Classes and OOP

class Course {
public:
    Course(std::string title, double price) : title_(title), price_(price) {}

    std::string describe() const {
        return title_ + " -- $" + std::to_string(price_);
    }

private:
    std::string title_;
    double price_;
};

Course c("C++ Mastery", 149.99);
std::cout << c.describe();

The constructor initializer list (: title_(title), ...) initializes members directly, which is more efficient than assigning inside the constructor body.