Compilare: user.cpp: In member function ‘BigNumber BigNumber::operator+(const BigNumber&)’: user.cpp:40:41: 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:40:93: 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:60:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < _container.size(); i++) ^ user.cpp:62:73: 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 ‘BigNumber BigNumber::operator*(const BigNumber&)’: user.cpp:87:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < min.size(); i++) ^ user.cpp:95:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < max.size(); j++) ^ user.cpp: In member function ‘int BigNumber::to_int()’: user.cpp:160:7: warning: unused variable ‘p’ [-Wunused-variable] int p = 0; ^