类名:GradeIf
import java.util.Scanner;
public class GradeIf {
public static void main(String[] ags){
/**
* 给分数评定等级
*/
Scanner input = new Scanner(System.in);
System.out.print("请输入学生的成绩");
double score = input.nextDouble();
if(score >= 85)
System.out.println("成绩等级为A级");
else if(score >= 70)
System.out.println("成绩等级为B级");
else if(score >= 60)
System.out.println("成绩等级为C级");
else
System.out.println("成绩等级为D级");
}
}