怎么把分数转行成等级

就是60-70等于及格，71-80良好~~求列子谢谢~~~

if(score <60)    Console.WriteLine("不及格"); else if(score>=60 && score<=70)    Console.WriteLine("及格"); else if(score>=71 && score<=80)    Console.WriteLine("良好"); else   Console.WriteLine("优秀");

 public string GetFlag(int score)         {               if (score < 60)                 return "不及格";             else if (score >= 60 && score <= 70)                 return "及格";             else if (score >= 71 && score <= 80)                 return "良好";             else return "优秀";         }