Compilare: user.cpp: In function ‘int main()’: user.cpp:44:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (indice <s.size()) ^ user.cpp:51:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (indice == s.length() - 1) ^ user.cpp:60:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (indice < s.size()) ^ user.cpp:67:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (indice == s.length() - 1) ^ user.cpp:76:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (indice < s.size()) ^ user.cpp:83:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (indice == s.length() - 1) ^ user.cpp:92:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (indice < s.size()) ^