Java_Switch

import java.util.Scanner;
public class Switch_test{
public static void main(String[] agrs){
    float score;
    Scanner input  = new Scanner(System.in);
    while (true) {
    System.out.print("请输入你的成绩:");
    score = input.nextFloat();
    if (score<0||score>100){
    System.out.println("请输入百分制成绩!!!!");
    }
    else
    {
    int a=(int)score/10;
    switch(a){
        case 10 : System.out.println("A"); break;
        case 9 : System.out.println("A"); break;
        case 8 : System.out.println("B"); break;
        case 7 : System.out.println("C"); break;
        case 6 : System.out.println("D"); break;
        default : System.out.println("不及格"); break;
}
}
}
}
}