Compilare: user.cpp: In member function ‘bic::big_int& bic::big_int::operator/=(const bic::big_int&)’: user.cpp:42:5: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘const bic::big_int bic::operator*(const bic::big_int&, const bic::big_int&)’: user.cpp:60:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0, j, t; i < lhs._d.size(); ++i) { ^ user.cpp:61:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0, t = 0; j < rhs._d.size() || t; ++j, t /= big_int::BASE) { ^ user.cpp:63:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (j < rhs._d.size()) t += lhs._d[i] * rhs._d[j]; ^