010-题目：利用条件运算符的嵌套来完成此题：学习成绩>=90分的同学用A表示，60-89分之间的用B表示，60分以下的用C表示。

import java.util.Scanner;public class Main {public static String score(int score) {if (score >= 90 && score <= 100) {return "A";} else if (score >= 60) {return "B";} else if (score >= 0) {return "C";} else {return null;}}@SuppressWarnings("resource")public static void main(String[] args) {Scanner in = new Scanner(System.in);int nextInt = in.nextInt();System.out.println(score(nextInt));}}

56C