Question

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

Answer 1

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).