Compilare: user.cpp: In function ‘int get_int()’: user.cpp:19:19: warning: array subscript has type ‘char’ [-Wchar-subscripts] while (buff[dr]<'0' || buff[dr]>'9') ^ user.cpp:19:35: warning: array subscript has type ‘char’ [-Wchar-subscripts] while (buff[dr]<'0' || buff[dr]>'9') ^ user.cpp:26:19: warning: array subscript has type ‘char’ [-Wchar-subscripts] while (buff[dr]>='0' && buff[dr]<='9') ^ user.cpp:26:36: warning: array subscript has type ‘char’ [-Wchar-subscripts] while (buff[dr]>='0' && buff[dr]<='9') ^ user.cpp:28:29: warning: array subscript has type ‘char’ [-Wchar-subscripts] nr = nr*10 + buff[dr] - '0'; ^