Java 練習(輸入學生成績，判斷成績等級)

效果如下：

import java.util.Scanner;

public class ArrayDemo1 {
	public static void main(String[] args) {
		//1.使用Scanner 讀取學生個數
		Scanner scanner = new Scanner(System.in);
		System.out.println("請輸入學生人數: ");
		int number = scanner.nextInt();
		
		//2.創建數組，存儲學生成績，動態初始化
		int[] scores = new int[number];
		
		//3.給數組中的元素賦值
		int maxScore = 0;
		System.out.println("請輸入"+ number + "個學生成績: ");
		for(int i = 0; i< scores.length; i++) {
			scores[i] = scanner.nextInt();
			
			//4.獲取數組中的元素的最大值：最高分
			if(maxScore < scores[i]) {
				maxScore = scores[i];
			}
		}
		
		//5.根據每個學生成績與最高分的差值，得到每個學生的等級，並輸出等級和成績
		char level;
		for(int i = 0; i< scores.length; i++) {
			if(maxScore - scores[i] <= 10) {
				level = 'A';
			}else if(maxScore - scores[i] <= 20) {
				level = 'B';
			}else if(maxScore - scores[i] <= 30) {
				level = 'C';
			}else {
				level = 'D';
			}
		
		System.out.println("Student "+ i + " score is " + scores[i] + ", grade is " + level);
		}
	}

}