java if_else__的应用3

import java.util.Scanner;//
public class Dome1{
    public static void main(String []args ){
        Scanner input = new Scanner (System.in );
        float score;
        System.out.print("请输入成绩:");
        score = input.nextFloat();
        if(score>100||score <=0){//如果score大于100,或者小于等于0时
        System.out.print("输入成绩错误!");//则输出   输入成绩错误
        }
        else{//否则进行下面的判断
        if(score>=90&&score <=100){
            System.out.print("A");
        }
        else if(score >= 80&&score <=90){
            System.out.print("B");
        }
        else if(score >=70&&score <=80){
            System.out.print("C");
        }
        else if(score >=60&&score <=70){
            System.out.print("D");
        }
        else{
            System.out.println("不及格!");
        }
            }
        
        
        
        
        
    }
}