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Thread: Converting C++ to Java

  1. #1
    Join Date
    Apr 2018
    Posts
    1

    Exclamation Converting C++ to Java

    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:

    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");
    
            }
    
    }
    Last edited by 2kaud; April 26th, 2018 at 08:46 AM. Reason: Added code tags

  2. #2
    Join Date
    Feb 2017
    Posts
    344

    Re: Converting C++ to Java

    Quote Originally Posted by MissPianist43 View Post
    I need help converting this C++ code to java.
    You don't need to because it is Java already.

  3. #3
    Join Date
    May 2017
    Posts
    3

    Re: Converting C++ to Java

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

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