Compilare: user.cpp: In member function ‘int Polygon::point_inside_polygon(POINT2D)’: user.cpp:139:29: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if (p.y >= points[i].y && p.y <= points[i + 1].y || p.y >= points[i + 1].y && p.y <= points[i].y) ^ user.cpp:153:28: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if (p.y >= points[1].y && p.y <= points[number_points].y || p.y >= points[number_points].y && p.y <= points[1].y) ^ user.cpp: In member function ‘void Polygon::trigonometric_order()’: user.cpp:220:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0;i < stack.size();++i) ^