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  1. // Marvyn Jesse De La Torre       CS1A       Chapter 7, pg. 446, #9
  2. //
  3. /****************************************************************************
  4.  * GRADE THE DRIVER'S LICENSE EXAM
  5.  *
  6.  * This program accepts and compares a student's answers to the correct answers for a
  7.  * 20-question driver's license exam. It displays whether the student passed
  8.  * or failed, the number of correct and incorrect answers, and the question
  9.  * numbers answered incorrectly.
  10.  *
  11.  * INPUT
  12.  *   studentAnswers   // The student's answers to the 20 questions
  13.  *
  14.  * OUTPUT
  15.  *   correctCount     // Number of correct answers
  16.  *   incorrectCount   // Number of incorrect answers
  17.  *   missedQuestions  // Question numbers answered incorrectly
  18.  *   examResult       // Whether the student passed or failed
  19.  ****************************************************************************/
  20.  
  21. #include <iostream>
  22. #include <cctype>
  23. using namespace std;
  24.  
  25. int main()
  26. {
  27.     const int QUESTIONS = 20;
  28.     const int PASSING_SCORE = 15;
  29.  
  30.     // Store the correct answers for the exam.
  31.     const char correctAnswers[QUESTIONS] =
  32.     {
  33.         'B', 'D', 'A', 'A', 'C',
  34.         'A', 'B', 'A', 'C', 'D',
  35.         'B', 'C', 'D', 'A', 'D',
  36.         'C', 'C', 'B', 'D', 'A'
  37.     };
  38.  
  39.     char studentAnswers[QUESTIONS];
  40.     int correctCount = 0;
  41.     int incorrectCount = 0;
  42.  
  43.     // Get and validate the student's answer to each question.
  44.     for (int i = 0; i < QUESTIONS; i++)
  45.     {
  46.         cout << "Enter the answer for question " << i + 1
  47.              << " (A, B, C, or D): ";
  48.         cin >> studentAnswers[i];
  49.         studentAnswers[i] = toupper(studentAnswers[i]);
  50.  
  51.         while (cin.fail() ||
  52.                (studentAnswers[i] != 'A' &&
  53.                 studentAnswers[i] != 'B' &&
  54.                 studentAnswers[i] != 'C' &&
  55.                 studentAnswers[i] != 'D'))
  56.         {
  57.             cout << "Invalid answer. Enter A, B, C, or D: ";
  58.             cin.clear();
  59.             cin >> studentAnswers[i];
  60.             studentAnswers[i] = toupper(studentAnswers[i]);
  61.         }
  62.  
  63.         // Compare the student's answer with the correct answer.
  64.         if (studentAnswers[i] == correctAnswers[i])
  65.         {
  66.             correctCount++;
  67.         }
  68.         else
  69.         {
  70.             incorrectCount++;
  71.         }
  72.     }
  73.  
  74.     // Display the exam result and number of correct and incorrect answers.
  75.     cout << "\nDriver's License Exam Results\n";
  76.     cout << "------------------------------\n";
  77.     cout << "Correct answers: " << correctCount << endl;
  78.     cout << "Incorrect answers: " << incorrectCount << endl;
  79.  
  80.     if (correctCount >= PASSING_SCORE)
  81.     {
  82.         cout << "Result: Passed\n";
  83.     }
  84.     else
  85.     {
  86.         cout << "Result: Failed\n";
  87.     }
  88.  
  89.     // Display the question numbers that were answered incorrectly.
  90.     cout << "\nQuestions answered incorrectly: ";
  91.     if (incorrectCount == 0)
  92.     {
  93.         cout << "None";
  94.     }
  95.     else
  96.     {
  97.         for (int i = 0; i < QUESTIONS; i++)
  98.         {
  99.             if (studentAnswers[i] != correctAnswers[i])
  100.             {
  101.                 cout << i + 1 << " ";
  102.             }
  103.         }
  104.     }
  105.     cout << endl;
  106.  
  107.     return 0;
  108. }
Success #stdin #stdout 0s 5320KB
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Enter the answer for question 1 (A, B, C, or D): Enter the answer for question 2 (A, B, C, or D): Enter the answer for question 3 (A, B, C, or D): Enter the answer for question 4 (A, B, C, or D): Enter the answer for question 5 (A, B, C, or D): Enter the answer for question 6 (A, B, C, or D): Enter the answer for question 7 (A, B, C, or D): Enter the answer for question 8 (A, B, C, or D): Enter the answer for question 9 (A, B, C, or D): Enter the answer for question 10 (A, B, C, or D): Enter the answer for question 11 (A, B, C, or D): Enter the answer for question 12 (A, B, C, or D): Enter the answer for question 13 (A, B, C, or D): Enter the answer for question 14 (A, B, C, or D): Enter the answer for question 15 (A, B, C, or D): Enter the answer for question 16 (A, B, C, or D): Enter the answer for question 17 (A, B, C, or D): Enter the answer for question 18 (A, B, C, or D): Enter the answer for question 19 (A, B, C, or D): Enter the answer for question 20 (A, B, C, or D): 
Driver's License Exam Results
------------------------------
Correct answers: 20
Incorrect answers: 0
Result: Passed

Questions answered incorrectly: None
https://ideone.com/J8fR1b
language:
C++ (gcc 8.3)
created:
17 hours ago
visibility:
public

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