分支-06. 成绩转换

import java.util.Scanner;  
public class Main 
{
    public static void main(String[] args)
    {
        Scanner score = new Scanner(System.in);
        int s = score.nextInt();
        if(s >= 90) 
         System.out.print("A");
         else
         {
              if(s >= 80) 
              System.out.print("B");
              else
              {
                if(s >= 70)
                System.out.print("C");
                else
                {
                  if(s >= 60)
                  System.out.print("D");
                  else System.out.print("E");
                }    
              }
         }
    }
}