Java Program Suppose a student was taking 5 different courses last semester. Wri

ID: 3783927 • Letter: J

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,

(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("**********************************************");

}

Explanation / Answer

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 + " ID: " + studentID + " ");

// 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(" The average is " + numFormat.format(average));

System.out.println(" The 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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