Compilare: user.cpp: In function ‘int main()’: user.cpp:127:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < Arb.size() ; ++ i) ^ user.cpp: In member function ‘char Scanner::next()’: user.cpp:61:51: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer_, 1, buffer_size_, file_); ^