Question

USCIS has asked you to write a program that grades the practice test for the naturalization test. The
exam has 10 multiple-choice questions. Here are the correct answers:

1. B
2. D
3. A
4. A
5. C
6. A
7. B
8. A
9. C
10. D

A learner have to answer less than 2 questions wrong to pass the test.
Write a class called CivicExam that has 1) an array field, which holds the correct answers to the
exam, called keys. 2) another array field, named answers, which holds the learners’ answers. The
class should have the following methods and method headers:

1) CivicExam, constructor, that take the learner’s answers.
public CivicExam(char[] ans)

2) passed. Return true if the learner passed the test, or false if the learner failed.
public boolean passed()

3) totalIncorrect. Return the total number of incorrectly answered questions
public int totalIncorrect()

4) questionsMissed. Return an int array containing the question numbers of the questions
that the learner missed.
public int[] questionMissed ()

In this class create a main method, demonstrate the class that asks the user to enter a learner’s
answers (input validation: only accept the letters A,B,C, or D as answers), and then displayed the
results returned from the CivicExam class’s methods

Answer 1

OUTPUT

A

B
C
A
F
Please enter correct option
D
S
Please enter correct option

5
false
8

Line break represents missed questions

CivicExam.java

import java.util.Scanner;

public class CivicExam {

    private static char[] learner_answer = new char[10];
    private static char[] keys = new char[]{'B', 'D', 'A', 'A', 'C', 'A', 'B', 'A', 'C', 'D'};

    public CivicExam(char[] ans) {
        learner_answer = ans;
    }

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int counter = 0;
        while ( counter != 10 ){
            String h = scanner.nextLine();
            if(h.equals("A") || h.equals("B") || h.equals("C") || h.equals("D") || h.length() == 0){
                if( h.length() == 0 ){
                    learner_answer[counter] = ' ';
                }
                else {
                    char ans = h.charAt(0);
                    learner_answer[counter] = ans;
                }
                counter++;
            }
            else {
                System.out.println("Please enter correct option");
            }
        }
        System.out.println(questionMissed().length);
        System.out.println( passed() );
        System.out.println( totalInCorrect() );
    }

    public static int[] questionMissed() {
        int miss = 0;
        for (char c : learner_answer) {
            if (c == ' ') {
                miss++;
            }
        }
        int[] missed = new int[miss];
        int j = 0;
        for (int i = 0; i < learner_answer.length ; i++) {
            if (learner_answer[i] == ' ') {
                missed[j] = (i + 1);
                j++;
            }
        }
        return missed;
    }

    public static boolean passed() {
        int wrong = answer_check();
        return wrong < 2;
    }

    public static int totalInCorrect() {
        return answer_check();
    }

    private static int answer_check() {
        int wrong = 0;
        for (int i = 0; i < learner_answer.length; i++) {
            if (learner_answer[i] != keys[i]) {
                wrong++;
            }
        }
        return wrong;
    }
}