GPA_Calculator/GPA.java at main · Nexfu22/GPA_Calculator · GitHub

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import java.util.Scanner;

public class GPA {

    public static void main(String[] args) {

        Scanner input = new Scanner(System.in);

        System.out.print("Enter student name: ");
        String name = input.nextLine();

        int numberOfSubjects = 0;

        while (true) {
            System.out.print("Enter number of subjects: ");
            try {
                numberOfSubjects = Integer.parseInt(input.nextLine());

                if (numberOfSubjects > 0) {
                    break;
                } else {
                    System.out.println("Number must be greater than zero!");
                }

            } catch (NumberFormatException e) {
                System.out.println("Invalid input! Please enter numbers only.");
            }
        }

        int totalHours = 0;
        double totalQualityPoints = 0;

        for (int i = 1; i <= numberOfSubjects; i++) {

            System.out.println("\nSubject " + i);

            System.out.print("Enter subject name: ");
            input.nextLine();

            int hours = 0;

            while (true) {
                System.out.print("Enter subject credit hours: ");

                try {
                    hours = Integer.parseInt(input.nextLine());

                    if (hours > 0) {
                        break;
                    } else {
                        System.out.println("Hours must be greater than zero!");
                    }

                } catch (NumberFormatException e) {
                    System.out.println("Invalid input! Enter numbers only.");
                }
            }

            double grade = 0;

            while (true) {
                try {
                    System.out.print("Enter subject grade (0 - 100): ");
                    grade = Double.parseDouble(input.nextLine());

                    if (grade >= 0 && grade <= 100) {
                        break;
                    } else {
                        System.out.println("Invalid grade! Must be between 0 and 100.");
                    }

                } catch (NumberFormatException e) {
                    System.out.println("Invalid input! Enter numbers only.");
                }
            }

            double gradePoint;

            if (grade >= 93)
                gradePoint = 4.0;
            else if (grade >= 90)
                gradePoint = 3.7;
            else if (grade >= 87)
                gradePoint = 3.3;
            else if (grade >= 83)
                gradePoint = 3.0;
            else if (grade >= 80)
                gradePoint = 2.7;
            else if (grade >= 77)
                gradePoint = 2.3;
            else if (grade >= 73)
                gradePoint = 2.0;
            else if (grade >= 70)
                gradePoint = 1.7;
            else if (grade >= 67)
                gradePoint = 1.3;
            else if (grade >= 60)
                gradePoint = 1.0;
            else
                gradePoint = 0.0;

            totalHours += hours;
            totalQualityPoints += gradePoint * hours;
        }

        double gpa = totalQualityPoints / totalHours;

        String finalGrade;

        if (gpa >= 3.85)
            finalGrade = "A+";
        else if (gpa >= 3.7)
            finalGrade = "A";
        else if (gpa >= 3.5)
            finalGrade = "A-";
        else if (gpa >= 3.3)
            finalGrade = "B+";
        else if (gpa >= 3.0)
            finalGrade = "B";
        else if (gpa >= 2.7)
            finalGrade = "B-";
        else if (gpa >= 2.3)
            finalGrade = "C+";
        else if (gpa >= 2.0)
            finalGrade = "C";
        else if (gpa >= 1.7)
            finalGrade = "C-";
        else if (gpa >= 1.3)
            finalGrade = "D+";
        else if (gpa >= 1.0)
            finalGrade = "D";
        else
            finalGrade = "F";

        System.out.println("\n========== RESULT ==========");
        System.out.println("Student Name: " + name);
        System.out.println("Total Credit Hours: " + totalHours);
        System.out.printf("Final GPA: %.2f\n", gpa);
        System.out.println("Final Grade: " + finalGrade);

        input.close();
    }
}