多选择结构

package struct;

import java.util.Scanner;

public class IfDemo3 {
    public static void main(String[] args) {
        Scanner scanner=new Scanner(System.in);
        
        System.out.println("请输入成绩");
        int score=scanner.nextInt();
        if (score==100) {
            System.out.println("恭喜满分");
        }else if(score<100&&score>=90){
            System.out.println("A级");
        }else if(score<90&&score>=80){
            System.out.println("B级");
        }else if(score<80&&score>=70){
            System.out.println("C级");
        }else if(score<70&&score>=60){
            System.out.println("D级");
        }else if(score<60&&score>=0){
            System.out.println("不及格");
        }
        else {
            System.out.println("成绩不合法");
        }
    }
}