Compilare: user.cpp: In member function ‘void Reader::advance()’: user.cpp:13:38: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buf, SIZE, 1, file); ^ user.cpp: In constructor ‘Reader::Reader(const char*)’: user.cpp:25:34: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buf, SIZE, 1, file); ^