Compilare: user.cpp: In function ‘int main()’: user.cpp:17:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<s.size(); i++){ ^ user.cpp:19:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i==s.size()) break; ^ user.cpp:20:29: warning: ‘ok’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(!isalpha(s[i+1]) && ok) words++, ok= false; ^