Compilare: user.cpp:9:6: warning: ISO C++ forbids declaration of ‘main’ with no type [-Wreturn-type] main() ^ user.cpp: In function ‘int main()’: user.cpp:37:27: warning: ‘u’ may be used uninitialized in this function [-Wmaybe-uninitialized] fo<<sum<<" "<<p<<" "<<u<<endl; ^ user.cpp:37:19: warning: ‘p’ may be used uninitialized in this function [-Wmaybe-uninitialized] fo<<sum<<" "<<p<<" "<<u<<endl; ^