Compilare: user.cpp:93:3: warning: no newline at end of file user.cpp: In function 'int main()': user.cpp:13: warning: comparison between signed and unsigned integer expressions user.cpp:23: warning: comparison between signed and unsigned integer expressions user.cpp:24: warning: comparison between signed and unsigned integer expressions user.cpp:51: warning: comparison between signed and unsigned integer expressions user.cpp:65: warning: comparison between signed and unsigned integer expressions user.cpp:74: warning: suggest parentheses around assignment used as truth value