Compilare: main.cpp: In member function 'BigInt BigInt::operator+(const BigInt&) const': main.cpp:37:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i <= ans.data[0]; ++i) { ~~^~~~~~~~~~~~~~ main.cpp:40:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i <= this->data[0]) ~~^~~~~~~~~~~~~~~~ main.cpp:43:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i <= other.data[0]) ~~^~~~~~~~~~~~~~~~