Compilare: user.cpp: In function ‘int main()’: user.cpp:96:14: warning: array subscript has type ‘char’ [-Wchar-subscripts] x[++ x[0]] = c + '0'; ^ user.cpp: In constructor ‘ReadStream::ReadStream(const char*)’: user.cpp:29:30: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buf, maxSize, 1, f); ^ user.cpp: In member function ‘void ReadStream::move()’: user.cpp:18:32: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buf, maxSize, 1, f); ^