Compilare: main.cpp: In member function 'Bignum Bignum::operator+(const Bignum&)': main.cpp:57:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] c = (mx == d.size()) ? d : other.d; ~~~^~~~~~~~~~~ main.cpp:60:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i < d.size()) r += d[i]; ~~^~~~~~~~~~ main.cpp:61:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i < other.d.size()) r += other.d[i]; ~~^~~~~~~~~~~~~~~~ main.cpp: In member function 'Bignum Bignum::operator*(const Bignum&)': main.cpp:82:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < c.size(); i++) { ~~^~~~~~~~~~