Compilare: user.cpp:97:3: warning: no newline at end of file user.cpp: In function 'int main()': user.cpp:14: warning: comparison between signed and unsigned integer expressions user.cpp:24: warning: comparison between signed and unsigned integer expressions user.cpp:25: warning: comparison between signed and unsigned integer expressions user.cpp:53: warning: comparison between signed and unsigned integer expressions user.cpp:69: warning: comparison between signed and unsigned integer expressions user.cpp:78: warning: suggest parentheses around assignment used as truth value