1. B 2. D 3. A 4. A 5. C 6. A 7. B 8. A 9.C 10. D 11.B 12. C 13. D 14. A 15. D 1
ID: 3764180 • Letter: 1
Question
1. B 2. D 3. A 4. A 5. C 6. A 7. B 8. A 9.C 10. D 11.B 12. C
13. D 14. A 15. D 16. C 17. C 18. B 19. D 20. A
A student must correctly answer 15 of the 20 questions to pass the exam.Write a class named DriverExam that holds the correct answers to the exam in an array field.
The class should also have an array field that holds the student’s answers. The class should have the following methods:
• result. Returns true if the student passed the exam, or false if the student failed
• CorrectAnswers. Returns the total number of correctly answered questions
• IncorrectAnswers. Returns the total number of incorrectly answered questions
• missed. An int array containing the question numbers of the questions that the student missed
Demonstrate the class in a complete program that asks the user to enter a student’s answers, and then displays the results returned from the DriverExam class’s methods. Input Validation: Only accept the letters A, B, C, or D as answers. Use basic programming loops, string and dialog boxes.
Explanation / Answer
public class DriverExam
{
//An array containing a student's answers
private String[] correctAnswers =
{"B", "D", "A", "A", "C", "A",
"B", "A", "C", "D",
"B", "C", "D", "A",
"D", "C", "C", "B", "D", "A"};
//Store the user's answers
private String[] userAnswers;
int[] missed = new int[correctAnswers.length];
//Process the user's answers
public DriverExam (String[] Answers)
{
userAnswers = new String[Answers.length];
for (int i = 0; i < Answers.length; i++)
{
userAnswers[i] = Answers[i];
}
}
//Returns a boolean value if correct answers > 15
public boolean passed()
{
if (totalCorrect() >= 15)
return true;
else
return false;
}
//Determines the total correct answers
public int totalCorrect()
{
int correctCount = 0;
for (int i = 0; i < correctAnswers.length; i++)
{
if (userAnswers[i].equalsIgnoreCase(correctAnswers[i]))
{
correctCount++;
}
}
return correctCount;
}
//Determines the total incorrect answers
public int totalIncorrect()
{
int incorrectCount = 0;
for (int i = 0; i < correctAnswers.length; i++)
{
if (!userAnswers[i].equalsIgnoreCase(correctAnswers[i]))
{
missed[incorrectCount] = i;
incorrectCount++;
}
}
return incorrectCount;
}
//Missed questions
public int[] questionsMissed()
{
return missed;
}
}
//end of DriverExam class
/* The DriverExamApplication class demonstrates the methods of DriverExam class. */
import java.util.Scanner;
public class DriverExamApplication
{
public static void main(String[] args)
{
System.out.println(" Driver's License Exam ");
Scanner input = new Scanner(System.in);
System.out.println(" 20 Multiple-Choice Questions ");
System.out.println(" Mark A, B, C, D ");
//Inputting string
String[] answers = new String[20];
String answer;
for (int i = 0; i < 20; i++)
{
do
{
System.out.print((i+1) + ": ");
answer = input.nextLine();
} while (!isValidAnswer(answer));
answers[i] = answer;
}
//Process
DriverExam exam = new DriverExam(answers);
//Results
System.out.println(" RESULTS ");
//Outputting total correct
System.out.println("Total Correct: " + exam.totalCorrect());
//Outputting total incorrect
System.out.println("Total Incorrect: " + exam.totalIncorrect());
String passed = exam.passed() ? "YES" : "NO";
//Result pass or fail
System.out.println("Passed: " + passed);
if (exam.totalIncorrect() > 0)
{
System.out.println("The incorrect answers are: ");
int missedIndex;
for (int i = 0; i < exam.totalIncorrect(); i++)
{
missedIndex = exam.questionsMissed()[i]+1;
System.out.print(" " + missedIndex);
}
}
} //end of main function
//Returns true when answer is valid
public static boolean isValidAnswer (String answer)
{
return "A".equalsIgnoreCase(answer) ||
"B".equalsIgnoreCase(answer)
|| "C".equalsIgnoreCase(answer) ||
"D".equalsIgnoreCase(answer);
}
} //end of Test class
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