Compilare: user.cpp: In function ‘int position(std::string, char)’: user.cpp:10:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < words.length(); i++) ^ user.cpp: In function ‘int correct(std::string&, int&, int&)’: user.cpp:22:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < words.length(); i++){ ^ user.cpp: In function ‘int swaps(std::string)’: user.cpp:52:60: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(pos_odd_char != -1 && pos_odd_char < words.length() / 2) ^ user.cpp:55:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int left = 0; left < words.length() / 2; left++){ ^