C++ Mini Projects: Online Quiz Creator

With the help of this project, users can create, save, and implement quizzes. The quizzes contain multiple-choice questions, and the program calculates scores after a user attempts a quiz. Quizzes are reusable as they are stored in files. So let's build it.

Skills Used

• File handling: To save and load quiz data.
• Vectors: For storing and handling quiz data.
• Conditional statements: For checking answers and calculating scores.
• Functions: For organizing code to create, take, and manage quizzes.

The code to build the desired project

#include <iostream>
#include <fstream>
#include <vector>
#include <string>
#include <sstream>
using namespace std;

// Structure to represent a question
struct Question {
    string questionText;
    vector<string> options;
    int correctAnswer; // Index of the correct answer (0-based)
};

// Function to display the main menu
void displayMenu() {
    cout << "\n--- Online Quiz Creator ---\n";
    cout << "1. Create a Quiz\n";
    cout << "2. Take a Quiz\n";
    cout << "3. Exit\n";
    cout << "Choose an option: ";
}

// Function to create a new quiz
void createQuiz(const string& filename) {
    vector<Question> quiz;
    int numQuestions;

    cout << "Enter the number of questions: ";
    cin >> numQuestions;
    cin.ignore(); // Clear input buffer

    for (int i = 0; i < numQuestions; ++i) {
        Question q;
        cout << "\nEnter question " << (i + 1) << ": ";
        getline(cin, q.questionText);

        cout << "Enter the number of options: ";
        int numOptions;
        cin >> numOptions;
        cin.ignore(); // Clear input buffer

        for (int j = 0; j < numOptions; ++j) {
            string option;
            cout << "Enter option " << (j + 1) << ": ";
            getline(cin, option);
            q.options.push_back(option);
        }

        cout << "Enter the number of the correct answer (1 to " << numOptions << "): ";
        cin >> q.correctAnswer;
        q.correctAnswer--; // Convert to 0-based index
        cin.ignore(); // Clear input buffer

        quiz.push_back(q);
    }

    // Save quiz to file
    ofstream file(filename, ios::app);
    if (file) {
        for (const auto& q : quiz) {
            file << q.questionText << "\n";
            for (const auto& option : q.options) {
                file << option << "\n";
            }
            file << q.correctAnswer << "\n";
            file << "-----\n"; // Separator between questions
        }
        file.close();
        cout << "Quiz saved successfully!\n";
    } else {
        cout << "Error saving quiz to file.\n";
    }
}

// Function to take a quiz
void takeQuiz(const string& filename) {
    ifstream file(filename);
    if (!file) {
        cout << "No quizzes available. Create one first.\n";
        return;
    }

    vector<Question> quiz;
    string line;

    // Load quiz from file
    while (getline(file, line)) {
        if (line == "-----") continue;

        Question q;
        q.questionText = line;

        while (getline(file, line) && line != "-----") {
            if (isdigit(line[0])) { // If the line contains the correct answer
                q.correctAnswer = stoi(line);
                break;
            }
            q.options.push_back(line);
        }

        quiz.push_back(q);
    }
    file.close();

    // Conduct the quiz
    if (quiz.empty()) {
        cout << "No questions available in the quiz.\n";
        return;
    }

    int score = 0;
    for (size_t i = 0; i < quiz.size(); ++i) {
        const auto& q = quiz[i];
        cout << "\nQuestion " << (i + 1) << ": " << q.questionText << "\n";
        for (size_t j = 0; j < q.options.size(); ++j) {
            cout << j + 1 << ". " << q.options[j] << "\n";
        }

        int answer;
        cout << "Your answer: ";
        cin >> answer;

        if (answer - 1 == q.correctAnswer) {
            cout << "Correct!\n";
            score++;
        } else {
            cout << "Wrong. Correct answer: " << q.correctAnswer + 1 << "\n";
        }
    }

    cout << "\nQuiz finished! Your score: " << score << "/" << quiz.size() << "\n";
}

int main() {
    const string filename = "quiz.txt";
    int choice;

    do {
        displayMenu();
        cin >> choice;

        switch (choice) {
        case 1:
            createQuiz(filename);
            break;
        case 2:
            takeQuiz(filename);
            break;
        case 3:
            cout << "Exiting program. Goodbye!\n";
            break;
        default:
            cout << "Invalid choice. Try again.\n";
        }
    } while (choice != 3);

    return 0;
}

Real-World Applications

Education Sector

• Universities and schools can use similar software to create automatic quiz tests, reducing manual grading efforts.

Corporate Training

• Companies can implement quizzes to assess employee knowledge and provide training through interactive tests.

Online Learning Platforms

• Websites like Udemy and Coursera use quizzes to enhance learning and engagement.

Case Studies

University Online Exam System

A local university automated quiz-based testing using a C++ system integrated with a database to analyze student performance.

Employee Skills Assessment

A tech company implemented a quiz-based evaluation system to assess employee skills in advanced technologies before project assignments.

Problem-Solving Approaches

• Efficiently handling large quizzes: Using databases or structured files to manage extensive quizzes.
• Preventing cheating: Implementing timers and randomizing questions.
• Improving user experience: Incorporating intuitive GUIs with frameworks like Qt.