Compilare: user.cpp: In function 'int main()': user.cpp:31: warning: format '%u' expects type 'unsigned int*', but argument 3 has type 'long unsigned int*' user.cpp:31: warning: format '%u' expects type 'unsigned int*', but argument 3 has type 'long unsigned int*' user.cpp:33: warning: comparison between signed and unsigned integer expressions user.cpp:51: warning: format '%d' expects type 'int', but argument 3 has type 'long unsigned int'