Compilare: user.cpp: In function 'int main()': user.cpp:54: warning: comparison between signed and unsigned integer expressions user.cpp:70: warning: comparison between signed and unsigned integer expressions user.cpp:17: warning: unused variable 'p' user.cpp:17: warning: unused variable 'q' user.cpp:35: warning: 'dy' may be used uninitialized in this function user.cpp:35: warning: 'dx' may be used uninitialized in this function