小编use*_*129的帖子

该计划的目的是让用户输入三个考试成绩,并将其平均成绩和字母成绩返回给他们.

它当前编写的方式给出了'public static String getLetterGrade ..'行的错误,我不知道为什么会这样.

public class GradeProblem
{
public static void main(String[] args)
{
 char letterGrade;
 String exam1, exam2, exam3;
 double exam1Score, exam2Score, exam3Score, average; 

 exam1 = JOptionPane.showInputDialog(null, "Enter your score for Exam 1: ");
 exam1Score = Double.parseDouble(exam1.substring(0,2));
 int intExam1Score = (int)exam1Score;

 exam2 = JOptionPane.showInputDialog(null, "Enter your score for Exam 2: ");
 exam2Score = Double.parseDouble(exam2.substring(0,2));
 int intExam2Score = (int)exam2Score;

 exam3 = JOptionPane.showInputDialog(null, "Enter your score for Exam 3: ");
 exam3Score = Double.parseDouble(exam3.substring(0,2));
 int intExam3Score = (int)exam3Score;

 average = …