Compilare: user.cpp: In function ‘int main()’: user.cpp:34:27: warning: ‘c’ may be used uninitialized in this function [-Wmaybe-uninitialized] g << b << '\n' << c << '\n' << f1; ^ user.cpp:40:27: warning: ‘b’ may be used uninitialized in this function [-Wmaybe-uninitialized] g << a << '\n' << b << '\n' << f1; ^ user.cpp:40:14: warning: ‘a’ may be used uninitialized in this function [-Wmaybe-uninitialized] g << a << '\n' << b << '\n' << f1; ^