Compilare: user.cpp: In member function ‘void HugeNumber::operator+=(const HugeNumber&)’: user.cpp:49:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < number.size() || i < rhs.number.size() || t; ++i, t /= 10) ^ user.cpp:49:62: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < number.size() || i < rhs.number.size() || t; ++i, t /= 10) ^ user.cpp:50:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] res[i] = (t += ((i < number.size()) ? (number[i]) : (0)) + ((i < rhs.number.size()) ? (rhs.number[i]) : (0))) % 10; ^ user.cpp:50:94: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] res[i] = (t += ((i < number.size()) ? (number[i]) : (0)) + ((i < rhs.number.size()) ? (rhs.number[i]) : (0))) % 10; ^