Compilare: main.cpp: In function 'int main()': main.cpp:16:40: warning: 'aux.point::y' may be used uninitialized in this function [-Wmaybe-uninitialized] double arie=(a.x*(b.y-c.y)-b.x*(a.y-c.y)+c.x*(a.y-b.y))/2; ~~~~^~~~~ main.cpp:60:15: note: 'aux.point::y' was declared here point aux; ^~~ main.cpp:16:49: warning: 'aux.point::x' may be used uninitialized in this function [-Wmaybe-uninitialized] double arie=(a.x*(b.y-c.y)-b.x*(a.y-c.y)+c.x*(a.y-b.y))/2; ~~~^~~~~~~~~~ main.cpp:60:15: note: 'aux.point::x' was declared here point aux; ^~~