Converting C++ to Java

[MissPianist43]

Hello I need help converting this C++ code to java. I have tried myself, but was not able to understand how to be able to do that. Here is the code, and I'm sorry if you are just as stuck as I am. Thank you!

Code:

class Student implements Comparable<Student> {
        String name;
        String Id;
        int score;

        // ----------------------------------------------------------------------------------
        // Student constructor
        // ----------------------------------------------------------------------------------
        public Student(String studentName, String studentId, int studentScore) {
                name = studentName;
                Id = studentId;
                score = studentScore;
        }

        public Student() {

                name = "";
                Id = "";
                score = -1;

        }

        // ----------------------------------------------------------------------------------
        // Setters for the attributes of a student
        // ----------------------------------------------------------------------------------
        void setName(String studentName) {

                name = studentName;
        }

        void setId(String studentId) {
                Id = studentId;
        }

        void setScore(int studentScore) {
                score = studentScore;
        }
        // ----------------------------------------------------------------------------------

        // Getters for the attributes of a student
        // ----------------------------------------------------------------------------------

        String getName() {
                return name;
        }

        String getId() {
                return Id;

        }

        int getScore() {
                return score;
        }

        // -----------------------------------------------------------------
        // Create a one-line description of the student as a string
        // -----------------------------------------------------------------
        public String toString() {
                String studentInfo = score + "\t\t" + Id + "\t\t" + name;
                return (studentInfo);
        }

        @Override
        public int compareTo(Student aStudent) {
                if (this.score < aStudent.score)
                        return -1;
                else if (this.score == aStudent.score)
                        return 0;
                else
                        return 1;

        }
}




import java.util.Scanner;

public class StudentRoster {

        static Scanner scan = new Scanner(System.in);

        // Declare the roster of size ARRAY_MAX_SIZE below.
        static int SIZE = 10;

        // Get the student information from the keyboard
        private static Student getStudentInfo() {
                System.out.print("Enter student name : ");
                String name = scan.nextLine();
                System.out.print("Enter student id : ");
                String id = scan.nextLine();
                System.out.print("Enter student score : ");
                int score = Integer.parseInt(scan.nextLine());

                Student std = new Student(name, id, score);
                return std;
        }

        // Display output heading
        private static void displayHeading() {
                System.out.println("\n----- STUDENT ROSTER -----\n");
                System.out.println("***********************************************************************");
                System.out.println("By John Doe, CS1301-Section xx, Spring 2017");
                System.out.println("***********************************************************************\n");
        }

        // Display the menu
        private static void displayMenu() {
                System.out.print(
                                "\nAvailable operations:\n1. Add a student\n2. Delete a student\n3. Display at and above the average students\n4. Display all the students\n9. End the program\n\nEnter your desired option: ");
        }

        // find the student by his id
        private static int findStudent(Student[] roster, int numofstudents, String studentId) {
                int result = -1;
                for (int i = 0; i < numofstudents; i++) {
                        if (roster[i].Id.equals(studentId))
                                return i;
                }
                return (result);
        }

        // Compute the average score of all the students
        private static double average(Student[] roster, int numofstudents) {
                double total = 0;
                for (int i = 0; i < numofstudents; i++) {
                        total += roster[i].score;
                }
                return total / numofstudents;
        }

        public static void main(String[] args) {

                final int SENTINEL = 9;
                Scanner sc = new Scanner(System.in);
                Student roster[] = new Student[SIZE];
                int numofstudents = 0;
                int input;
                displayHeading();
                while (true) {
                        displayMenu();
                        input = Integer.parseInt(sc.nextLine());
                        switch (input) {
                        case 1:
                                roster[numofstudents++] = getStudentInfo();
                                break;

                        case 2:
                                if (numofstudents <= 0)
                                        System.out.println("Sorry, there are no students to delete!");
                                else {
                                        System.out.print("Enter the student Id: ");
                                        String id = sc.nextLine();
                                        int index = findStudent(roster, numofstudents, id);
                                        if (index == -1)
                                                System.out.println("The student with Id " + id + " is not found.");
                                        else
                                                for (int i = index; i < numofstudents - 1; i++)
                                                        roster[i] = roster[i + 1];

                                        numofstudents--;
                                }
                                break;

                        case 3:
                                if (numofstudents <= 0)
                                        System.out.println("Sorry, there are no students to display!");
                                else {
                                        System.out.println("Students are :");
                                        for (int i = 0; i < numofstudents; i++) {
                                                if (roster[i].score >= average(roster, numofstudents)) {
                                                        System.out.println(roster[i]);
                                                }
                                        }
                                }
                                break;

                        case 4:
                                if (numofstudents <= 0)
                                        System.out.println("Sorry, there are no students to display!");
                                else {
                                        System.out.println("Students are :");
                                        for (int i = 0; i < numofstudents; i++) {

                                                System.out.println(roster[i]);

                                        }
                                }
                                break;

                        case 9:
                                break;
                        }

                        if (input == 9)
                                break;
                }
                System.out.println("\nHave a nice day!\n");

        }

}

[wolle]

I need help converting this C++ code to java.

You don't need to because it is Java already.

[TheBigTommy]

Did you mean converting it from Java to C++?