Compilare: user.cpp:72:2: warning: no newline at end of file user.cpp: In function 'long int zero()': user.cpp:21: warning: control reaches end of non-void function user.cpp: In function 'long int unu()': user.cpp:24: warning: 'nr' may be used uninitialized in this function user.cpp: In function 'long int doi()': user.cpp:41: warning: 'nr' may be used uninitialized in this function