Question

Introducing JOptionPane.

The Learning Goal for this exercise is to interact with a user with JOptionPane and use that instead of Scanner for user input and output.

PowerShell or Terminal is not a standard way that users interact with programs. Windows and dialog boxes are very natural. JOptionPane will allow you to get information to and from a user.

Create a Calculator that will calculate the grade in this course.

_Create a Java Program that can calculate your final grade based on:

_Attendance 10% (In order to receive any attendance credit, you must earn at least 6 of the 10 points.), Weekly quizzes 10%, weekly class assignments 10%, lab 10%, project1 20%,project 2 20%, homework 40% ...The grading scale expected to be used is: A >= 90% > B >= 80% > C >= 70% > D >= 60% > F... Late work will receive a 30% reduction.

_Use a dialog box to welcome the user and tell them what the program does.

_For Attendance, enter the points earned, from 0-13, but follow the rules for no points if less than 6 points are earned.

_For gather quizzes, use the average of the quizzes from 0-10

_For all other categories, use a 0-100 scale for the total grade in that category (not individual grades) and then weight it just as described in the syllabus.

_Each click of OK will enter the grade being asked for and move to the next grade.

_When asking for a grade, include what the grade is for and then give the expected range as an example.

_After all grades are entered, display the numeric grade with 2 decimal places. example 92.54 and the letter grade earned.

_Accept user input and display output through JOptionPanes - do not use System.out.print...

_Use the javac command to compile your code.

_Use the java command to evaluate the results of your code.

Answer 1

There seems to be a problem with the percentage in the given problem (all the percentages add to 110%).

But, the solution in java source code is given below:-

//----------------------------------------------------------------------------------------------------------------------------------------------

import java.lang.*;
import javax.swing.JOptionPane;

public final class Grades
{
   public static void main(String[]args)
   {
       int reply=0; // this variable stores whether the submission was late
       int attd = 0; // the attendance points (from 0 to 13)
       int quiz = 0; // the average points for quizzes (from 0 to 10)
       float assign = 0; // the average marks for assignments (from 0 to 100)
       float lab = 0; // the average marks for laboratory experiments (from 0 to 100)
       float proj1 = 0; // the average marks for first project (from 0 to 100)
       float proj2 = 0; // the average marks for second project (from 0 to 100)
       float homew = 0; // the average marks for homework (from 0 to 100)
       float marks=0; // total marks
       char grade='X'; // overall grade
       // Welcome the user and display what the program does
       JOptionPane.showMessageDialog(null,"Welcome!\n This program various marks & points as input\n and then displays overall marks and grade.");
       // taking inputs
           attd = Integer.parseInt(JOptionPane.showInputDialog("Enter Attendance(0-13):-"));
           quiz = Integer.parseInt(JOptionPane.showInputDialog("Enter Average of Quizzes(0-10):-"));
           assign = Float.parseFloat(JOptionPane.showInputDialog("Enter the Percentage of Assignments:-"));
lab = Float.parseFloat(JOptionPane.showInputDialog("Enter the Percentage of Marks in Laboratory:-"));
  
           proj1 = Float.parseFloat(JOptionPane.showInputDialog("Enter the Percentage of First Project:-"));
  
           proj2 = Float.parseFloat(JOptionPane.showInputDialog("Enter the Percentage of Second Project:-"));
  
           homew = Float.parseFloat(JOptionPane.showInputDialog("Enter the Percentage of Homeworks:-"));

       reply = JOptionPane.showConfirmDialog(null,"Was any of the Submission late?", "LateSubmission", JOptionPane.YES_NO_OPTION);
       // the calculations of total marks is below:-
       if(attd>=6) // attendance points are only awarded if there are more than 6 points
           marks += attd*(10/13); // 10% of attendance
       marks += quiz; // 10% of quiz
       marks += assign*0.1; // 10% of assignments
       marks += lab*0.1; // 10% of lab
       marks += proj1*0.2; // 20% of first project
       marks += proj2*0.2; // 20% of second project
       marks += homew*0.4; // 40% of home work
       if(reply == JOptionPane.YES_OPTION) // if the submission was late
       {
           marks -= 30;
}
       // assigning a grade
       if(marks>=90)
       {
           grade = 'A';
       }
       else if(marks>=80)
       {
           grade = 'B';
       }
       else if(marks>=70)
       {
           grade = 'C';
       }
       else if(marks>=60)
       {
           grade = 'D';
       }
       else
       {
           grade = 'F';
       }
       // showing output
       JOptionPane.showMessageDialog(null,"Total Marks: "+marks+" %\nTotal Grade: "+grade);
   }
}

//------------------------------------------------------------------------------------------------------------------------------------

// To compile this class simply save it with filename 'Grades.java'.

// Then change the directory to the location of the source file.

// Then type:-

// javac Grades.java

//---------------------------------------------------------------------------------------------------------------------------------------

// To run this program type:-

// java Grades