Compilare: user.cpp: In function ‘std::vector<Point> IntersectCircles(const Circle&, const Circle&)’: user.cpp:21:20: warning: ‘x1’ may be used uninitialized in this function [-Wmaybe-uninitialized] this->x = x; ^ user.cpp:93:20: note: ‘x1’ was declared here double x0, x1, y0, y1; ^ user.cpp:21:20: warning: ‘x0’ may be used uninitialized in this function [-Wmaybe-uninitialized] this->x = x; ^ user.cpp:93:16: note: ‘x0’ was declared here double x0, x1, y0, y1; ^ user.cpp:22:20: warning: ‘y1’ may be used uninitialized in this function [-Wmaybe-uninitialized] this->y = y; ^ user.cpp:89:32: note: ‘y1’ was declared here double x = -c / a, y0, y1; ^ user.cpp:22:20: warning: ‘y0’ may be used uninitialized in this function [-Wmaybe-uninitialized] this->y = y; ^ user.cpp:89:28: note: ‘y0’ was declared here double x = -c / a, y0, y1; ^