使用if和Switch判断学生成绩

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using System;using System.Collections.Generic;using System.Text;namespace ConsoleApplication2{    class Program    {        static void Main(string[] args)        {            Console.WriteLine("请输入学生成绩：");            int score = int.Parse(Console.ReadLine());             if (score > 90)             {                 Console.WriteLine("该学生优秀");             }             else if (score > 80)             {                 Console.WriteLine("该学生优秀");             }             else if (score > 70)             {                 Console.WriteLine("该学生中等");             }             else if (score >= 60)             {                 Console.WriteLine("该学生及格");             }             else             {                 Console.WriteLine("该学生不及格");             }             /*             int temp = score/10;             switch (temp)             {                 case 9:                     Console.WriteLine("该学生优秀");                     break;                 case 8:                     Console.WriteLine("该学生良好");                     break;                 case 7:                     Console.WriteLine("该学生中等");                     break;                 case 6:                     Console.WriteLine("该学生及格");                     break;                 default:                     Console.WriteLine("不及格");                     break;             }             */            Console.ReadLine();        }    }}