HCLTech Systems Software Engineer interview questions

The first thing every company does is an apptitude test but HCL has conducted technical test. After which they give a question of linked list, once completed will be diverted to an interviewer room. The person sitting took my sheet in which there is an answer for the linked list question is on that and looking into that he started asking questions on the basic concepts of OS, data structures and c language. And finally the HR process continues.