import java.util.Scanner;

public class ShowGradeMulti {

public static void main(String[] args) {

float grade = 0; // 百分制成绩

Scanner console = new Scanner(System.in);

System.out.print("请输入成绩：");

grade = console.nextFloat();

while(grade >= 0) {

showGrade(grade);

grade = console.nextFloat();

}

}

private static void showGrade(float grade) {

String gradeLevel = ""; // 等级分

int level = (int)grade / 10; // 转换为整数

switch(level) {

case 10:

case 9:

gradeLevel = "优秀";

break;

case 8:

gradeLevel = "良好";

break;

case 7:

gradeLevel = "中等";

break;

case 6:

gradeLevel = "及格";

break;

default:

gradeLevel = "不及格";

}

System.out.println("输入成绩为：" + grade + "，成绩等级为：" + gradeLevel);

}

}