Compilare: user.cpp: In member function ‘void reader::next()’: user.cpp:17:39: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread( buff, SIZE, 1, in ); ^ user.cpp: In constructor ‘reader::reader(const char*)’: user.cpp:27:35: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread( buff, SIZE, 1, in ); ^