

主程序,

int a = 6;

look lk = new look();

int r = lk.takeALook(a);

Console.WriteLine("r is" + r);

答案是8.但任何人都可以解释原因吗？令我困惑的是因为它自称是2倍.