Drivers License Exam Java Program

Drivers License Exam Java Program | In this section, we write the code for the driver’s license exam in Java.

Program Description:- The local Driver’s License Office has asked you to write a program that grades the written portion of the license exam. In the exam, there is a total of 20 questions where the student is required to answer at least 15 correct answers to pass the exam, else he/she is termed as fail. 

These are usually multiple-choice questions that have four options ‘A’, ‘B’, ‘C’,’ D’  the student should select any one of these. 

import java.util.ArrayList;
import java.util.List;

public class DriverExam {
   
   // correct answers
   private char ansKey[] = 
                  { 'B', 'D', 'A', 'A', 'C', 
                    'A', 'B', 'A', 'C', 'D', 
                    'B', 'C', 'D', 'A', 'D', 
                    'C', 'C', 'B', 'D', 'A' };

   // array to store user answers
   private char userAns[] = new char[ansKey.length];
   private double passing = 65.0;

   // constructor
   public DriverExam(char[] userAns) {
      this.userAns = userAns;
   }

   // method to check whether user is passed or not
   public boolean passed() {
      double percentage = (totalCorrectAns()*100) / ansKey.length;
      return (percentage >= passing);
   }

   // method to count total correct answers
   public int totalCorrectAns() {
      int countCorrect = 0;
      for (int i = 0; i < userAns.length; i++) {
         if (userAns[i] == ansKey[i]) {
            countCorrect++;
         }
      }
      return countCorrect;
   }

   // method to count total incorrect answers
   public int totalIncorrectAns() {
      int countIncorrectAns = 0;
      for (int i = 0; i < userAns.length; i++) {
         if (userAns[i] != ansKey[i]) {
            countIncorrectAns++;
         }
      }
      return countIncorrectAns;
   }

   // method to return array of questions 
   // having incorrect answers
   public int[] questionsMissed() {
      List<Integer> missedQuestions = new ArrayList<Integer>();
      for (int i = 0; i < userAns.length; i++) {
         if (userAns[i] != ansKey[i]) {
            missedQuestions.add(i + 1);
         }
      }
      int questions[] = new int[missedQuestions.size()];
      for(int i=0; i<questions.length; i++) {
         questions[i] = missedQuestions.get(i);
      }
      return questions;
   }
}

import java.util.Arrays;
import java.util.Scanner;

public class Application {
   public static void main(String[] args) {
      System.out.println("******************"
             +"********************************");
      System.out.println("****Driver's License Exam****");
      System.out.println("20 Multiple-Choice Questions");
      System.out.println("Answer in A, B, C, D\n");
      System.out.println("******************"
             +"********************************");

      Scanner scan = new Scanner(System.in);
      char studentAns[] = new char[20];
      System.out.println("Enter the answer of the " +
                         "following questions:- ");
      for (int i = 0; i < studentAns.length; i++) {
         System.out.print((i + 1) + ": ");
         studentAns[i] = scan.nextLine().charAt(0);
      }

      // create object
      DriverExam exam = new DriverExam(studentAns);

      System.out.println("\n******************"
             +"********************************");
      System.out.println("Results:- ");
      System.out.println("Total correct answers: " 
                         + exam.totalCorrectAns());
      System.out.println("Total incorrect answers: " 
                         + exam.totalIncorrectAns());

      int[] missedQuestions = exam.questionsMissed();
      if (missedQuestions.length != 0) {
         System.out.print("The following questions " + 
                          "have incorrect answers: ");
         System.out.println(Arrays.toString(missedQuestions));
      } else {
         System.out.println("All answers are corrects");
      }

      System.out.println("Passing is at 65%");
      if (exam.passed()) {
         System.out.print("Congratulations, " 
                          + "You have passed the exam!");
      } else {
         System.out.print("You failed. Better luck next time.");
      }
   }
}

Output:-

**************************************************
****Driver’s License Exam****
20 Multiple-Choice Questions
Answer in A, B, C, D

**************************************************
Enter the answer of the following questions:-
1: B
2: D
3: A
4: A
5: C
6: A
7: B
8: A
9: A
10: D
11: B
12: C
13: D
14: A
15: A
16: C
17: C
18: B
19: D
20: A

**************************************************
Results:-
Total correct answers: 18
Total incorrect answers: 2
The following questions have incorrect answers: [9, 15]
Passing is at 65%
Congratulations, You have passed the exam!

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