inheritance.cpp

/// Requirement: print the area of the given shape
void print_area(const Shape &shape)
{
    std::cout << shape.get_area() << std::endl;
}

int main(){
 std::vector<std::unique_ptr<Shape>> shapes;
    shapes.push_back(std::make_unique<Circle>(10));
    shapes.push_back(std::make_unique<Circle>(11.0));
    shapes.push_back(std::make_unique<Rectangle>(10.0, 20.0));
    shapes.push_back(std::make_unique<Rectangle>(1.0, 0.5));
    for (auto &s : shapes)
    {
        print_area(*s);
    }
}