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7. Test Average and Grade Write a program that asks the user to enter five test scores. The program should display a letter grade for each score and the average test score. Write the following methods in the program: calcAverage: This method should accept five test scores as arguments and return the average of the scores. determineGrade: This method should accept a test score as an argument and return a letter grade for the score, based on the following grading scale: Score Letter Grade 90-100 A 80-89 B 70-79 C 60-69 D Below 60 F

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Answer:

The code solution is written in Java.

  1. import java.util.Scanner;
  3. public class TestScore {
  5.    public static void main(String[] args) {
  7.        Scanner input = new Scanner(System.in);
  9.        System.out.print("Please enter first score: ");
  10.        double firstScore = input.nextDouble();
  11.        System.out.println("Grade: " + determineGrade(firstScore));
  13.        System.out.print("Please enter second score: ");
  14.        double secondScore = input.nextDouble();
  15.        System.out.println("Grade: " + determineGrade(secondScore));
  17.        System.out.print("Please enter third score: ");
  18.        double thirdScore = input.nextDouble();
  19.        System.out.println("Grade: " + determineGrade(thirdScore));
  21.        System.out.print("Please enter fourth score: ");
  22.        double fourthScore = input.nextDouble();
  23.        System.out.println("Grade: " + determineGrade(fourthScore));
  25.        System.out.print("Please enter fifth score: ");
  26.        double fifthScore = input.nextDouble();
  27.        System.out.println("Grade: " + determineGrade(fifthScore));
  29.        System.out.println("Average score: " + calcAverage(firstScore, secondScore, thirdScore, fourthScore, fifthScore));
  31.    }
  33.    public static double calcAverage(double score1, double score2, double score3, double score4, double score5){
  34.        double average = (score1 + score2 + score3 + score4 + score5) / 5;
  35.        return average;
  36.    }
  38.    public static String determineGrade(double score){
  39.        if(score >= 90){
  40.            return "A";
  41.        }
  42.        else if(score >= 80 ){
  43.            return "B";
  44.        }
  45.        else if(score >=70){
  46.            return "C";
  47.        }
  48.        else if(score >=60){
  49.            return "D";
  50.        }
  51.        else{
  52.            return "F";
  53.        }
  54.    }
  55. }

Explanation:

Firstly, create the method, calcAverage(), that takes five test scores. Within the method, calculate the average and return it as output. (Line 33 - 36)

Next, create another method, determineGrade(), which takes only one score and return the grade based on the range of the  score. (Line 38 -54)

Once the two required methods are created, we are ready to prompt use for input five test scores using Java Scanner class. To use get user input, create a Scanner object (Line 7). Next, use getDouble() method to get an input score and assign it to variables firstScore, secondScore, thirdScore, fourthScore & fifthScore, respectively. Once a score input by user, call determineGrade() method by passing the input score as argument and immediately print out the return grade. (Line  9 - 27)

At last, call calcAverage() method by passing the first test score variables as argument and print out the returned average value. (Line 29).

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