Compilare: main.cpp: In member function 'void Bignumber::normalize()': main.cpp:29:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(ptr < v.size()){ ~~~~^~~~~~~~~~ main.cpp:30:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(ptr + 1 == v.size() && base <= v[ptr]) ~~~~~~~~^~~~~~~~~~~ main.cpp: In member function 'Bignumber Bignumber::operator+(const Bignumber&) const': main.cpp:46:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < a.v.size(); i++) ~~^~~~~~~~~~~~ main.cpp: In member function 'Bignumber Bignumber::operator*(const int&) const': main.cpp:55:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v.size(); i++) ~~^~~~~~~~~~ main.cpp: In member function 'std::__cxx11::string Bignumber::format()': main.cpp:70:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i < v.size() - 1) ~~^~~~~~~~~~~~~~