Can someone help me finish my code all thats left is to display the average test score and to display the letter grade. Thanks!!

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import javax.swing.JOptionPane;

/** This program demonstrates a solution to the Test Scores and Grade programming challenge. */

public class TestScoresAndGrade { public static void main(String[] args) { double test1, // Test score #1 test2, // Test score #2 test3, // Test score #3 average; // Average test score char grade; // Letter grade String input; // Input from the user

// Get three test scores from the user. input = JOptionPane.showInputDialog("Enter test score #1: "); test1 = Double.parseDouble(input); //validate test1 to make sure it is in the proper range //get input for test 2 input = JOptionPane.showInputDialog("Enter test score #2: "); test2 = Double.parseDouble(input); //validate test2 to make sure it is in the proper range //get input for test 3 input = JOptionPane.showInputDialog("Enter test score #3: "); test3 = Double.parseDouble(input); //validate test3 to make sure it is in the proper range // Calculate the average test score. average = (test1 + test2 + test3) / 3;

// Determine the letter grade. if (testScore < 60) { JOptionPane.showMessageDialog(null, "Your grade is a F."); } else if (testScore < 70) { JOptionPane.showMessageDialog(null, "Your grade is a D."); } else if (testScore < 80) { JOptionPane.showMessageDialog(null, "Your grade is a C."); } else if (testScore < 90) { JOptionPane.showMessageDialog(null, "Your grade is a B."); } else { JOptionPane.showMessageDialog(null, "Your grade is a A."); }

// Display the average test score.

// Display the letter grade. System.exit(0); } }