Compilare: user.cpp: In function ‘int main()’: user.cpp:73:16: warning: variable ‘lefti’ set but not used [-Wunused-but-set-variable] int start,end,lefti,righti,top,bot; ^ user.cpp:73:22: warning: variable ‘righti’ set but not used [-Wunused-but-set-variable] int start,end,lefti,righti,top,bot; ^ user.cpp:73:29: warning: variable ‘top’ set but not used [-Wunused-but-set-variable] int start,end,lefti,righti,top,bot; ^ user.cpp:73:33: warning: variable ‘bot’ set but not used [-Wunused-but-set-variable] int start,end,lefti,righti,top,bot; ^