Question

For input you can either a console Scanner or a dialog box (a modal dialog) and the static method showInputDialog() of the JOptionPane class which is within the javax.swing package like this String name= newJOptionPane.showInputDialog(” Please enter your data:”). Then convert the String object to a number using Integer.parseInt() or Double.parseDouble()

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Write a java the ”Letter grade” program that inputs several test scores from user and displays for each the corresponding letter grade using a scale 90 – 80 – 70 – 50. Test thoroughly the program with different data sets of your own.

Answer 1

import javax.swing.JOptionPane;

public class LetterGrade {
        public static void main(String[] args) {
                while (true) {
                        //reading score from user
                        String str = JOptionPane.showInputDialog("Please enter your score (-1 to exit):");
                        //converting it into double
                        double score = Double.parseDouble(str);
                        //break if it is -1
                        if(score==-1) break;
                        //finding the letter for given score
                        String letter = getLetter(score);
                        //showing the score and letter
                        JOptionPane.showMessageDialog(null, score+"          "+letter);
                }
        }
//returns letter grade for given score
        private static String getLetter(double n) {
                if (n >= 90)
                        return "A";
                if (n >= 80)
                        return "B";
                if (n >= 70)
                        return "C";
                if (n >= 60)
                        return "D";
                return "F";
        }
}

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