Compilare: user.cpp: In function ‘int main()’: user.cpp:379:41: warning: ‘a’ may be used uninitialized in this function [-Wmaybe-uninitialized] fout << a << " " << 1 << '\n'; ^ user.cpp:377:41: warning: ‘b’ may be used uninitialized in this function [-Wmaybe-uninitialized] fout << b << " " << 1 << '\n'; ^ user.cpp:378:53: warning: ‘d’ may be used uninitialized in this function [-Wmaybe-uninitialized] fout << 1 << " " << d << '\n'; ^ user.cpp:369:57: warning: ‘c’ may be used uninitialized in this function [-Wmaybe-uninitialized] fout << 1 << " " << c << '\n'; ^