antic.cpp: In function 'bool Compare(std::string, std::string)': antic.cpp:15: warning: comparison between signed and unsigned integer expressions antic.cpp: In member function 'bool String::operator<(const String&) const': antic.cpp:31: warning: comparison between signed and unsigned integer expressions antic.cpp:31: warning: comparison between signed and unsigned integer expressions antic.cpp: In function 'int main()': antic.cpp:62: warning: comparison between signed and unsigned integer expressions antic.cpp: In function 'bool Compare(std::string, std::string)': antic.cpp:22: warning: control reaches end of non-void function