Compilare: user.cpp:44:2: warning: no newline at end of file user.cpp: In function 'int main()': user.cpp:26: warning: comparison between signed and unsigned integer expressions user.cpp:30: warning: comparison between signed and unsigned integer expressions user.cpp:37: warning: comparison between signed and unsigned integer expressions user.cpp:18: warning: 'ult' may be used uninitialized in this function