Compilare: user.cpp: In member function ‘void Number::prepare(int)’: user.cpp:69:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<fact.size(); ++i) ^ user.cpp: In member function ‘int Number::number()’: user.cpp:81:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<fact.size(); ++i) ^ user.cpp: In member function ‘Number Number::operator*(int)’: user.cpp:89:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<fact.size(); ++i) ^ user.cpp: In member function ‘Number Number::operator/(int)’: user.cpp:103:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<fact.size(); ++i) ^