Compilare: user.cpp: In member function ‘void BigNumber33554432::add_value(int)’: user.cpp:23:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (container.size() == i + 1) ^ user.cpp: In member function ‘void BigNumber33554432::multiplyBy(int)’: user.cpp:32:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < container.size(); i++) ^ user.cpp: In constructor ‘BigNumber33554432::BigNumber33554432(std::string)’: user.cpp:53:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < s.length(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:76:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < bn.container.size(); i++) ^ user.cpp:68:9: warning: unused variable ‘x’ [-Wunused-variable] int n, x; ^