Question

Java Program

Suppose a student was taking 5 different courses last semester. Write a program that

(a) asks the student to input his/her name, student ID, marks for these 5 courses,

(b) calculate the average,

(c) determine the letter grade of each course.

(d) record the number of courses whose final letter grade is A+, A, A-, .... , F+, F, F-.

(e) Output the following information in a nice format: student name, student ID, listing of marks, the average, letter grade for each course, and the number of courses in each letter grade category.

I dont know how to do d

here is my code:

import java.util.Scanner;

public class Question_2 {

   public String Grade(int mark) {

       String GradeLetter = "";

       if (mark >= 93 && mark <= 100)

           GradeLetter = "A+";

       if (mark >= 86 && mark < 93)

           GradeLetter = "A";

       if (mark >= 80 && mark < 86)

           GradeLetter = "A-";

       if (mark >= 77 && mark < 80)

           GradeLetter = "B+";

       if (mark >= 73 && mark < 77)

           GradeLetter = "B";

       if (mark >= 70 && mark < 73)

           GradeLetter = "B-";

       if (mark >= 67 && mark < 70)

           GradeLetter = "C+";

       if (mark >= 63 && mark < 67)

           GradeLetter = "C";

       if (mark >= 60 && mark < 63)

           GradeLetter = "C-";

       if (mark >= 57 && mark < 60)

           GradeLetter = "D+";

       if (mark >= 53 && mark < 57)

           GradeLetter = "D";

       if (mark >= 50 && mark < 53)

           GradeLetter = "D-";

       if (mark >= 35 && mark < 50)

           GradeLetter = "F";

       if (mark >= 0 && mark < 35)

           GradeLetter = "F-";

       return GradeLetter;

   }

   public static void main(String[] args) {

       Question_2 q2 = new Question_2();

       // declare variables

       String name;// student name

       int studentID;// student ID

       int mark1, mark2, mark3, mark4, mark5;// student marks in each 5 courses

       // asks the student to input his/her name

       System.out.println("Input your first name: ");

       Scanner input = new Scanner(System.in);

       name = input.nextLine();

       // asks the student to input student ID

       System.out.println("Input your StudentID (integer in 5 digits),ex:000000 :");

       studentID = input.nextInt();

       // asks the student to input marks of 5 different courses last semester

       System.out.println("Input your courses grade (0-100)integer number ");

       System.out.println("Your course1's grade: ");

       mark1 = input.nextInt();

       System.out.println("Your course2's grade: ");

       mark2 = input.nextInt();

       System.out.println("Your course3's grade: ");

       mark3 = input.nextInt();

       System.out.println("Your course4's grade: ");

       mark4 = input.nextInt();

       System.out.println("Your course5's grade: ");

       mark5 = input.nextInt();

       // Calculate the average of 5 different courses last semester

       double average = (mark1 + mark2 + mark3 + mark4 + mark5) / 5.0;

       /*

       * Output the following information in a nice format: student name,

       * student ID, listing of marks, the average, letter grade for each

       * course, and the number of courses in each letter grade category.

       */

       System.out.println("**********************************************");

       System.out.println("Student Name: " + name);

       System.out.println("Student ID : " + studentID);

       System.out.println(name + " grade in " + "Course1: " + mark1 + " " + q2.Grade(mark1));

       System.out.println(name + " grade in " + "Course2: " + mark2 + " " + q2.Grade(mark2));

       System.out.println(name + " grade in " + "Course3: " + mark3 + " " + q2.Grade(mark3));

       System.out.println(name + " grade in " + "Course4: " + mark4 + " " + q2.Grade(mark4));

       System.out.println(name + " grade in " + "Course5: " + mark5 + " " + q2.Grade(mark5));

       System.out.println(name + " avaerage grade is: " + average);

       System.out.println("**********************************************");

   }

}

Answer 1

import javax.swing.*;

import java.text.DecimalFormat;

public class Marks {

                public static void main(String[] args) {

                                // String variables to hold name and ID created

                                String studentName, studentID;

                                // Arrays to store student marks and letter grades created

                                int[] studentMarks = new int[5];

                                String[] studentLetters = new String[5];

                                // Array to store break down of letter grades created

                                int[] letterCount = new int[15];

                                // Initialize array

                                for(int i = 0; i < 15; i++)

                                                letterCount[i] = 0;

                                // Stores average mark

                                double average;

                                // Arrays that contain mark to letter conversion data created

                                String[] letterGrades = {"", "A+", "A", "A-", "B+", "B", "B-", "C+",

                                                                                                                                                "C", "C-", "D+", "D", "D-", "F", "F-"};

                                int[] letterMarks = {101, 93, 86, 80, 77, 73, 70, 67, 63, 60, 57, 53, 50, 35, 0};

                                // Prompt user for name and ID

                                studentName = JOptionPane.showInputDialog("What is your name?");

                                studentID = JOptionPane.showInputDialog("What is your Student ID?");

                                // Prompt user for marks and convert them to int

                                studentMarks[0] = Integer.parseInt(JOptionPane.showInputDialog("What is the mark for your first course?"));

                                studentMarks[1] = Integer.parseInt(JOptionPane.showInputDialog("What is the mark for your second course?"));

                                studentMarks[2] = Integer.parseInt(JOptionPane.showInputDialog("What is the mark for your third course?"));

                                studentMarks[3] = Integer.parseInt(JOptionPane.showInputDialog("What is the mark for your fourth course?"));

                                studentMarks[4] = Integer.parseInt(JOptionPane.showInputDialog("What is the mark for your fifth course?"));

                                // Stores total mark

                                int total = 0;

                                // Calculate total

                                for(int i = 0; i < 5; i++)

                                                total += studentMarks[i];

                                // Determine average

                                average = (double)total / 5;

                                // For loop cycles through the five marks

                                for(int i = 0; i < 5; i++)

                                                // Nested for loop checks each letter grade range

                                                for(int j = 1; j < 15; j++)

                                                                // If the mark is in the correct range

                                                                if(studentMarks[i] < letterMarks[j - 1] && studentMarks[i] >= letterMarks[j]) {

                                                                                // Assign the letter to the studentLetters array

                                                                                studentLetters[i] = letterGrades[j];

                                                                                // Increment the letterCount entry

                                                                                letterCount[j]++;

                                                                }

                                // Output student name and ID

                                System.out.println("Name: " + studentName + "\t\tID: " + studentID + "\n");

                                // Print marks and letters for each course

                                for(int i = 0; i < 5; i++)

                                                System.out.println("Mark for course " + (i + 1) + ": " + studentMarks[i]

                                                                                                                                + "% (" + studentLetters[i] + ")");

                                // Format the average

                                DecimalFormat numFormat = new DecimalFormat("0.00");

                                // Print average

                                System.out.println("\nThe average is " + numFormat.format(average));

                                System.out.println("\nThe following is a break down of marks by letter grade:");

                                // Print letter break down

                                for(int i = 1; i < 15; i++)

                                                if(letterCount[i] > 0)

                                                                System.out.println(letterCount[i] + " x " + letterGrades[i]);

                                // Exit program

                                System.exit(0);

                }

}

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