Compilare: user.cpp: In function ‘void magic()’: user.cpp:116:15: warning: variable ‘p1’ set but not used [-Wunused-but-set-variable] point p1=it->p; ^ user.cpp:117:15: warning: variable ‘p2’ set but not used [-Wunused-but-set-variable] point p2=it1->p; ^ user.cpp:102:10: warning: unused variable ‘ok’ [-Wunused-variable] bool ok; ^ user.cpp: In function ‘void read()’: user.cpp:152:12: warning: unused variable ‘x’ [-Wunused-variable] double x,y; ^ user.cpp:152:14: warning: unused variable ‘y’ [-Wunused-variable] double x,y; ^