Compilare: user.cpp: In function ‘int main()’: user.cpp:34:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<word.size(); ++i){ ^ user.cpp:49:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<word.size(); ++i){ ^ user.cpp:68:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<word.size(); ++i){ ^ user.cpp:72:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i != word.size() - 1) ^ user.cpp:77:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<word.size(); ++i){ ^