Compilare: user.cpp: In function 'void read()': user.cpp:56: warning: format '%ld' expects type 'long int*', but argument 2 has type 'long long unsigned int*' user.cpp:58: warning: comparison between signed and unsigned integer expressions user.cpp:59: warning: format '%ld' expects type 'long int*', but argument 2 has type 'long long unsigned int*'