Solution: Detect Narrowing Conversion

#include <iostream>
struct Point2D { 
    int x;
    int y; 
};
class Point3D {
    public:
        int x;
        int y = 1;
        int z = 2;
};
int main() {
    std::cout << '\n';
    Point2D point2D{.x = 1, .y = 2.5};
    Point3D point3D{.x = 1, .y = 2, .z = 3.5f};
    std::cout << "point2D: " << point2D.x << " " << point2D.y << " ";
    std::cout << "point3D: " << point3D.x << " " << point3D.y << " "
                             << point3D.z << '\n';
    std::cout << '\n';
}