import java.util.Scanner; class grade{ //记得修改文件名 public static void main (String[] args){ System.out.println("请输入您的分数"); int g; //定义成绩为"g" Scanner sc=new Scanner(System.in); g=sc.nextInt(); if(g>100 || g<0) { System.out.println("您输入的分数有误!"); } else { switch (g/10) { case 10: case 9: System.out.println("您的等级为A"); break; case 8: System.out.println("您的等级为B"); break; case 7: System.out.println("您的等级为C"); break; case 6: System.out.println("您的等级为D"); break; default: System.out.println("您的等级为E"); break; } } } }