Compilare: user.cpp: In function ‘int main()’: user.cpp:37:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i != s->size() - 1) ^ user.cpp:42:48: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (s->at(i) != '"' && i != s->size() - 1) ^ user.cpp:57:48: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (s->at(i) != '"' && i != s->size() - 1) ^ user.cpp:60:48: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (s->at(i) != '"' && i != s->size() - 1) ^ user.cpp:73:86: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (s->at(i) != '"' && (s->at(i) < '0' || s->at(i) > '9') && i != s->size() - 1) ^ user.cpp:95:68: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (s->at(i) >= '0' && s->at(i) <= '9' && i != s->size() - 1) ^