Compilare: user.cpp: In member function ‘OuputWriter& OuputWriter::operator<<(const char&)’: user.cpp:83:5: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In member function ‘void InputReader::advance()’: user.cpp:39:39: 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, SIZE, in); ^ user.cpp: In constructor ‘InputReader::InputReader(const char*)’: user.cpp:12:35: 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, SIZE, in); ^