Compilare: user.cpp: In function ‘void parsekeys(std::string, std::ofstream&)’: user.cpp:8:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<s.size();i++) { ^ user.cpp:21:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i == string::npos) ^ user.cpp: In function ‘void parsevalues(std::string, std::ofstream&)’: user.cpp:29:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<s.size();i++) { ^