Compilare: user.cpp: In function ‘int main()’: user.cpp:55:27: warning: unused variable ‘x1’ [-Wunused-variable] double mijx,mijy,dx,dy,x1,x2,y1,y2; ^ user.cpp:55:30: warning: unused variable ‘x2’ [-Wunused-variable] double mijx,mijy,dx,dy,x1,x2,y1,y2; ^ user.cpp:55:33: warning: unused variable ‘y1’ [-Wunused-variable] double mijx,mijy,dx,dy,x1,x2,y1,y2; ^ user.cpp:55:36: warning: unused variable ‘y2’ [-Wunused-variable] double mijx,mijy,dx,dy,x1,x2,y1,y2; ^