Compilare: user.cpp: In function 'int main()': user.cpp:56: warning: use of 'll' length modifier with 'f' type character user.cpp:59: warning: use of 'll' length modifier with 'f' type character user.cpp:62: warning: use of 'll' length modifier with 'f' type character user.cpp:71: warning: use of 'll' length modifier with 'f' type character user.cpp:115: warning: use of 'll' length modifier with 'f' type character user.cpp:53: warning: unused variable 'N'