//一对幼兔，1个月后长成小兔，            //再过一个月长成成兔并且生下一对幼兔，            //问，24个月后，有多少对兔子。            while (true)            {                int m, ct, xt, yt, zt;                Console.Write("请输入月份：");                m = int.Parse(Console.ReadLine());                ct = 0; xt = 0; yt = 1; zt = 1;                for (int i = 1; i <= m; i++)                {                    if (i == 1)                    {                        ct = 0; xt = 0; yt = 1; zt = 1;                    }                    else                    {                        ct = ct + xt;                        xt = yt;                        yt = ct;                        zt = ct + xt + yt;                    }                }                Console.WriteLine(ct);                Console.WriteLine(xt);                Console.WriteLine(yt);                Console.WriteLine(zt);            }