编辑代码

// 3. 老师问学生问题  
        string answer = "";  
        int count = 0;  
        while (answer.ToLower() != "y" && count < 10)  
        {  
            Console.WriteLine("老师问学生,这道题你会做了吗?");  
            answer = Console.ReadLine();  
            if (answer.ToLower() == "n")  
            {  
                Console.WriteLine("老师再讲一遍");  
                count++;  
            }  
        }  
        if (answer.ToLower() == "y" || count == 10)  
        {  
            Console.WriteLine("放学了");  
        }