Compilare: user.cpp: In function 'int main()': user.cpp:43: warning: comparison between signed and unsigned integer expressions user.cpp:46: warning: comparison between signed and unsigned integer expressions user.cpp:56: warning: comparison between signed and unsigned integer expressions user.cpp:62: warning: comparison between signed and unsigned integer expressions user.cpp:29: warning: 'q' may be used uninitialized in this function user.cpp:29: warning: 'p' may be used uninitialized in this function