gradebook

import java.util.Scanner;

/*
 * Grade Book
 *
 * By: Nyia Lor
 *
 * The program allows the user to enter student name and scores for
 * exams, quizzes, and homework.  It also has an option of computing
 * the grade for each student and plot the class distribution.  User can go in
 * and add more student data if necessary.  The program supports up to 200 students
 * and a max of 10 grade items for each category.
 *
 */
public class GradeBook {

    public static void main(String[] args) {

        Scanner s = new Scanner(System.in);

        // switch on the type of test
        // add counters -- every time a person is added it
        // starts at the first position at i = 0

        int eCounter = 0;
        int qCounter = 0;
        int hCounter = 0;

        // arrays for exam, quizzes, homework
        int[][] e = new int[200][10];
        int[][] q = new int[200][10];
        int[][] h = new int[200][10];
        String[] students = new String[200];


        //There are 200 possible students with one final grade
        double [][] gradeArray = new double[200][1];

        System.out.println("Welcome to GradeBook!");

        System.out.println("Please provide grade item details");

        // prompt the user to enter scores

        System.out.print("Exams (number, points, weight)   : ");

        // setting exam into an array

        String[] exam = s.nextLine().split("\\s+");

        // setting quizzes into an array

        System.out.print("Quizzes (number, points, weight) : ");
        String[] quizzes = s.nextLine().split("\\s+");

        // setting hw into an array

        System.out.print("Homework (number, points, weight): ");
        String[] hw = s.nextLine().split("\\s+");

        // prompt the user for options

        outer: for (;;) {
            System.out.println("\n----------------------------");
            System.out.println("What would you like to do?");
            System.out.println("  1 Add student data");
            System.out.println("  2 Display student grades & statistics");
            System.out.println("  3 Plot grade distribution");
            System.out.println("  4 Quit");
            System.out.print("Your choice: ");
            int choice = s.nextInt();
            s.nextLine();



            // user's option

            switch (choice) {

            case 1:
                System.out
                        .println("Enter student data (Enter done with finish): ");



                for (int i = 0; i < students.length; i++) {

                    String data = s.nextLine();

                    if (data.equals("done"))
                        break;

                    // finding the index of :

                    int indexColon = data.indexOf(':');

                    String name = data.substring(0, indexColon);

                    students[i] = name;

                    String scores = data.substring(indexColon + 1,
                            data.length()).trim();

                    // regular expression: doesn't matter how many spaces -->
                    // use one space
                    String[] studScore = scores.split("\\s+");

                    /**
                     * looking through all of student i's scores via a for loop
                     */

                    for (int j = 0; j < studScore.length; j++) {



                        String currentScore = (String) studScore[j];

                        // example of studScore[j] : a23
                        // 1. find and store the type of test

                        char typeOftest = currentScore.charAt(0);
                        // 2. find and store the test score

                        int score = Integer.parseInt(currentScore.substring(1,
                                currentScore.length()));

                            switch (typeOftest) {
                            // store type of test score into the specific array e,
                            // q, and h
                            case 'e':

                                e[i][eCounter] = score;

                                eCounter++;

                                break;
                            case 'q':

                                q[i][qCounter] = score;

                                qCounter++;

                                break;
                            case 'h':

                                h[i][hCounter] = score;

                                hCounter++;

                                break;
                            default:
                                break;
                            }
                    }

                }

                break;
            case 2:
                System.out.println("Display student grades & statistics: ");

                // loop for student names

                for (int i = 0; i < students.length; i++) {

                    if (students[i] == null)break;

                    String name = students[i];

                    double totalGrade = 0.0;

                    double eGrade = 0.0;

                    System.out.print("Name");
                    System.out.print(name);

                    // loop for each type of test exam scores
                    // e[i] ==> finding the length of the array inside the
                    // position of e[i]

                    for (int E = 0; E < e[i].length; E++) {

                        if(e[i].length == 0)break;

                        //score = the score of exam entered

                        double score = e[i][E];

                        // set grade in here.

                        /*value of what the exam is out of (3 100 60)
                         * exam is out of 100
                         */
                        double outOf = Double.parseDouble(exam[1]);

                        double percentage = score / outOf;

                        eGrade = eGrade + (percentage * 100);

                        System.out.print("Exam");
                        System.out.print(e[i][E]);


                    }
                        /*
                         * Calculating total grade
                         * exam[0] = the number of exams
                         * exam[2] = the weight of exam
                         */
                        eGrade = (eGrade / Double.parseDouble(exam[0]))
                            * (Double.parseDouble(exam[2]) / 100);

                    double qGrade = 0.0;

                    // loop for each type of test exam scores
                    // q[i] ==> finding the length of the array inside the
                    // position of q[i]

                    for (int Q = 0; Q < q[i].length; Q++) {


                        if(q[i].length == 0) break;

                        //score = the score of quiz entered

                        double score = q[i][Q];

                        // set grade in here.

                        /*value of what the quiz is out of (3 100 20)
                         * quiz is out of 100
                         */
                        double outOf = Double.parseDouble(quizzes[1]);

                        double percentage = score / outOf;

                        qGrade = qGrade + (percentage * 100);

                        System.out.print("Quiz");
                        System.out.print(q[i][Q]);


                    }
                    /*
                     * Calculating total grade
                     * quizzes[0] = the number of quizzes
                     * quizzes[2] = the weight of quizzes
                     */
                        qGrade = (qGrade / Double.parseDouble(quizzes[0]))
                            * (Double.parseDouble(quizzes[2]) / 100);

                    double hGrade = 0.0;

                    for (int H = 0; H < h[i].length; H++) {

                        if(h[i].length == 0)break;

                        //score = the score of hw entered

                        double score = h[i][H];

                        // set grade in here.
                        /*value of what the hw is out of (3 100 20)
                         * hw is out of 100
                         */
                        double outOf = Double.parseDouble(hw[1]);

                        double percentage = score / outOf;

                        hGrade = hGrade + (percentage * 100);

                        System.out.print("Hwork");
                        System.out.print(h[i][H]);


                    }
                    /*
                     * Calculating total grade
                     * hw[0] = the number of homework
                     * hw[2] = the weight of homework
                     */
                        hGrade = (hGrade / Double.parseDouble(hw[0]))
                            * (Double.parseDouble(hw[2]) / 100);

                        //total grade

                        totalGrade = eGrade + qGrade + hGrade;

                        System.out.print("Grade");
                        System.out.print(totalGrade);
                }

                break;
            case 3:
                System.out.println("Plot grade distribution: ");

                //gradeArray = new double[students[i]][totalGrade]; //array capable of storing the number of grades output



                break;
            case 4:
                System.out.println("Goodbye!");
                break outer;
            default:
                System.out
                        .println("Please select of the the following option.");
                break;
            }
        }

    }
}