2018-11-22练习二

int n = 1;

        int count = 0;
        string answer = ""; 
        
        do
        {
            Console.Write("您正在玩第{0}局，成绩为：", n);
            string str_score = Console.ReadLine();
            int score = Convert.ToInt32(str_score);
            if (score > 80)
            {
                count++;
            }
            n++;
            if (n > 5)
            {
                Console.WriteLine("游戏结束");
            }
            else
            {
                Console.Write("\n继续玩下一局吗?(yes/no)");
                answer = Console.ReadLine();
                if ("no" == answer)
                {
                    Console.Write("\n您已经中途退出程序了");
                    break;
                }
                else
                {
                    Console.WriteLine("进入一局");
                }
            }

        } while (n <= 5);


        double rate = count / 5.0;     
        if (n > 5)
        {
            if (rate > 0.8)
            {
                Console.WriteLine("恭喜，通过一级");
            }
            else if (rate > 0.6)
            {
                Console.WriteLine("通过二级");
            }
            else
            {
                Console.WriteLine("\n对不起，你未能晋级，继续加油吧~");
            }

        }
        else
        {
            Console.WriteLine("对不起，你没有完成游戏，不能晋级，继续加油努力");
        }
        Console.ReadKey();