Compilare: user.cpp: In constructor ‘Reader::Reader(const char*)’: user.cpp:19:38: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer, BUFFER_SIZE, 1, file); ^ user.cpp: In member function ‘void Reader::advance()’: user.cpp:44:39: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer, BUFFER_SIZE, 1, file); ^ user.cpp: In function ‘int main()’: user.cpp:125:19: warning: ‘_where’ may be used uninitialized in this function [-Wmaybe-uninitialized] for (j = _where - 1; j >= 0; --j) { ^