if else练习

using System;
using System.Collections.Generic;
using System.Text;

namespace _._7练习二用iF_else重试练习
{
    class Program
    {
        static void Main(string[] args)
        {
            string result = Console.ReadLine();
            for (int i = 0; i < 4; i++)
            {
                if (result == "A")
                {
                    Console.WriteLine("A成绩的分数段是80-100");

                }
                else if (result == "B")
                {
                    Console.WriteLine("B成绩的分数段是70-85");
                }
                else if (result == "C")
                {
                    Console.WriteLine("C成绩的分数段是60-70");

                }
                else
                {
                    Console.WriteLine("D成绩的分数段是60以下");
                }
                result = Console.ReadLine();//注意最后赋值
               
            }
        }
    }
}