Question

Develop a rudimentary Java program that will allow anyone to enter any number of grades and then calculate grade point average.

For reference, a grade point average is a weighted average of a set of grades based on the relative number of credits. For example, a 1 credit “A” (4.0) should count twice as much as a .5 credit “C” (3.0), and a 1.5 credit “A+”(4.33) should count three times as much as the “C” and 1.5 times as much as the “A”.

Follow the exact specification written.

**Class GPACalculator

public GPACalculator(String title)

• provides a name for this instance of the calculator, such as “Spring 2020”

public void addGrade(double credits, double grade)

• adds the specified grade and credits to the object’s fields

public double getGPA()

• returns the (unrounded) calculated GPA

• if no grades have been entered, returns Double.POSITIVE_INFINITY

@Override

public String toString()

• returns a string representation of the calculated GPA. This method should not calculate the GPA, but should use the getGPA() method.

• returns the GPA as a string, or the string “N/A” if the GPA can’t be calculated.

Accessors--Provide accessor methods (getters) for each of the following class fields:

double getTotalCredits()

double getTotalGradePoints()

int getNumberOfGrades()

String getTitle()

**Class GPATester

public static void main(String[] args)

• creates an instance of GPACalculator and adds at least 5 grades that adequately test the calculations

• calls printResults() to clearly print all of the information available from the GPACalculator object.

• creates a second instance of GPACalculator to thoroughly test the calculations and special cases and calls printResults() to print out those values.

public static void printResults(GPACalculator gpa)

• prints a well-formatted output for the specified GPACalculator instance

• differentiates between an empty calculator and one with data by printing a message

Keep the code basic and readable. Thank you!

Answer 1

Note: Could you plz go through this code and let me know if u need any changes in this.Thank You
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// GPACalculator.java

import java.text.DecimalFormat;

public class GPACalculator {
   private String title;
   private double totalGrades;
   private double totCredits;
   private int noOfGrades;

   /**
   * @param title
   */
   public GPACalculator(String title) {
       this.title = title;
       this.totalGrades = 0.0;
       this.totCredits = 0.0;
       this.noOfGrades = 0;
   }

   public void addGrade(double credits, double grade) {
       this.totalGrades += (credits * grade);
       this.totCredits += credits;
       this.noOfGrades++;
   }

   public double getGPA() {
       if (totCredits == 0 || totalGrades == 0)
           return Double.POSITIVE_INFINITY;
       else
           return (totalGrades / totCredits);
   }

   /*
   * (non-Javadoc)
   *
   * @see java.lang.Object#toString()
   */
   @Override
   public String toString() {

       // DecimalFormat class is used to format the output
       DecimalFormat df = new DecimalFormat(".00");
       if (totCredits == 0.0 || totalGrades == 0.0)
           return "N/A";
       return "GPA : " + df.format(getGPA());
   }

   public double getTotalCredits() {
       return totCredits;
   }

   public double getTotalGradePoints() {
       return totalGrades;
   }

   public int getNumberOfGrades() {
       return noOfGrades;
   }

   /**
   * @return the title
   */
   public String getTitle() {
       return title;
   }

}

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// GPATester.java

import java.util.Scanner;

public class GPATester {

   public static void main(String[] args) {
       String title;
       double credits, grade;
       String gradeLetter;
       /*
       * Creating an Scanner class object which is used to get the inputs
       * entered by the user
       */
       Scanner sc = new Scanner(System.in);

       // Getting the input entered by the user
       /*
       * Getting the input entered by the user
       */
       System.out.print("Enter title :");
       title = sc.nextLine();

       GPACalculator gpaCalc = new GPACalculator("CMPSC 101");

       while (true) {
           System.out.print("Enter no of credits :");
           credits = sc.nextDouble();
           System.out.print("Enter Grade Letter :");
           gradeLetter = sc.next();
           grade = findGrade(gradeLetter);
          
           gpaCalc.addGrade(credits, grade);
           // Getting the character from the user 'Y' or 'y' or 'N' or 'n'
           System.out.print("\nDo you want to continue(Y/N) ::");
           char ch = sc.next(".").charAt(0);
           if (ch == 'Y' || ch == 'y')
               continue;
           else {

               break;
           }

       }

       System.out.printf("\nTotal Credits :%.2f\n" , gpaCalc.getTotalCredits());
       System.out.printf("Total Grades :%.2f\n" , gpaCalc.getTotalGradePoints());

       System.out.println(gpaCalc);

   }

   private static double findGrade(String gradeLetter) {
       double grade = 0.0;
      
       if (gradeLetter.equals("A+") || gradeLetter.equals("A") )
           grade = 4.0;
           else if (gradeLetter.equals("A-"))
               grade = 3.7;
           else if (gradeLetter.equals("B+"))
               grade = 3.3;
           else if (gradeLetter.equals("B"))
               grade = 3.0;
           else if (gradeLetter.equals("B-"))
               grade = 2.7;
           else if (gradeLetter.equals("C+"))
               grade = 2.3;
           else if (gradeLetter.equals("C"))
               grade = 2.0;
           else if (gradeLetter.equals("C-"))
               grade = 1.7;
           else if (gradeLetter.equals("D+"))
               grade = 1.3;
           else if (gradeLetter.equals("D"))
               grade = 1;
           else if (gradeLetter.equals("F"))
               grade = 0.0;
  

       return grade;
   }

}

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Output:

=====================Could you plz rate me well.Thank You