Compilare: user.cpp: In function 'int main()': user.cpp:8: warning: unused variable 'x' user.cpp:8: warning: unused variable 'y' user.cpp:8: warning: unused variable 'xx' user.cpp:8: warning: unused variable 'yy' user.cpp:9: warning: unused variable 'dx' user.cpp:9: warning: unused variable 'dy' user.cpp:10: warning: unused variable 'p' user.cpp:10: warning: unused variable 't' user.cpp:10: warning: unused variable 'r' user.cpp:10: warning: 'q' may be used uninitialized in this function /tmp/ccKi2VHA.o: In function `main': user.cpp:(.text+0x86): warning: the `gets' function is dangerous and should not be used.