Compilare: user.cpp: In function ‘int main()’: user.cpp:40:17: warning: ‘y2’ may be used uninitialized in this function [-Wmaybe-uninitialized] s=s+x1*x2+y1*y2; ^ user.cpp:40:17: warning: ‘y1’ may be used uninitialized in this function [-Wmaybe-uninitialized] user.cpp:40:11: warning: ‘x2’ may be used uninitialized in this function [-Wmaybe-uninitialized] s=s+x1*x2+y1*y2; ^ user.cpp:40:11: warning: ‘x1’ may be used uninitialized in this function [-Wmaybe-uninitialized]