Compilare: main.cpp: In function 'int main()': main.cpp:121:63: warning: 'points.Rectangle::x2' may be used uninitialized in this function [-Wmaybe-uninitialized] out << points.x1 << " " << points.y1 << " " << points.x2 << " " << points.y2 << "\n"; ^~~ main.cpp:121:23: warning: 'points.Rectangle::x1' may be used uninitialized in this function [-Wmaybe-uninitialized] out << points.x1 << " " << points.y1 << " " << points.x2 << " " << points.y2 << "\n"; ^~~ main.cpp:121:83: warning: 'points.Rectangle::y2' may be used uninitialized in this function [-Wmaybe-uninitialized] out << points.x1 << " " << points.y1 << " " << points.x2 << " " << points.y2 << "\n"; ^~~~ main.cpp:121:43: warning: 'points.Rectangle::y1' may be used uninitialized in this function [-Wmaybe-uninitialized] out << points.x1 << " " << points.y1 << " " << points.x2 << " " << points.y2 << "\n"; ^~~