Compilare: user.cpp: In member function ‘BigNumber BigNumber::operator+(const BigNumber&)’: user.cpp:36:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] int addResult = (i < _container.size() ? _container[i] : 0) + (i < other._container.size() ? other._container[i] : 0); ^ user.cpp:36:93: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] int addResult = (i < _container.size() ? _container[i] : 0) + (i < other._container.size() ? other._container[i] : 0); ^ user.cpp: In member function ‘BigNumber BigNumber::operator-(const BigNumber&)’: user.cpp:56:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < _container.size(); i++) ^ user.cpp:58:73: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] int subResult = (_container[i] - carry) - (i < other._container.size() ? other._container[i] : 0); ^ user.cpp: In member function ‘int BigNumber::to_int()’: user.cpp:126:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < _container.size(); i++) ^