作业

import java.util.Scanner;
class day3 {
public static void main(String[] args) {
Scanner score =new Scanner(System.in);
int i =score.nextInt();
if (i>=90){
System.out.println("等级：A");
}else if (i>=70){
System.out.println("等级：B");
}else if (i>=60){
System.out.println("等级：C");
}else{
System.out.println("等级：D");
}




switch (i/10){
case 10:System.out.println("等级：A");
break;
case 9:System.out.println("等级：A");
break;
case 7:System.out.println("等级：B");
break;
case 6:System.out.println("等级：C");
break;
default:System.out.println("等级：D");
break;



}


}
}