Compilare: user.cpp:25:39: warning: invalid suffix on literal; C++11 requires a space between literal and identifier [-Wliteral-suffix] while(s[i]==' ' or (s[i]>='0'and s[i]<='9')) ^ user.cpp: In function ‘int main()’: user.cpp:20:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i <=s.length(); i++) ^ user.cpp:41:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < s.length(); i++) ^ user.cpp:42:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (sep.find(s[i]) != -1) ^