Score calculation

Learn correct count with the score calculation method.

Score calculation

Now we add score tracking to the Quiz class. An int score member is kept and incremented in run() for each question. A getScore() method returns the score.

Example: int score = 0; member variable. In run() we do score++; for each question. int getScore() { return score; } reads the score. In main we write std::cout << "Score: " << quiz.getScore();. In this example every question counts as correct, so the score equals the question count.

Score and member variable

The score member variable is part of the Quiz class. It increments each time run() is called; the object carries this state.

In this design score adds one point per question. A real quiz would check answers; but since this project has no input reading, we count every question as correct. The getScore() method exposes the score. This way we can print the result when the quiz is done.

Exercise Add score tracking to Quiz

Take the previous lesson's Quiz class. After the questions member add int score = 0;. In run() after the std::cout line add score++;. Under public: add int getScore() with body return score;. In main after quiz.run(); add std::cout << "Score: " << quiz.getScore();.

Show example solution

#include <iostream>
#include <string>
#include <vector>

struct Question {
    std::string text;
    std::string answer;
};

class Quiz {
public:
    std::vector<Question> questions;
    int score = 0;
    void addQuestion(std::string text, std::string answer) {
        questions.push_back({text, answer});
    }
    void run() {
        for (const auto& q : questions) {
            std::cout << "Question: " << q.text << std::endl;
            score++;
        }
    }
    int getScore() {
        return score;
    }
};

int main() {
    Quiz quiz;
    quiz.addQuestion("Capital?", "Ankara");
    quiz.addQuestion("Largest planet?", "Jupiter");
    std::cout << "Quiz ready" << std::endl;
    std::cout << quiz.questions.size() << " questions added" << std::endl;
    quiz.run();
    std::cout << "Score: " << quiz.getScore();
    return 0;
}

Test yourself

What does getScore() return?
```
int getScore() { return score; }
```
- The question count
- The vector
- The score
- An empty value
Show answer

The score — getScore() returns the value of the score member.
Match each piece to its role

int score

Score member
score++

Increment
getScore()

Score reading
return score

Return value

Complete the score member variable

class Quiz { public: std::vector<Question> questions; int ____ = 0; };

Show answer

class Quiz { public: std::vector<Question> questions; int score = 0; };

Next lesson: Putting it together

We Are Enhancing Your Experience

Cookie Preferences

Strictly Necessary Cookies

Analytical Cookies