Compilare: user.cpp: In function 'int main()': user.cpp:18: warning: format '%d' expects type 'int*', but argument 3 has type 'long unsigned int*' user.cpp:36: warning: comparison between signed and unsigned integer expressions user.cpp:37: warning: comparison between signed and unsigned integer expressions user.cpp:40: warning: comparison between signed and unsigned integer expressions user.cpp:41: warning: comparison between signed and unsigned integer expressions