从键盘读入学生成绩，找出最高分，并输出学生成绩等级

从键盘读入学生成绩，找出最高分，并输出学生成绩等级

直接循环输入并判断就行了。

//从键盘读入学生成绩，找出最高分，并输出学生成绩等级。
//等级>=最高分-10，等级为‘A’
//等级>=最高分-20，等级为‘B’
//等级>=最高分-30，等级为‘C’
//其余，等级为‘D’
package com.company;
import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        System.out.println("please enter the number of students:");
        Scanner scanner =new Scanner(System.in);
        int i=scanner.nextInt();
        int max_i=0, max=0;
        int[] arr=new int[i];
        for(int j=0;j<i;j++) {
            System.out.println("please enter the score of student"+(j+1));
            int scoer=scanner.nextInt();
            arr[j]=scoer;

            if(scoer>max){
                max=scoer;
                max_i=j;
            }
        }
        System.out.println("The students with the highest score are :"+(max_i+1)+ ",score is："+arr[max_i]);

        for (int k=0;k<i;k++){
            switch((max-arr[k])/10){
                case 0:
                    System.out.println("student "+(k+1)+" score is "+arr[k]+",grade is A");
                    break;
                case 1:
                    System.out.println("student "+(k+1)+" score is "+arr[k]+",grade is B");
                    break;
                case 2:
                    System.out.println("student "+(k+1)+" score is "+arr[k]+",grade is C");
                    break;
                default:
                    System.out.println("student "+(k+1)+" score is "+arr[k]+",grade is D");
                    break;
            }

        }

    }
}

成绩等级按什么范围划分呢？等级是指A,B,C,D,E吗？